Artykuły w czasopismach: „Telecom frequency”

1

De, Syamsundar, Ghaya Baili, Mehdi Alouini, Jean-Christophe Harmand, Sophie Bouchoule i Fabien Bretenaker. "Class-A dual-frequency VECSEL at telecom wavelength". Optics Letters 39, nr 19 (22.09.2014): 5586. http://dx.doi.org/10.1364/ol.39.005586.

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Jabir, M. V., N. Fajar R. Annafianto, I. A. Burenkov, M. Dagenais, A. Battou i S. V. Polyakov. "Versatile quantum-enabled telecom receiver". AVS Quantum Science 5, nr 1 (marzec 2023): 015001. http://dx.doi.org/10.1116/5.0123880.

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We experimentally demonstrate a quantum-measurement-based receiver for a range of modulation schemes and alphabet lengths in a telecom C-band. We attain symbol error rates below the shot noise limit for all the studied modulation schemes and the alphabet lengths [Formula: see text]. In doing so, we achieve the record energy sensitivity for telecom receivers. We investigate the trade-off between energy and bandwidth use and its dependence on the alphabet length. We identify the combined (energy and bandwidth) resource efficiency as a figure of merit and experimentally confirm that the quantum-inspired hybrid frequency/phase encoding has the highest combined resource efficiency.

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Yashuai Han, Yashuai Han, Shanlong Guo Shanlong Guo, Jie Wang Jie Wang, Huifeng Liu Huifeng Liu, Jun He Jun He i Junmin Wang Junmin Wang. "Efficient frequency doubling of a telecom 1560 nm laser in a waveguide and frequency stabilization to Rb D2 line". Chinese Optics Letters 12, nr 12 (2014): 121401–3. http://dx.doi.org/10.3788/col201412.121401.

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White, Jim. "Use of, and limits to telecommunications supporting Spill Response in the Arctic". International Oil Spill Conference Proceedings 2014, nr 1 (1.05.2014): 281407. http://dx.doi.org/10.7901/2169-3358-2014-1-281407.1.

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The ability to exchange critical information across a broad spectrum of users is the success of a response. Communicating on the North Slope of Alaska is a technical challenge. One of the most critical elements supporting any Contingency Response is telecommunications (telecom). Telecom, as an issue rears its head after almost every exercise or real world response situation. It never seems to matter what type of event the response is supporting, the location of the response or weather that is occurring. Telecom continues to come up as a 'lessons learned'. Recent technological advances (Last 15–20 Years) have resolved some older, yet lingering issues, (e.g. SATCOM, Fiber Optics, Digitization, and the Internet). That said, trying to communicate over an area covering tens-of-thousands of square miles in some of the harshest, most remote regions on the planet is at the very least - demanding. Technically, in many regions, telecom issues can be fairly easy to resolve. In the Arctic, several factors as well as weather play a major part in our ability to respond to an incident. Many areas are not accessible on a road system. Ice roads provide seasonal, temporary access. When ice roads are not available then various aircraft can be utilized. Some sites may only be accessible via specialized vehicles treading lightly on the tundra or that displace the tons of equipment over a broad area for frozen pond, lake and river crossings, minimizing environmental impact. To meet the challenge of Spill Response on the North Slope of Alaska, Alaska Clean Seas and its member companies have developed and employ a network of Very High Frequency (VHF), Ultra-High Frequency (UHF), Cellular, Microwave, and SATellite COMmunications (SATCOM) Systems. A recent Federal Communications Commission directive to reduce bandwidth usage forced the modernization of Alaska's Oil Spill Response Network. The nationwide requirement enables the same number of users to occupy half the frequency spectrum. Alaska is unique in that the entire State's Oil Spill Response Network shares the same frequencies and compatible equipment. This enables the cooperatives to seamlessly support each another. One of the obvious reasons that telecom becomes an issue is non-standardized exchange of ideas, recommendations, or commands. User unfamiliarity with telecom devices (radios, speaker microphones) also contributes to communication barriers. Use of jargon, ten codes and often cultural references can inhibit needed messages from being received as expected. This can easily be improved through Incident Command System training

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Zayed, Nurul Mohammad, Friday Ogbu Edeh, Khan Mohammad Anwarul Islam, Vitalii Nitsenko, Tetiana Dubovyk i Hanna Doroshuk. "An Investigation into the Effect of Knowledge Management on Employee Retention in the Telecom Sector". Administrative Sciences 12, nr 4 (17.10.2022): 138. http://dx.doi.org/10.3390/admsci12040138.

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Employees in the telecom sector are knowledge workers and, thus, managers, HR professionals, and policymakers in the industry need to retain them through knowledge management policies. It is against this premise that this study investigated the effect of knowledge management on employee retention in the telecom sector. Research design employed in this study is a cross-sectional survey with an accessible population of thirty telecom companies in the southeastern region of Nigeria using a simple random sampling technique. The sample size was determined with the Krejcie and Morgan sample size determination table. A questionnaire was used as an instrument for data collection. Respondents’ profiles were analysed with frequency distribution while the formulated hypotheses were analysed with linear regression. The study found that knowledge management dimensions have a significant effect on the measures of employee retention. The study concludes that knowledge management measured in terms of knowledge acquisition, knowledge storage, and knowledge sharing predicted employee retention that is measured by supervisor support, coworkers support, and flexible working arrangements. One of the implications of this study is that managers of telecom companies should liaise with their board of directors to make funds available that would be used to train employees to acquire relevant knowledge that is needed in the telecom industry.

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Cherfan, Charbel, Maxime Denis, Denis Bacquet, Michel Gamot, Samir Zemmouri, Isam Manai, Jean-François Clément, Jean-Claude Garreau, Pascal Szriftgiser i Radu Chicireanu. "Multi-frequency telecom fibered laser system for potassium laser cooling". Applied Physics Letters 119, nr 20 (15.11.2021): 204001. http://dx.doi.org/10.1063/5.0070646.

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Fofanov, D. A., T. N. Bakhvalova, A. V. Alyoshin, M. E. Belkin i A. S. Sigov. "Microwave-Photonics Frequency Up-Converter for Telecom and Measurement Equipment". IOP Conference Series: Materials Science and Engineering 524 (28.05.2019): 012006. http://dx.doi.org/10.1088/1757-899x/524/1/012006.

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Di Francescantonio, Agostino, Attilio Zilli, Davide Rocco, Fabrizio Conti, Aristide Lemaître, Paolo Biagioni, Lamberto Duò i in. "Coherent all-optical steering of upconverted light by a nonlinear metasurface". EPJ Web of Conferences 287 (2023): 04009. http://dx.doi.org/10.1051/epjconf/202328704009.

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In recent years a strong drive towards the miniaturization of nonlinear optics has been motivated by the functionalities it could empower in integrated devices. Among these, the upconversion of near-infrared photons to the visible and their manipulation is fundamental to downscale optical information. We propose a dual-beam scheme whereby a pulse at the telecom frequency ω (1550 nm wavelength) is mixed with its frequency-doubled replica at 2ω. When the two pump pulses are superimposed on a nonlinear, all-dielectric metasurface two coherent frequency-tripling pathways are excited: third-harmonic generation (THG, ω+ω+ω) and sum-frequency generation (SFG, ω+2ω). Their coherent superposition at 3ω produces interference, which we enable by filtering the k-space with the metasurface diffraction. The steering of the emission among diffraction orders, is sensitive to the relative phase between the two pumps. Therefore, by exploiting the phase as a tuning knob, the upconverted signal can be switched between diffraction orders with an efficiency >90%. The proposed approach can be envisioned as an all-optical method to reroute upconverted telecom photons.

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Heggde, Githa. "Strategies for Sustainable Channel Relations in Mobile Telecom Sector". Journal of Economics and Behavioral Studies 1, nr 1 (15.01.2011): 7–18. http://dx.doi.org/10.22610/jebs.v1i1.216.

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The telecom sector in India largely comprises of wireless connections for phones. As of today, there are approximately 21 network providers in the country with about 7 per each circle, each offering competitive pricing to the consumers. The main objective of the study is to provide an accurate role for the company executive in developing channel relations. Further to this, the study explores the strategies which can sustain a good working relationship between the company and its channel members in the mobile telecom sector. The constructs identified for developing sustainable relationships were Setting distribution objectives, Channel design, Logistics, Image Building, Inventory management, Channel management, Payment & credit, Promotional assistance, Setting targets, Coverage frequency , Motivating channel members to perform. The sample selected contained distributors from the Mobile telecom sector and company executives/channel managers of leading telecom companies. Factor analysis and Friedmanâ€™s test was applied. The findings revealed a correlation in attitude between distributors and the executives. Motivating distributors was rated as the most important strategy by the company. The distributors felt that all channel partners needed to have positive attitude towards the channel while company executives felt that aggression made channel members perform effectively. Such findings will be of use to mobile telecom companies who are new entrants to the Indian market and to existing companies who plan to expand their coverage.

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Guo, Yuan, Wei Zhang, Shuai Dong, Yidong Huang i Jiangde Peng. "Telecom-band degenerate-frequency photon pair generation in silicon microring cavities". Optics Letters 39, nr 8 (15.04.2014): 2526. http://dx.doi.org/10.1364/ol.39.002526.

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Almat, Nil, Matthieu Pellaton, William Moreno, Florian Gruet, Christoph Affolderbach i Gaetano Mileti. "Rb vapor-cell clock demonstration with a frequency-doubled telecom laser". Applied Optics 57, nr 16 (1.06.2018): 4707. http://dx.doi.org/10.1364/ao.57.004707.

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De Greve, Kristiaan, Leo Yu, Peter L. McMahon, Jason S. Pelc, Chandra M. Natarajan, Na Young Kim, Eisuke Abe i in. "Quantum-dot spin–photon entanglement via frequency downconversion to telecom wavelength". Nature 491, nr 7424 (listopad 2012): 421–25. http://dx.doi.org/10.1038/nature11577.

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Li, Chunlei, Dawei Qi, Yuxiao Wang i Xueru Zhang. "Wideband slow light based on plasmon-induced transparency at telecom frequency". Optics Communications 351 (wrzesień 2015): 26–29. http://dx.doi.org/10.1016/j.optcom.2015.04.036.

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Chen, Jun, Kim Fook Lee, Chuang Liang i Prem Kumar. "Fiber-based telecom-band degenerate-frequency source of entangled photon pairs". Optics Letters 31, nr 18 (25.08.2006): 2798. http://dx.doi.org/10.1364/ol.31.002798.

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Stankevičius, Evaldas. "LTE FDD AND SRD EQUIPMENT COMPATIBILITY IN 2500 MHZ BAND / LTE FDD IR SRD ĮRENGINIŲ SUDERINAMUMAS 2500 MHZ RUOŽE". Mokslas – Lietuvos ateitis 6, nr 2 (24.04.2014): 206–10. http://dx.doi.org/10.3846/mla.2014.31.

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This paper examines the LTE mobile communication base stations possible interfering effects on short range communication devices operating in ISM frequency band. LTE network is running in 2500–2690 MHz frequency band, where frequency channel distribution is used. Downlink channels are assigned to base stations and formed in 2620–2680 MHz band, uplink channels are assigned to mobile stations and formed in 2500–2560 MHz band. Short range communication devices operate in 2400–2483.5 MHz frequency range. The main problem of this study – the interference probability and magnitude. Real equipment was simulated using two different modelling software systems for investigation of electromagnetic compatibility: ICS Telecom and Seamcat. The modelling results show that LTE BS have minimum or no impact on operation of short range communication devices in ISM frequency band. Nagrinėjamas LTE mobiliojo ryšio bazinių stočių galimas interferencinis poveikis nedidelio veikimo nuotolio įrenginiams. LTE tinklas veikia 2500–2690 MHz dažnių ruože, naudojamas dažninis kanalų dalijimas. Žemynkrypčiai kanalai, priskiriami bazinėms stotims, formuojami 2620–2680 MHz ruože, aukštynkrypčiai kanalai, priskiriami mobiliosioms stotims, formuojami 2500–2560 MHz ruože. Trumpojo veikimo nuotolio įrenginiai veikia 2400–2483,5 MHz dažnių ruože. Pagrindinė šio tyrimo problema – galima interferencija ir jos mastas. Realus įrenginių veikimas modeliuojamas dviejomis skirtingomis programomis, kurios skirtos elektromagnetiniam suderinamumui tirti: ICS Telecom ir Seamcat.

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Fang Pengcheng, 方鹏程, 蔡桢荻 Cai Zhendi, 孙焕尧 Sun Huanyao, 王艳 Wang Yan, 徐晏琪 Xu Yanqi i 陈群峰 Chen Qunfeng. "60 km实地光纤链路光频传输". Acta Optica Sinica 42, nr 23 (2022): 2306006. http://dx.doi.org/10.3788/aos202242.2306006.

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Wudu, Asemahegn, Daniel Rozban i Amir Abramovich. "QPSK MMW Wireless Communication System Based On p-i-n InGaAs Photomixer". Electronics 9, nr 8 (22.07.2020): 1182. http://dx.doi.org/10.3390/electronics9081182.

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Millimeter-wave (MMW) frequencies (30–300 GHz), located between the microwave and infrared (IR), are promising solutions for the increasing demand of high data rate applications, UHD multimedia, HD gaming, security, surveillance, and the emergence of 5G Internet of Things (IoT). In this article, we experimentally demonstrated MMW wireless communication link using InGaAs p-i-n photomixer and commercially available telecom components at W-band (75–110 GHz). The photomixer was excited by two 1.5 µm lasers via standard telecom fiber optics, to generate frequency difference at W-band. QPSK modulated signal transmitted by the photomixer and received horn antenna integrated MMW mixer and analyzed using a spectrum analyzer and Vector Signal Analyzer (VSA) software.

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Zabkowski, Tomasz S. "RFM approach for telecom insolvency modeling". Kybernetes 45, nr 5 (3.05.2016): 815–27. http://dx.doi.org/10.1108/k-04-2015-0113.

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Purpose – The purpose of this paper is to present application of recency, frequency and monetary value (RFM) approach to predict customer insolvency using telecommunication data corresponding to RFM of late payments. The study tackles a serious problem that telecommunication companies often face and shows the ways to deal with it. Design/methodology/approach – Based on a real telecom customer data, RFM approach was tested against decision trees and logistic regression models. Proposed models were evaluated with lift measure, area under the receiver operating characteristic and the ability to detect significant amount of money owed by insolvent customers. Findings – The main findings from the research are twofold: RFM approach offers a viable alternative for customer insolvency classification. The proposed models perform well and all of them can capture significant amount of money owed by insolvent customers what is of high importance for the revenue assurance. Originality/value – In comparison to previous studies proposed research presents novelty in the following areas. First, it deals with RFM applied to insolvency data (previous studies dealt with direct marketing data). Second, with these three variables it is possible to act as an early warning system for predicting the risk level and probable anomalies as quickly as it is possible (data retrieval and computational time is reduced). Third, RFM approach was tested against decision trees and logistic regression and the quality of the models was also assessed three months after the estimation.

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Yin, Zhenghao, Kenta Sugiura, Hideaki Takashima, Ryo Okamoto, Feng Qiu, Shiyoshi Yokoyama i Shigeki Takeuchi. "Frequency correlated photon generation at telecom band using silicon nitride ring cavities". Optics Express 29, nr 4 (1.02.2021): 4821. http://dx.doi.org/10.1364/oe.416165.

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Morrison, Christopher L., Markus Rambach, Zhe Xian Koong, Francesco Graffitti, Fiona Thorburn, Ajoy K. Kar, Yong Ma i in. "A bright source of telecom single photons based on quantum frequency conversion". Applied Physics Letters 118, nr 17 (26.04.2021): 174003. http://dx.doi.org/10.1063/5.0045413.

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Gyger, Samuel, Katharina D. Zeuner, Klaus D. Jöns, Ali W. Elshaari, Matthias Paul, Sergei Popov, Carl Reuterskiöld Hedlund, Mattias Hammar, Oskars Ozolins i Val Zwiller. "Reconfigurable frequency coding of triggered single photons in the telecom C–band". Optics Express 27, nr 10 (3.05.2019): 14400. http://dx.doi.org/10.1364/oe.27.014400.

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Lu, Xiyuan, Gregory Moille, Ashutosh Rao i Kartik Srinivasan. "Proposal for noise-free visible-telecom quantum frequency conversion through third-order sum and difference frequency generation". Optics Letters 46, nr 2 (5.01.2021): 222. http://dx.doi.org/10.1364/ol.412602.

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Liu, Hui, Gregory Gredat, Syamsundar De, Ihsan Fsaifes, Aliou Ly, Rémy Vatré, Ghaya Baili, Sophie Bouchoule, Fabienne Goldfarb i Fabien Bretenaker. "Ultra-low noise dual-frequency VECSEL at telecom wavelength using fully correlated pumping". Optics Letters 43, nr 8 (11.04.2018): 1794. http://dx.doi.org/10.1364/ol.43.001794.

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Theron, Fabien, Yannick Bidel, Emily Dieu, Nassim Zahzam, Malo Cadoret i Alexandre Bresson. "Frequency-doubled telecom fiber laser for a cold atom interferometer using optical lattices". Optics Communications 393 (czerwiec 2017): 152–55. http://dx.doi.org/10.1016/j.optcom.2017.02.013.

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Nasir, M. E., S. Peruch, N. Vasilantonakis, W. P. Wardley, W. Dickson, G. A. Wurtz i A. V. Zayats. "Tuning the effective plasma frequency of nanorod metamaterials from visible to telecom wavelengths". Applied Physics Letters 107, nr 12 (21.09.2015): 121110. http://dx.doi.org/10.1063/1.4931687.

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He, Yabai, Kenneth G. H. Baldwin, Brian J. Orr, R. Bruce Warrington, Michael J. Wouters, Andre N. Luiten, Peter Mirtschin i in. "Long-distance telecom-fiber transfer of a radio-frequency reference for radio astronomy". Optica 5, nr 2 (1.02.2018): 138. http://dx.doi.org/10.1364/optica.5.000138.

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Truchet, Didier. "Glossaire juridique". Revue française d'administration publique 52, nr 1 (1989): 53–64. http://dx.doi.org/10.3406/rfap.1989.2283.

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Legal Glossary Didier Truchet A brief legal definition is provided for such terms as : authorization (and notification) ; disputes over telephone charges ; France-Telecom ; frequency ; specialized links ; monopoly (and competition) ; normalisation (and technical Controls) ; privatization ; regulations, value-added network (telematics network open to third parties) ; cable network ; digital integrated service network ; liability ; satellite ; public service ; private electric radio station ; telecommunication (and audiovisual communication) ; telematics ; user.

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van Leent, Tim, Matthias Bock, Florian Fertig, Robert Garthoff, Sebastian Eppelt, Yiru Zhou, Pooja Malik i in. "Entangling single atoms over 33 km telecom fibre". Nature 607, nr 7917 (6.07.2022): 69–73. http://dx.doi.org/10.1038/s41586-022-04764-4.

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AbstractQuantum networks promise to provide the infrastructure for many disruptive applications, such as efficient long-distance quantum communication and distributed quantum computing1,2. Central to these networks is the ability to distribute entanglement between distant nodes using photonic channels. Initially developed for quantum teleportation3,4 and loophole-free tests of Bell’s inequality5,6, recently, entanglement distribution has also been achieved over telecom fibres and analysed retrospectively7,8. Yet, to fully use entanglement over long-distance quantum network links it is mandatory to know it is available at the nodes before the entangled state decays. Here we demonstrate heralded entanglement between two independently trapped single rubidium atoms generated over fibre links with a length up to 33 km. For this, we generate atom–photon entanglement in two nodes located in buildings 400 m line-of-sight apart and to overcome high-attenuation losses in the fibres convert the photons to telecom wavelength using polarization-preserving quantum frequency conversion9. The long fibres guide the photons to a Bell-state measurement setup in which a successful photonic projection measurement heralds the entanglement of the atoms10. Our results show the feasibility of entanglement distribution over telecom fibre links useful, for example, for device-independent quantum key distribution11–13 and quantum repeater protocols. The presented work represents an important step towards the realization of large-scale quantum network links.

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Batenkov, Kirill. "Analysing non-linearity parameters and phase relationship of telecom-munication network analog-output terminations". Automation and modeling in design and management 2022, nr 4 (21.12.2022): 4–11. http://dx.doi.org/10.30987/2658-6436-2022-4-4-11.

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The main calculation ratios for the characteristics of nonlinearity are presented: amplitude characteristic, dynamic range and coefficients of nonlinear distortions (harmonic coefficients). The examples show the order of their calculation and analysis. The article indicates that due to the diversity of reception and transmission of multi-channel transfer systems measuring the phase-frequency characteristic is extremely difficult. As a result, approaches to normalising the group transmission time are proposed. The article presents that the value deviation of the group signal transmission time in the channel from the value measured at a frequency of 1.9 kHz in a simple voice frequency channel is normalised, as well as the relative group transmission time regarding the minimum value for various types of endings built on the basis of digital transmission systems

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Yao, Yuan, Yanyi Jiang, Hongfu Yu, Zhiyi Bi i Longsheng Ma. "Optical frequency divider with division uncertainty at the 10−21 level". National Science Review 3, nr 4 (26.09.2016): 463–69. http://dx.doi.org/10.1093/nsr/nww063.

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Abstract Optical clocks with unprecedented accuracy of 10−18 promise innovations in many research areas. Their applications rely to a large extent on the ability of precisely converting the frequency from one optical clock to another, or particularly to the frequencies in the fiber telecom band for long-distance transmission. This report demonstrates a low-noise, high-precision optical frequency divider, which realizes accurate optical frequency conversion and enables precise measurement of optical frequency ratios. By measuring against the frequency ratio between the fundamental and the second harmonic of a 1064-nm laser instead of a second copy of the same system, we demonstrate that the optical frequency divider has a fractional frequency division instability of 6 × 10−19 at 1 s and a fractional frequency division uncertainty of 1.4 × 10−21. The remarkable numbers can support frequency division of the best optical clocks in the world without frequency-conversion-caused degradation of their performance.

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Stern, Liron, Jordan R. Stone, Songbai Kang, Daniel C. Cole, Myoung-Gyun Suh, Connor Fredrick, Zachary Newman i in. "Direct Kerr frequency comb atomic spectroscopy and stabilization". Science Advances 6, nr 9 (luty 2020): eaax6230. http://dx.doi.org/10.1126/sciadv.aax6230.

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Microresonator-based soliton frequency combs, microcombs, have recently emerged to offer low-noise, photonic-chip sources for applications, spanning from timekeeping to optical-frequency synthesis and ranging. Broad optical bandwidth, brightness, coherence, and frequency stability have made frequency combs important to directly probe atoms and molecules, especially in trace gas detection, multiphoton light-atom interactions, and spectroscopy in the extreme ultraviolet. Here, we explore direct microcomb atomic spectroscopy, using a cascaded, two-photon 1529-nm atomic transition in a rubidium micromachined cell. Fine and simultaneous repetition rate and carrier-envelope offset frequency control of the soliton enables direct sub-Doppler and hyperfine spectroscopy. Moreover, the entire set of microcomb modes are stabilized to this atomic transition, yielding absolute optical-frequency fluctuations at the kilohertz level over a few seconds and <1-MHz day-to-day accuracy. Our work demonstrates direct atomic spectroscopy with Kerr microcombs and provides an atomic-stabilized microcomb laser source, operating across the telecom band for sensing, dimensional metrology, and communication.

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Kuyken, B., F. Leo, S. Clemmen, U. Dave, R. Van Laer, T. Ideguchi, H. Zhao i in. "Nonlinear optical interactions in silicon waveguides". Nanophotonics 6, nr 2 (1.03.2017): 377–92. http://dx.doi.org/10.1515/nanoph-2016-0001.

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AbstractThe strong nonlinear response of silicon photonic nanowire waveguides allows for the integration of nonlinear optical functions on a chip. However, the detrimental nonlinear optical absorption in silicon at telecom wavelengths limits the efficiency of many such experiments. In this review, several approaches are proposed and demonstrated to overcome this fundamental issue. By using the proposed methods, we demonstrate amongst others supercontinuum generation, frequency comb generation, a parametric optical amplifier, and a parametric optical oscillator.

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Knaut, C. M., A. Suleymanzade, Y. C. Wei, D. R. Assumpcao, P. J. Stas, Y. Q. Huan, B. Machielse i in. "Entanglement of nanophotonic quantum memory nodes in a telecom network". Nature 629, nr 8012 (15.05.2024): 573–78. http://dx.doi.org/10.1038/s41586-024-07252-z.

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AbstractA key challenge in realizing practical quantum networks for long-distance quantum communication involves robust entanglement between quantum memory nodes connected by fibre optical infrastructure1–3. Here we demonstrate a two-node quantum network composed of multi-qubit registers based on silicon-vacancy (SiV) centres in nanophotonic diamond cavities integrated with a telecommunication fibre network. Remote entanglement is generated by the cavity-enhanced interactions between the electron spin qubits of the SiVs and optical photons. Serial, heralded spin-photon entangling gate operations with time-bin qubits are used for robust entanglement of separated nodes. Long-lived nuclear spin qubits are used to provide second-long entanglement storage and integrated error detection. By integrating efficient bidirectional quantum frequency conversion of photonic communication qubits to telecommunication frequencies (1,350 nm), we demonstrate the entanglement of two nuclear spin memories through 40 km spools of low-loss fibre and a 35-km long fibre loop deployed in the Boston area urban environment, representing an enabling step towards practical quantum repeaters and large-scale quantum networks.

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Kroh, Tim, Andreas Ahlrichs, Benjamin Sprenger i Oliver Benson. "Heralded wave packet manipulation and storage of a frequency-converted pair photon at telecom wavelength". Quantum Science and Technology 2, nr 3 (12.07.2017): 034007. http://dx.doi.org/10.1088/2058-9565/aa736c.

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Hou, Jie, i Baizhou Li. "The Evolutionary Game for Collaborative Innovation of the IoT Industry under Government Leadership in China: An IoT Infrastructure Perspective". Sustainability 12, nr 9 (1.05.2020): 3648. http://dx.doi.org/10.3390/su12093648.

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Since the United States, the European Union, China, and other countries put forward the development strategy of Internet of Things (IoT), it has been growing rapidly, leading to industrial restructuring and the sustainable development of various industries. Not only can collaborative innovation of the IoT industry accelerate R&D efficiency and product substitution frequency of IoT infrastructure, but also it can promote the construction of smart cities, the application of Big Data and Cloud Computing, and the development of 5G. In China, government is a leader and initiator of IoT infrastructure deployment. Therefore, in this paper, we construct an evolutionary game model of the IoT industry under government leadership represented by government, telecom equipment manufacturers, and telecom operators. Then, we analyze the asymptotic stability, equilibrium stability, and evolutionary stability strategy of the model. Finally, we carry out numerical simulation to investigate the effect of eight factors and four mechanisms on evolutionary behaviors of the three parties. The results show each factor has a different influence on them. Evolutionary game model offers ideas for government and industry subjects before the collaborative innovation of IoT infrastructure deployment in practice.

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Roiz, Mikhail, Jui-Yu Lai, Juho Karhu i Markku Vainio. "Efficient carrier-envelope phase tunable mid-infrared frequency combs based on CW-seeded optical parametric generation". EPJ Web of Conferences 255 (2021): 11002. http://dx.doi.org/10.1051/epjconf/202125511002.

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We present an efficient method for generating frequency combs in the mid-infrared (MIR) spectral range in bulk lithium niobate crystals as well as in waveguides. Our approach is simple and robust, since it is based on single-pass configuration of femtosecond Optical Parametric Generation (OPG) seeded by a telecom continuous-wave laser. Precise and fast tuning of the seed laser allows to rapidly change the offset frequency of the generated MIR comb independent of its repetition rate. The MIR comb offset frequency is inherently known, so its direct detection is not required. An additional degree of freedom that further complements the versatility of our light source is a unique way of repetition rate or mode spacing adjustments. This is achieved by our new concept of coherent multi-seeding that depending on the configuration allows for pulse train modulation and mode spacing, or repetition rate division by an integer number.

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Tu, Rong, Chengyin Liu, Qingfang Xu, Kai Liu, Qizhong Li, Xian Zhang, Marina L. Kosinova, Takashi Goto i Song Zhang. "Epitaxial Growth of SiC Films on 4H-SiC Substrate by High-Frequency Induction-Heated Halide Chemical Vapor Deposition". Coatings 12, nr 3 (2.03.2022): 329. http://dx.doi.org/10.3390/coatings12030329.

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SiC epitaxial wafers offer enormous potential for a wide range of telecom technologies due to their excellent properties. The experimental process was simulated by software, and the contour of gas flow velocity and raw material mass fraction inside the chamber were obtained. SiC films were epitaxially grown on 4H-SiC single crystalline substrates at different temperatures for one batch, using SiCl4, CH4, and H2 as precursors. With increasing temperature, the crystal phase changed from 4H-SiC at 1773 K to a mixture of 4H- and 3C-SiC, and then a mixture of 3C-SiC and graphite at higher than 1923 K. The film was mainly (004)-oriented 4H-SiC and (111)-oriented 3C-SiC.

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38

Maring, Nicolas, Dario Lago-Rivera, Andreas Lenhard, Georg Heinze i Hugues de Riedmatten. "Quantum frequency conversion of memory-compatible single photons from 606 nm to the telecom C-band". Optica 5, nr 5 (27.04.2018): 507. http://dx.doi.org/10.1364/optica.5.000507.

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Lipatov, Denis, Olga Egorova, Andrey Rybaltovsky, Alexey Abramov, Alexey Lobanov, Andrey Umnikov, Mikhail Yashkov i Sergey Semjonov. "Highly Er/Yb-Co-Doped Photosensitive Core Fiber for the Development of Single-Frequency Telecom Lasers". Photonics 10, nr 7 (10.07.2023): 796. http://dx.doi.org/10.3390/photonics10070796.

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A highly erbium- and ytterbium-co-doped photosensitive fiber with a germanophosphosilicate glass core was fabricated by the MCVD method, utilizing an all-gas-phase deposition technique developed “in-house”. Due to doping with germanium oxide (GeO2), this fiber revealed high-grade photosensitivity (without hydrogen loading) to UV laser radiation at a 193 nm wavelength. The short (28 mm) Fabry–Perot laser cavity was designed by inscribing two fiber Bragg gratings (highly and partially reflective FBGs) directly in the core of the fabricated fiber sample. The stable single-frequency operation regime of the designed laser was observed. The laser emission peak was centered at 1540 nm, with a linewidth of 50 kHz. The slope efficiency of the laser was 10%, and the maximal output power reached a level of 35 mW.

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De Regis, Michele, Luigi Consolino, Saverio Bartalini i Paolo De Natale. "Waveguided Approach for Difference Frequency Generation of Broadly-Tunable Continuous-Wave Terahertz Radiation". Applied Sciences 8, nr 12 (24.11.2018): 2374. http://dx.doi.org/10.3390/app8122374.

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The 1–10 terahertz (THz) spectral window is emerging as a key region for plenty of applications, requiring not yet available continuous-wave room-temperature THz spectrometers with high spectral purity and ultra-broad tunability. In this regard, the spectral features of stabilized telecom sources can actually be transferred to the THz range by difference frequency generation, considering that the width of the accessible THz spectrum generally scales with the area involved in the nonlinear interaction. For this reason, in this paper we extensively discuss the role of Lithium Niobate (LN) channel-waveguides in the experimental accomplishment of a room-temperature continuous wave (CW) spectrometer, with μW-range power levels and a spectral coverage of up to 7.5 THz. To this purpose, and looking for further improvements, a thought characterization of specially-designed LN waveguides is presented, whilst discussing its nonlinear efficiency and its unprecedented capability to handle high optical power (107 W/cm2), on the basis of a three-wave-mixing theoretical model.

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Kasprowicz, Grzegorz. "MTCA.4 - modular measurement and control system with sub-nanosecond time synchronization and support for RF applications". International Journal of Electronics and Telecommunications 62, nr 3 (1.09.2016): 289–92. http://dx.doi.org/10.1515/eletel-2016-0040.

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Abstract The Micro TCA platform [1] is rapidly developing modular technology for measurement and control systems. There are available versions for laboratories, military and aviation. The newest release of the standard (MTCA.4) supports high frequency RF applications like particle accelerators, radio, telecom and radar. The PERG group together with partners from Europe and Poland takes active part in development process, i.e. implementation of sub-ns [2] synchronization, event and RF distribution system over fibre networks. It enhances significantly capabilities of MTCA platform in distributed measurement systems (i.e. passive radars) and enables fully deterministic operation of hard real time control systems.

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Nguyen, Cuong V., Minh T. Nguyen, Toan V. Quyen, Anh M. Le i Linh H. Truong. "The Hybrid Solar-RF Energy for Base Transceiver Stations". Wireless Communications and Mobile Computing 2020 (14.07.2020): 1–10. http://dx.doi.org/10.1155/2020/8875760.

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The base transceiver stations (BTS) are telecom infrastructures that facilitate wireless communication between the subscriber device and the telecom operator networks. They are deployed in suitable places having a lot of freely propagating ambient radio frequency (RF) and solar energies. This paper is aimed at converting received ambient environmental energy into usable electricity to power the stations. We proposed a hybrid energy harvesting system that can collect energy from RF and solar energies at the same time. The sources are combined to provide to a significant amount, to contribute to operational expenditures that reduce energy costs, and to improve the energy efficiency of the base station sites in rural areas from the most common renewable resources since the base stations are major consumers of cellular networks. The hybrid systems are designed with circuits, simulated, and compared to show their good performance to the base stations. PSIM, PROTEUS, and MATLAB software are used to simulate for evaluating the voltage and the current output of the hybrid systems that meet the power requirements. The design and simulation results show the feasibility of our proposed method with the battery storage that can be deployed not only in real base stations but also for other electrical operated systems.

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Brac de la Perrière, Vincent, Quentin Gaimard, Henri Benisty, Abderrahim Ramdane i Anatole Lupu. "Electrically injected parity-time symmetric distributed feedback laser diodes (DFB) for telecom applications". Nanophotonics 10, nr 4 (1.01.2021): 1309–17. http://dx.doi.org/10.1515/nanoph-2020-0587.

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Abstract The new paradigm of parity-time symmetry in quantum mechanics has readily been applied in the field of optics with numerous demonstrations of exotic properties in photonic systems. In this work, we report on the implementation of single frequency electrically injected distributed feedback (DFB) laser diodes based on parity-time symmetric dual gratings in a standard ridge waveguide configuration. We demonstrate enhanced modal discrimination for these devices as compared with index or gain coupled ones, fabricated in the same technology run. Optical transmission probing experiments further show asymmetric amplification in the light propagation confirming the parity-time symmetry signature of unidirectional light behavior. Another asset of these complex coupled devices is further highlighted in terms of robustness to optical feedback.

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Mishra, Jatadhari, Marc Jankowski, Alexander Y. Hwang, Hubert S. Stokowski, Timothy P. McKenna, Carsten Langrock, Edwin Ng i in. "Ultra-broadband mid-infrared generation in dispersion-engineered thin-film lithium niobate". Optics Express 30, nr 18 (23.08.2022): 32752. http://dx.doi.org/10.1364/oe.467580.

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Thin-film lithium niobate (TFLN) is an emerging platform for compact, low-power nonlinear-optical devices, and has been used extensively for near-infrared frequency conversion. Recent work has extended these devices to mid-infrared wavelengths, where broadly tunable sources may be used for chemical sensing. To this end, we demonstrate efficient and broadband difference frequency generation between a fixed 1-µm pump and a tunable telecom source in uniformly-poled TFLN-on-sapphire by harnessing the dispersion-engineering available in tightly-confining waveguides. We show a simultaneous 1–2 order-of-magnitude improvement in conversion efficiency and ∼5-fold enhancement of operating bandwidth for mid-infrared generation when compared to equal-length conventional lithium niobate waveguides. We also examine the effects of mid-infrared loss from surface-adsorbed water on the performance of these devices.

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Hafiza, Lia, Reni Dyah Wahyuningrum i Yudiansyah Yudiansyah. "Studies on the Use of Spectrum Sharing for Mobile Network Operator in Indonesia". Journal of Informatics and Communication Technology (JICT) 5, nr 1 (9.12.2023): 101–8. http://dx.doi.org/10.52661/j_ict.v5i1.186.

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Since telecom businesses have already reached their peak level of revenue, their future is expected to get worse. To save as much money as possible, greater than sixty percent of mobile network operators (MNO) in the worldwide implemented Radio Access Network-Sharing or RAN-Sharing. Earnings before interest, taxes, depreciation, and amortization (EBITDA) pressure and the limited availability of the frequency spectrum are two factors that propel. Spectrum sharing can be one solution to reduce Capital Expenditure and Operational Expenditure operator costs, address spectrum shortages and promote development across the region in Indonesia. With different coverage of underserved areas, the number of assets in the form of BTS and license of frequency spectrum usage are owned by each operator. Research on business impacts for operators needs to be assessed to be able to determine business strategy.

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Pokharel, Prakash. "Comparative Study on Promotional Strategies of Two Nepali Telecom Companies, NTC and Ncell". KMC Research Journal 6, nr 6 (31.12.2022): 65–76. http://dx.doi.org/10.3126/kmcrj.v6i6.59371.

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This paper is intended to compare the promotional strategies of two leading telecommunication industry of Nepal – NTC and Ncell. Telecommunication industry is vital for economic growth. It begins with analyzing and comparing their promotional activities. Then it compares the promotional strategies in two ways: in terms of frequency and in terms of budget they spend. Through comparison, it reveals that promotional activities have been taken very seriously by the Ncell than Nepal Telecom. On the basis of David Aakar model of brand equity, this paper also analyzes the effect of promotional activities into brand equity in the following ways: brand loyalty, brand awareness, perceived quality and brand association of telecommunication companies. It shows that two companies have difference in promotional strategies mainly because of their attitude to be a leader in market.

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Shen, Qixin, Amirhassan Shams-Ansari, Andrew M. Boyce, Nathaniel C. Wilson, Tao Cai, Marko Loncar i Maiken H. Mikkelsen. "A metasurface-based diamond frequency converter using plasmonic nanogap resonators". Nanophotonics 10, nr 1 (28.09.2020): 589–95. http://dx.doi.org/10.1515/nanoph-2020-0392.

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AbstractDiamond has attracted great interest as an appealing material for various applications ranging from classical to quantum optics. To date, Raman lasers, single photon sources, quantum sensing and quantum communication have been demonstrated with integrated diamond devices. However, studies of the nonlinear optical properties of diamond have been limited, especially at the nanoscale. Here, a metasurface consisting of plasmonic nanogap cavities is used to enhance both χ(2) and χ(3) nonlinear optical processes in a wedge-shaped diamond slab with a thickness down to 12 nm. Multiple nonlinear processes were enhanced simultaneously due to the relaxation of phase-matching conditions in subwavelength plasmonic structures by matching two excitation wavelengths with the fundamental and second-order modes of the nanogap cavities. Specifically, third-harmonic generation (THG) and second-harmonic generation (SHG) are both enhanced 1.6 × 107-fold, while four-wave mixing is enhanced 3.0 × 105-fold compared to diamond without the metasurface. Even though diamond lacks a bulk χ(2) due to centrosymmetry, the observed SHG arises from the surface χ(2) of the diamond slab and is enhanced by the metasurface elements. The efficient, deeply subwavelength diamond frequency converter demonstrated in this work suggests an approach for conversion of color center emission to telecom wavelengths directly in diamond.

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DR. VIKAS TYAGI, RAMESH C. HOODA,. "COMPARATIVE ANALYSIS OF CUSTOMER SATISFACTION OF TELECOM SERVICE PROVIDERS IN HARYANA". INFORMATION TECHNOLOGY IN INDUSTRY 9, nr 1 (10.03.2021): 709–19. http://dx.doi.org/10.17762/itii.v9i1.191.

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Objective of the study is to make a comparative analysis of customer satisfaction of different Telecom Service Providers in Haryana along with identification of factors which influence customer satisfaction. After completing extensive literature review, eight attributes namely ‘attractive offers’, ‘using advanced technology’, ‘mobile provider being friendly’, ‘reliability’, ‘promptness of response’, ‘it delivers promises, it makes’, ‘availability’ and ‘network’ are identified influencing customers satisfaction. Survey method was adopted for the study. 250 respondents of different TSP’s covering all Telecom Districts in Haryana. SPSS 21.0 was applied for analysis of the collected data. Statistical tools namely Descriptive Analysis, Frequency Analysis, Cross-Tabs Analysis and One Way ANOVA were used in the research study. After systematic analysis and findings of the study, it is found that highest percentage of respondents are satisfied with the attributes namely ‘attractive offers’, ‘mobile provider being friendly’, ‘availability’ and ‘network’ of Airtel along with ‘reliability’ and ‘it delivers promises, it makes’ of Vodafone-Idea, ‘promptness of response’ of BSNL and ‘using advanced technology’ of Reliance-Jio. It is also revealed from the study that Airtel is required to improve ‘reliability’ and ‘availability’ of its mobile networks. Vodafone-Idea needs to improve upon the attributes ‘attractive offers’, ‘using advanced technology’, ‘mobile provider being friendly’ and ‘network’. BSNL may further improve ‘promptness of response’ and Reliance-Jio needs to show improvement about ‘it delivers promises, it makes’. It is concluded from the research study that services of Airtel are preferred by maximum percentage of respondents.

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Hooda, Ramesh C., i Dr Vikas Tyagi. "Comparative Analysis of Customer Satisfaction of Telecom Service Providers in Haryana". Alinteri Journal of Agriculture Sciences 36, nr 2 (15.07.2021): 132–39. http://dx.doi.org/10.47059/alinteri/v36i2/ajas21125.

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Objective of the study is to make a comparative analysis of customer satisfaction of different Telecom Service Providers in Haryana along with identification of factors which influence customer satisfaction. After completing extensive literature review, eight attributes namely ‘attractive offers’, ‘using advanced technology’, ‘mobile provider being friendly’, ‘reliability’, ‘promptness of response’, ‘it delivers promises, it makes’, ‘availability’ and ‘network’ are identified influencing customers satisfaction. Survey method was adopted for the study. 250 respondents of different TSP’s covering all Telecom Districts in Haryana. SPSS 21.0 was applied for analysis of the collected data. Statistical tools namely Descriptive Analysis, Frequency Analysis, Cross-Tabs Analysis and One Way ANOVA were used in the research study. After systematic analysis and findings of the study, it is found that highest percentage of respondents are satisfied with the attributes namely ‘attractive offers’, ‘mobile provider being friendly’, ‘availability’ and ‘network’ of Airtel along with ‘reliability’ and ‘it delivers promises, it makes’ of Vodafone-Idea, ‘promptness of response’ of BSNL and ‘using advanced technology’ of Reliance-Jio. It is also revealed from the study that Airtel is required to improve ‘reliability’ and ‘availability’ of its mobile networks. Vodafone-Idea needs to improve upon the attributes ‘attractive offers’, ‘using advanced technology’, ‘mobile provider being friendly’ and ‘network’. BSNL may further improve ‘promptness of response’ and Reliance-Jio needs to show improvement about ‘it delivers promises, it makes’. It is concluded from the research study that services of Airtel are preferred by maximum percentage of respondents.

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Saltarelli, Francesco, Vikas Kumar, Daniele Viola, Francesco Crisafi, Fabrizio Preda, Giulio Cerullo i Dario Polli. "Photonic Time-Stretch Spectroscopy for Multiplex Stimulated Raman Scattering". EPJ Web of Conferences 205 (2019): 03003. http://dx.doi.org/10.1051/epjconf/201920503003.

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Stimulated Raman scattering spectroscopy enables label-free molecular identification, but its broadband implementation is technically challenging. We experimentally demonstrate a novel approach to multiplex stimulated Raman scattering based on photonic time stretch. A telecom fiber stretches the broadband femtosecond Stokes pulse after the sample to ∼15ns, mapping its spectrum in time. The signal is sampled through a fast oscilloscope, providing single-shot spectra at 80-kHz rate. We demonstrate high sensitivity in detecting the Raman vibrational modes of various samples over the entire high-frequency C-H stretching region. Our results pave the way to high-speed broadband vibrational imaging for materials science and biophotonics.

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