Bibliographies thématiques / Optical Frequency Comb (OFC)

Littérature scientifique sur le sujet « Optical Frequency Comb (OFC) »

Auteur : Grafiati
Publié le 10 mars 2023

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Articles de revues sur le sujet "Optical Frequency Comb (OFC)"

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Sadiek, Ibrahim, Tommi Mikkonen, Markku Vainio, Juha Toivonen et Aleksandra Foltynowicz. « Optical frequency comb photoacoustic spectroscopy ». Physical Chemistry Chemical Physics 20, no 44 (2018) : 27849–55. http://dx.doi.org/10.1039/c8cp05666h.

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D. Lakshmijayasimha, Prajwal D., Prince M. Anandarajah, Pascal Landais et Aleksandra Kaszubowska-Anandarajah. « Optical Frequency Comb Expansion Using Mutually Injection-Locked Gain-Switched Lasers ». Applied Sciences 11, no 15 (31 juillet 2021) : 7108. http://dx.doi.org/10.3390/app11157108.

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We propose a novel scheme for the expansion and comb densification of gain-switched optical frequency combs (GS-OFC). The technique entails mutual injection locking of two gain-switched lasers with a common master to generate a wider bandwidth OFC. Subsequently, the OFC is further expanded and/or densified using a phase modulator with optimum drive conditions. We experimentally demonstrate the generation of an OFC with 45 highly correlated lines separated by 6.25 GHz with an expansion factor ~3. In addition, operating in comb densification mode, the channel spacing of the OFC is tuned from 6.25 GHz to 390.625 MHz. Finally, a detailed characterization of the lines, across the entire expanded comb, is reported highlighting the excellent spectral purity with linewidths of ~40 kHz, a relative intensity noise better than –152 dB/Hz, and a high degree of phase correlation between the comb lines. The proposed method is simple, highly flexible and the architecture is suitable for photonic integration, all of which make such an OFC extremely attractive for the employment in a multitude of applications.
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Ren, Huiping, Li Fan, Na Liu, Zhengmao Wu et Guangqiong Xia. « Generation of Broadband Optical Frequency Comb Based on a Gain-Switching 1550 nm Vertical-Cavity Surface-Emitting Laser under Optical Injection ». Photonics 7, no 4 (23 octobre 2020) : 95. http://dx.doi.org/10.3390/photonics7040095.

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In this work, broadband optical frequency comb (OFC) generation by a gain-switching vertical-cavity surface-emitting laser (VCSEL) subject to optical injection is investigated experimentally. During implementing the experiment, a 1550 nm VCSEL under a large signal current modulation is driven into the gain-switching state with a broad noisy spectrum. By further introducing an optical injection, a high performance OFC can be produced. The experimental results demonstrate that the power and wavelength of the injection light seriously affect the performance of the produced OFC. Under proper optical injection parameters, two sub-combs originating from two orthogonal polarization components of the VCSEL can splice into a broadband total-OFC. By selecting optimized operation parameters, a high quality total-OFC can be acquired, with stable comb lines, high coherence, wide bandwidth of 70.0 GHz (56.0 GHz) within 10 dB (3 dB) amplitude variation and low single sideband phase noise at the fundamental frequency below −120.6 dBc/Hz @ 10 kHz.
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Tan, Zeyu, et Lirong Huang. « Optical-Frequency-Comb Generation Based on Single-Tone Modulation and Four-Wave Mixing Effect in One Single Semiconductor Optical Amplifier ». Photonics 9, no 10 (9 octobre 2022) : 746. http://dx.doi.org/10.3390/photonics9100746.

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We propose a novel optical-frequency-comb (OFC) generation scheme based on single-tone modulation and the four-wave mixing (FWM) effect in one single semiconductor optical amplifier (SOA) modulated by a radio frequency (RF) current. A comprehensive broad-band dynamic model, which considers single-tone modulation and the FWM effect, is presented. The simulated results show that, although only one single continuous-wave light is input into the SOA, an OFC with a large number of frequency components can be achieved as a result of single-tone modulation and the FWM effect in the SOA. The number of comb lines and the spectral bandwidth of the OFC increase by raising the amplitude of the RF modulation current. Increasing the input light power can increase the average optical power of the OFC. The frequency interval is tunable within a certain range by tuning the frequency of the RF modulation current injected into the SOA.
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Chen, Bo, Qunfeng Dong, Biao Cao, Weile Zhai et Yongsheng Gao. « Broadband Microwave Photonic Channelizer with 18 Channels Based on Acousto-Optic Frequency Shifter ». Photonics 10, no 2 (20 janvier 2023) : 107. http://dx.doi.org/10.3390/photonics10020107.

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A microwave photonic channelizer can achieve instantaneous reception of ultra-wideband signals and effectively avoid electronic bottleneck; therefore, it can be perfectly applied to a wideband radar system and electronic warfare. In channelization schemes based on an optical frequency comb (OFC), the number of comb lines usually depends on that of the sub-channels. In order to improve the utilization rate of the comb lines of OFC, we propose a scheme to shift the frequency of OFC by using an acousto-optic frequency shifter (AOFS), which can obtain three times the number of sub-channels of the comb lines of an OFC. In order to simplify the experiment, only a three-line OFC is used in the experiment. A three-line local oscillator (LO) OFC is frequency-shifted up and down by two AOFSs, and nine optical LO signals with different frequencies are obtained, thereby realizing the simultaneous reception of eighteen sub-channels. The proposed scheme enjoys a large number of sub-channels and minimal channel crosstalk. Experimental results demonstrate that a 9-GHz bandwidth RF signal covering 10–19 GHz is divided into 18 sub-channels with a sub-bandwidth of 500 MHz. The image rejection ratio of the sub-channels is about 23 dB, and the spurious-free dynamic range (SFDR) of the receiver can reach 98 dB·Hz2/3.
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Zhu, Song, Lei Shi, Linhao Ren, Yanjing Zhao, Bo Jiang, Bowen Xiao et Xinliang Zhang. « Controllable Kerr and Raman-Kerr frequency combs in functionalized microsphere resonators ». Nanophotonics 8, no 12 (6 novembre 2019) : 2321–29. http://dx.doi.org/10.1515/nanoph-2019-0342.

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AbstractOptical frequency comb (OFC) based on the whispering-gallery-mode microresonator has various potential applications in fundamental and applied areas. Once the solid microresonator is fabricated, its structure parameters are generally unchanged. Therefore, realizing the tunability of the microresonator OFC is an important precondition for many applications. In this work, we proposed and demonstrated the tunable Kerr and Raman-Kerr frequency combs using the ultrahigh-quality-factor (Q) functionalized silica microsphere resonators, which are coated with iron oxide nanoparticles on their end surfaces. The functionalized microsphere resonator possesses Q factors over 108 and large all-optical tunability due to the excellent photothermal performance of the iron oxide nanoparticles. We realized a Kerr frequency comb with an ultralow threshold of 0.42 mW and a comb line tuning range of 0.8 nm by feeding the control light into the hybrid microsphere resonator through its fiber stem. Furthermore, in order to broaden the comb span, we realized a Raman-Kerr frequency comb with a span of about 164 nm. Meanwhile, we also obtained a comb line tuning range of 2.67 nm for the Raman-Kerr frequency comb. This work could find potential applications in wavelength-division multiplexed coherent communications and optical frequency synthesis.
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Niu, Qiong, Mingyu Song, Jihui Zheng, Linhua Jia, Junchen Liu, Lingman Ni, Ju Nian, Xingrui Cheng, Fumin Zhang et Xinghua Qu. « Improvement of Distance Measurement Based on Dispersive Interferometry Using Femtosecond Optical Frequency Comb ». Sensors 22, no 14 (20 juillet 2022) : 5403. http://dx.doi.org/10.3390/s22145403.

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Since the dispersive interferometry (DPI) based on optical frequency combs (OFCs) was proposed, it has been widely used in absolute distance measurements with long-distance and high precision. However, it has a serious problem for the traditional DPI based on the mode-locked OFC. The error of measurements caused by using the fast Fourier transform (FFT) algorithm to process signals cannot be overcome, which is due to the non-uniform sampling intervals in the frequency domain of spectrometers. Therefore, in this paper, we propose a new mathematical model with a simple form of OFC to simulate and analyze various properties of the OFC and the principle of DPI. Moreover, we carry out an experimental verification, in which we adopt the Lomb–Scargle algorithm to improve the accuracy of measurements of DPI. The results show that the Lomb–Scargle algorithm can effectively reduce the error caused by the resolution, and the error of absolute distance measurement is less than 12 μm in the distance of 70 m based on the mode-locked OFC.
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Anashkina, Elena A., Maria P. Marisova, Alexey V. Andrianov, Rinat A. Akhmedzhanov, Rihards Murnieks, Mikhail D. Tokman, Laura Skladova et al. « Microsphere-Based Optical Frequency Comb Generator for 200 GHz Spaced WDM Data Transmission System ». Photonics 7, no 3 (11 septembre 2020) : 72. http://dx.doi.org/10.3390/photonics7030072.

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Optical frequency comb (OFC) generators based on whispering gallery mode (WGM) microresonators have a massive potential to ensure spectral and energy efficiency in wavelength-division multiplexing (WDM) telecommunication systems. The use of silica microspheres for telecommunication applications has hardly been studied but could be promising. We propose, investigate, and optimize numerically a simple design of a silica microsphere-based OFC generator in the C-band with a free spectral range of 200 GHz and simulate its implementation to provide 4-channel 200 GHz spaced WDM data transmission system. We calculate microsphere characteristics such as WGM eigenfrequencies, dispersion, nonlinear Kerr coefficient with allowance for thermo-optical effects, and simulate OFC generation in the regime of a stable dissipative Kerr soliton. We show that by employing generated OFC lines as optical carriers for WDM data transmission, it is possible to ensure error-free data transmission with a bit error rate (BER) of 4.5 × 10−30, providing a total of 40 Gbit/s of transmission speed on four channels.
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Shen, Ze-Min, Xiao-Long Zhou, Dong-Yu Huang, Yu-Hao Pan, Li Li, Jian Wang, Chuan-Feng Li et Guang-Can Guo. « Continuously and widely tunable frequency-stabilized laser based on an optical frequency comb ». Review of Scientific Instruments 94, no 2 (1 février 2023) : 023001. http://dx.doi.org/10.1063/5.0120119.

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Continuously and widely tunable lasers, actively stabilized on a frequency reference, are broadly employed in atomic, molecular, and optical (AMO) physics. The frequency-stabilized optical frequency comb (OFC) provides a novel optical frequency reference, with a broadband spectrum that meets the requirement of laser frequency stabilization. Therefore, we demonstrate a frequency-stabilized and precisely tunable laser system based on it. In this scheme, the laser frequency locked to the OFC is driven to jump over the ambiguity zones, which blocks the wide tuning of the locked laser, and tuned until the mode hopping happens with the always-activated feedback loop. Meanwhile, we compensate the gap of the frequency jump with a synchronized acoustic optical modulator to ensure the continuity. This scheme is applied to an external cavity diode laser (ECDL), and we achieve tuning at a rate of about 7 GHz/s, with some readily available commercial electronics. Furthermore, we tune the frequency-stabilized laser only with the feedback of diode current, and its average tuning speed can exceed 100 GHz/s. Due to the resource-efficient configuration and the simplicity of completion, this scheme can be referenced and can find wide applications in AMO experiments.
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I. Hammadi, Yousif, et Tahreer S. Mansour. « Relationship between the voltage applied to MZM arms and the generation of optical frequency comb ». International Journal of Engineering & ; Technology 7, no 4.15 (7 octobre 2018) : 405. http://dx.doi.org/10.14419/ijet.v7i4.15.23026.

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In this study, an optical frequency comb source (OFCS) based on a dual-drive Mach–Zehnder modulator (MZM) is constructed and theoretically demonstrated. A mathematical model of the constructed OFCS is then built to investigate the effect of the peak-to-peak radio frequency (RF) signals applied to the MZM arms on the generated optical frequency comb (OFC) lines at the MZM output. A dual-drive MZM, a continuous wave laser source, and an RF signal source are included in the OFCS. The chirp parameter can be controlled and 64 comb lines generated at a comb spacing of 25 GHz by regulating voltages applied to the MZM arms. The developed OFCS is relatively simple but valuable. The generated OFC lines can be used for high data-rate transmission.
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Thèses sur le sujet "Optical Frequency Comb (OFC)"

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Doumbia, Yaya. « Optical injection dynamics and polarization properties of semiconductor lasers frequency combs ». Electronic Thesis or Diss., CentraleSupélec, 2021. http://www.theses.fr/2021CSUP0008.

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Dans ce travail, nous étudions la dynamique non linéaire de diodes laser injectées optiquement avec des peignes de fréquence.Nous analysons d'abord théoriquement et expérimentalement la dynamique non linéaire des lasers à émettant par la tranche (EELs) à partir d'une injection optique de peignes de fréquence. Les paramètres d'injection et les propriétés du peigne injecté sont variés pour dévoiler plusieurs dynamiques verrouillées et déverrouillées. Pour une force d'injection suffisamment grande et sur une large plage de désaccord, le verrouillage d'injection bifurque vers une dynamique temporelle correspondant à un peigne de fréquence optique qui étend le peigne injecté à un spectre optique beaucoup plus large. Une analyse de bifurcation révèle une dynamique de peigne de fréquence harmonique en cascade conduisant à une augmentation significative des lignes de peigne de sortie. Nous avons également utilisé les paramètres d'injection, les propriétés du peigne et le courant d'injection pour contrôler les propriétés du nouve peigne. Dans un deuxième temps, nous analysons expérimentalement la dynamique non linéaire et les propriétés de polarisation dans des lasers émettant par la surface (VCSEL) soumis à une injection optique orthogonale avec des peignes de fréquence. Plus important encore, le VCSEL montre deux peignes de fréquence avec une polarisation orthogonale à partir d'un seul appareil pour certains paramètres d'injection. Nous démontrons également la possibilité de contrôler le taux de répétition des peignes à une ou deux polarisations grâce à la génération de peignes à fréquence harmonique. Nous présentons enfin expérimentalement et théoriquement la dynamique d'injection de VCSEL à partir d'une injection de peigne de fréquence optique avec une polarisation parallèle à celle du VCSEL. Nous montrons que la performance des peignes à deux polarisations sont limitées à une injection de courant élevé dans le cas d'une injection optique parallèle. Pour un courant de polarisation fixe, la dynamique des deux peignes de polarisation disparaît lorsque l'on augmente l'espacement des peignes injectés.Cette thèse démontre donc outre son intérêt pour la dynamique laser non linéaire, l'injection optique est une technique permettant d'exploiter les propriétés de peigne dans les diodes laser
In this work, we study the nonlinear dynamics of laser diodes optically injected with frequency combs.We first theoretically and experimentally analyze the nonlinear dynamics of edge-emitting lasers (EELs) from an optical injection of frequency combs. The injection parameters and injected comb properties are varied to unveil several locked and unlocked dynamics. For large enough injection strength and over a large detuning range, the injection locking bifurcates to a time-periodic dynamics corresponding to an optical frequency comb that extends the injected comb to a much broader optical spectrum. A bifurcation analysis reveals a cascade harmonic frequency comb dynamics leading to a significant increase in the output comb lines. We have also used the injection parameters, comb properties, and injection current to control the new comb properties. We secondly analyze the nonlinear dynamics and polarization properties in vertical-cavity surface-emitting lasers (VCSELs) subject to orthogonal optical injection with frequency combs experimentally. Most importantly, the VCSEL shows two frequency combs with orthogonal polarization from a single device for some injection parameters. We also demonstrate the possibility to control the single or two polarizations comb repetition rate through harmonic frequency combs generation. We finally present experimentally and theoretically the VCSEL injection dynamics from parallel optical frequency comb injection. We show that the two polarizations combperformance is restricted to high current injection in the case of parallel optical injection. For fixed bias current, the two polarization comb dynamics disappear when increasing the injected comb spacing.This thesis therefore demonstrates besides its interest for nonlinear laser dynamics, optical injection is a technique to harness the comb properties in laser diodes
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Brother, Louis Reginald. « Terahertz optical frequency comb generation ». Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10746.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
Includes bibliographical references (leaves 191-195).
by Louis Reginald Brothers, Jr.
Ph.D.
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Wu, David S. « Optical frequency comb locked signal synthesis ». Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/375133/.

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Highly stable optical frequency combs (OFCs), particularly those generated by modelocked lasers, have become important tools for frequency and time metrology, and spectroscopy. This is due to their ability to span wide bandwidths, to act as highly accurate frequency references, and to provide a direct link between the optical and radio frequencies. However, the narrow comb spacing of most mode-locked OFCs makes it difficult to access their individual modes for a wide range of other potential applications. This thesis investigates comb mode extraction from a 250 MHz spaced OFC by phase locking semiconductor lasers (slave lasers) to individual comb modes. This was achieved using optical injection locking in combination with a low bandwidth electronic feedback loop. The locking process forced a slave laser to emit at the same frequency as the comb mode it was locked to, but at its natural output power. Hence a locked slave laser effectively behaved as a ultra-narrowband filter with active gain. The locking process was characterised in terms of its long-term frequency stability over a period of 8 hours (minimum Allan deviation of less than 10-18) and its short term phase noise across a bandwidth from 100 Hz to 500 MHz (minimum integrated phase noise of 0.02 rad2). Amplification of the residual comb modes was measured and found to have a dependence on the master-slave frequency detuning. The results from numerical modelling found that this was due to phase modulation induced in the slave laser by the injected OFC and could always be suppressed by controlling the frequency detuning. Fourier synthesis of high repetition rate waveforms was explored as one of the potential applications of this phase locking technique. Multiple lasers were made coherent with one another by locking them to different modes of a common OFC. This enabled them to behave as different frequency components of a Fourier series to generate various waveforms. This was achieved by independently controlling the relative amplitude and phase of each slave laser, and combining them together. The generation of stable waveforms with at-top, triangular, parabolic, and sawtooth intensity profiles was demonstrated at a repetition rate of 100 GHz.
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Del'Haye, Pascal. « Optical Frequency Comb Generation in Monolithic Microresonators ». Diss., lmu, 2011. http://nbn-resolving.de/urn:nbn:de:bvb:19-130491.

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Cai, Yin. « Quantum coherent control with an optical frequency comb ». Thesis, Paris, Ecole normale supérieure, 2015. http://www.theses.fr/2015ENSU0030/document.

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Les états quantiques multimodes sont au coeur des protocoles detraitement quantique de l’information et de métrologie quantique. Àpartir d’un peigne de fréquence optique injectant un oscillateurparamétrique optique pompé en mode synchrone (SPOPO) nousavons généré des états multimodes en temps/fréquence. Unsimulateur quantique est alors mis en place à partir de ce SPOPO et demise en forme d’impulsion, et permet de mettre en évidence de étatsclusters pouvant compter jusque 12 noeuds et un protocole departage de secret quantique à six partenaires. De plus, une détectionmultipixel résolue en fréquence est développée et utilisée pourréaliser un état cluster linéaire à 8 noeuds. Nous avons égalementutilisé cette source pour développer un spectromètre ayant unesensibilité allant au delà de celle imposée par les fluctuations du videquantique
Multimode squeezing plays an essential role in quantum informationprocessing and quantum metrology. Using optical frequency combs,we generate multi-temporal-mode state from a synchronouslypumped optical parametric oscillator (SPOPO). An on-demandquantum network simulator is developed using the SPOPO andultrafast pulse shaping; up-to-twelve-node cluster states and asix-partite quantum secret sharing protocol are experimentallyemulated with this simulator. Furthermore, frequency resolvedmultipixel detectors are employed, and used to realize aline-shape-eight-node cluster state. We also developed a multimodequantum spectrometer, which is able to exceed the standardquantum limit for measuring manifold parameters of ultrafast pulses
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Seton, Ragnar. « Data acquisition system for optical frequency comb spectroscopy ». Thesis, Umeå universitet, Institutionen för fysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-139117.

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The Optical Frequency Comb Spectroscopy (OFCS) Group at the Department of Physics at Umeå University develops new techniques for extremely high sensitivity trace gas detection, non invasive temperature measurements, and other applications of OFCS. Their setup used primarily for trace gas detection contains several components that have been developed in-house, including a Fourier Transform Spectrometer (FTS) and an auto-balancing detector. This is the one used in this thesis work and it includes a high frequency data acquisition card (DAC) recording interferograms in excess of 10^7 double-precision floating point samples per sweep of the FTS's retarder. For acquisition and analysis to be possible in both directions of the retarder the interferograms needs to be analysed in a sub-second timeframe, something not possible with the present software. The aim of this thesis work has thus been to develop a system with optimized analysis implementations in MATLAB. The latter was a prerequisite from the group to ensure maintainability, as all members are well acquainted with it.Fulfilling its primary purpose MATLAB performs vector and matrix computations quite efficiently, has mostly fully mutable datatypes, and with recent just-in-time (JIT) compilation optimizations vector resizing performance has improved to what in many instances is perceived as equivalent to preallocated variables. This memory management abstraction, however, also means that explicit control of when arguments are passed by value or by reference to a function is not officially supported. The following performance ramifications naturally increase with the size of the data sets (N) passed as arguments and become quite noticeable even at moderate values of N when dealing with data visualization, a key function in system. To circumvent these problems explicit data references were implemented using some of the undocumented functions of MATLAB's libmx library together with a custom data visualization function.The main parts of the near real time interferogram analysis are resampling and a Fourier transformation, both of which had functionally complete but not optimized implementations. The minimal requirement for the reimplementation of these were simply to improve efficiency while maintaining output precision.On experimentally obtained data the new system's (DAQS) resampling implementation increased sample throughput by a factor of 19 which in the setup used corresponds to 10^8 samples per second. Memory usage was decreased by 72% or in terms of the theoretical minimum from a factor 7.1 to 2.0. Due to structural changes in the sequence of execution DAQS has no corresponding implementation of the reference FFT function as the computations performed in it have been parallelized and/or are only executed on demand, their combined CPU-time can however in a worst-case scenario reach 75% of that of the reference. The data visualization performance increase (compared to MATLAB's own, as the old system used LabVIEW) depends on the size in pixels of the surface it is visualized on and N, decreasing with the former and increasing with the latter. In the baseline case of a default surface size of 434x342 pixels and N corresponding to one full sweep of the FTS's retarder DAQS offers a 100x speed-up to the Windows 7 version of MATLAB R2014b's plot.In addition to acquiring and analyzing interferograms the primary objectives of the work included tools to configure the DAC and controlling the FTS's retarder motor, both implemented in DAQS.Secondary to the above was the implementation of acquisition and analysis for both directions of the retarder, a HITRAN reference spectra generator, and functionality to improve the user experience (UX). The first, though computation time allows for it, has not been implemented due to a delay in the DAC-driver. To provide a generic implementation of the second, the HITRAN database was converted from the text-based format it is distributed in to a MySQL database, a wrapper class providing frequency-span selection and the absorption spectra generation was developed together with a graphical front-end. Finally the improved UX functionality mainly focused on providing easy-access documentation of the properties of the DAC.In summation, though the primary objectives of optimizing the data analysis functions were reached, the end product still requires a new driver for the DAC to provide the full functionality of the reference implementation as the existing one is simply too slow. Many of DAQS' components can however be used as stand-alone classes and functions until a new driver is available. It is also worth mentioning that National Instruments (NI), the DAC vendor, has according to their technical support no plans to develop native MATLAB drivers as MathWorks will not sell them licenses.
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Marian, Adela Ye Jun. « Direct frequency comb spectroscopy for optical frequency metrology and coherent interactions ». Diss., Connect to online resource, 2005. http://wwwlib.umi.com/dissertations/fullcit/3186934.

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Buettner, Thomas Frank Sebastian. « Brillouin Frequency Comb Generation in Chalcogenide Waveguides ». Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/14447.

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Compact optical frequency comb sources with gigahertz repetition rates are desirable for various important applications including arbitrary optical waveform generation, microwave synthesis, spectroscopy and advanced telecommunications. This thesis investigates the exploitation of the interplay of two distinct nonlinear optical effects for the generation of gigahertz repetition rate frequency combs: stimulated Brillouin scattering (SBS) and the optical Kerr-effect. This interplay can lead to the generation of Brillouin frequency combs (BFCs) with repetition rates that are equal to the acoustic resonance associated with SBS. This resonance frequency is about 8 GHz, making BFCs ideal for the advanced photonic applications of interest. In this thesis, we experimentally demonstrate BFCs with equally spaced comb modes that exhibit a stable and repeatable spectral phase. The BFCs are generated in chalcogenide fibre and in chalcogenide waveguides on photonic chips. Through theoretical and numerical investigations we show that, whilst SBS provides the high repetition rate of the combs, the Kerr-nonlinearity plays an important role in achieving equally spaced and phase-coherent spectral components. We also study the interplay of BFCs and photosensitivity via multiphoton absorption in chalcogenide fibres and photonic chips. We show that this interplay can be used to internally inscribe multiwavelength gratings that exhibit several stopbands that are spaced by the acoustic resonance frequency. We then use these gratings in an SBS configuration and demonstrate a significant enhancement of BFC generation by exploiting the slow light effects associated with the grating band edges. This body of work represents an advance in the understanding of BFCs. We study the physics behind phase-coherent BFC generation. The demonstration of chip-based BFC generation is a step towards an all integrated, gigahertz repetition rate, optical frequency comb source. We also demonstrate a novel and flexible method for enhancing chip-based BFC generation that can potentially be extended to other nonlinear effects.
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Del´Haye, Pascal [Verfasser]. « Optical Frequency Comb Generation in Monolithic Microresonators / Pascal Del´Haye ». München : Verlag Dr. Hut, 2011. http://d-nb.info/1013526236/34.

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Rydberg, Olof. « Stabilization of an optical frequency comb to an external cavity ». Thesis, Umeå universitet, Institutionen för fysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-93439.

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The subject of this master's thesis is stabilizing a frequency comb laser to an external cavity using a couple of servo controllers. The aim of the project was to build a pair of servo controllers, replacing parts of the existing commercial and proprietary solution already in use. The system under control is an optical frequency comb, which is locked to an external cavity and is used for trace gas detection and spectroscopy. The comb is a broadband light source and needs to be locked to the external cavity in order to achieve maximum transmission through the cavity. The goal was to replace two of the original controllers and try to improve the locking capabilities of the system. The controllers were also supposed to be customizable and for that reason the control system with all its components was built on breadboards and confined in an aluminium box. Control circuits were built for the purpose, one for controlling the comb offset frequency by modulating the pump diode current, the other for controlling the repetition rate of the comb laser by altering the length of the laser cavity using a piezo-electric transducer (PZT). A commercial and proprietary servo controller was also in the system, controlling an intra-cavity electro-optic modulator. It was kept for controlling the higher frequency region, for which the PZT no longer worked. In order to simulate and design the system, Matlab was used with functions described by both theoretically and experimentally obtained mathematical equations. The controllers were tested thoroughly in order to make sure they acted according to the intended design, before they were tested with the laser. After an initial lock was obtained, the controllers were optimized further using both experimental and theoretical methods until the lock was optimized and the transmission through the cavity was maximized. The error signals that were used for controlling the system were monitored with both an oscilloscope and a spectrum analyser, the latter producing a spectrum with the power ratio plotted versus frequency. The transmission intensity through the cavity was measured when a good lock had been achieved and the results were analysed by applying a Fourier transform to the measured data. This was done with both the old controllers and the new controllers and the resulting plots were compared. Analysis showed that the new control system yielded a transmission signal with a slightly reduced noise level compared to the signal resulting from using the old controllers. The results from the spectrum analyser also showed slightly reduced error signals for the new controllers compared to those of the old controllers. When summarising this work it can be concluded that the goals set up at the start were achieved with results living up to the expectations. The results also verified that such a control system can be built for locking an optical frequency comb to an external cavity with simple and rather cheap components and with good results.
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Livres sur le sujet "Optical Frequency Comb (OFC)"

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Ye, Jun, et Steven T. Cundiff, dir. Femtosecond Optical Frequency Comb : Principle, Operation, and Applications. Boston : Kluwer Academic Publishers, 2005. http://dx.doi.org/10.1007/b102450.

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Femtosecond Optical Frequency Comb : Principle, Operation and Applications. Springer, 2006.

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Cundiff, Steven T., et Jun Ye. Femtosecond Optical Frequency Comb : Principle, Operation and Applications. Springer, 2010.

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(Editor), Jun Ye, et Steven T. Cundiff (Editor), dir. Femtosecond Optical Frequency Comb : Principle, Operation and Applications. Springer, 2004.

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Pfeifle, Jorg. Terabit-Rate Transmission Using Optical Frequency Comb Sources. KIT Scientific Publishing, 2017.

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Methodology for predicting the behavior of optical frequency comb. Lambert Academic Publishing, 2017.

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Patel, Bhakti K., et John P. Kress. Management of sedation in the critically ill. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0359.

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Once adequate analgesia is confirmed, the need for sedation should be considered. Sedation of mechanically-ventilated patients is a common challenge in the intensive care unit (ICU). Metabolism of sedatives in critical illness can be unpredictable and achieving optimal sedation without coma is a moving target. Once adequate analgesia is achieved, the choice, depth, and duration of sedation can have major implications for the presence of delirium, the duration of mechanical ventilation, ventilator-associated pneumonia, and ICU length of stay. Therefore, goal-directed titration of sedative and frequent assessment of the depth of sedation is important to strike the delicate balance of patient comfort, while avoiding excessive prolonged sedation.
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Koenderink, Jan, Andrea van Doorn et Johan Wagemans. The Invisible Saddle, or the Cap-or-Cup Illusion. Oxford University Press, 2017. http://dx.doi.org/10.1093/acprof:oso/9780199794607.003.0022.

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The linear luminance gradient in a circular disk has become a standard example of the “shape from shading cue” in vision science. It is generally supposed to give rise to one of three possible 3D responses, namely “flat” (cue does not work), “cap” (or convexity), or “cup (concavity). From the perspective of ecological optics, there is an infinite set of possibilities, one of which, “saddle,” has—to the best of our knowledge—never been suggested by any human observer. Bayesian convictions do not come to the rescue, because saddles are actually more frequent than caps or cups. The “illusion” is a strong one, because even if we know (e.g., have programmed it) to look at a saddle, we will see a cap (mostly) or cup (sometimes). Thus not only is the shading cue infinitely ambiguous; it is associated with an extreme bias, which might properly be considered an aphasia (soul blindness).
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Chapitres de livres sur le sujet "Optical Frequency Comb (OFC)"

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Jewariya, Mukesh. « Optical Frequency Comb ». Dans Handbook of Metrology and Applications, 1–16. Singapore : Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1550-5_13-1.

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Dong, Bozhang. « Quantum-Dot Optical Frequency Comb ». Dans Springer Theses, 123–61. Cham : Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-17827-6_5.

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Lomsadze, Bachana, et Steven T. Cundiff. « Frequency Comb-Based Multidimensional Coherent Spectroscopy ». Dans Springer Series in Optical Sciences, 339–54. Singapore : Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9753-0_15.

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Masłowski, P., K. C. Cossel, A. Foltynowicz et J. Ye. « Cavity-Enhanced Direct Frequency Comb Spectroscopy ». Dans Springer Series in Optical Sciences, 271–321. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-40003-2_8.

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Keller, Ursula. « Optical Frequency Comb from Modelocked Lasers ». Dans Ultrafast Lasers, 639–702. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-82532-4_12.

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Zhang, Jianjun, et Jing Li. « Optical Frequency Comb Generation Mechanism and Application ». Dans Satellite Photoelectric Sensing Technology, 111–32. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-89843-4_8.

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Ban, Ticijana, Damir Aumiler, Hrvoje Skenderović et Goran Pichler. « Mapping of the Optical Frequency Comb to the Atom Velocity Comb ». Dans Ultrafast Phenomena XV, 127–29. Berlin, Heidelberg : Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-68781-8_41.

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Hänsch, Theodor W., et Nathalie Picqué. « Frequency Combs ». Dans Springer Handbook of Lasers and Optics, 1285–304. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-19409-2_17.

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Zhang, Jianjun, et Jing Li. « Channelized Receiving Technology Based on Optical Frequency Comb ». Dans Satellite Photoelectric Sensing Technology, 133–52. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-89843-4_9.

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Udem, Thomas, Ronald Holzwarth, Marcus Zimmermann, Christoph Gohle et Theodor Hänsch. « Optical Frequency-Comb Generation and High-Resolution Laser Spectroscopy ». Dans Topics in Applied Physics, 295–317. Berlin, Heidelberg : Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-39849-3_7.

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Actes de conférences sur le sujet "Optical Frequency Comb (OFC)"

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Zheng, Bofang, Qijie Xie, Ning Zhang et Chester Shu. « Cavity-less 50GHz Frequency Comb Generation by Comb Pitch Multiplication ». Dans Optical Fiber Communication Conference. Washington, D.C. : OSA, 2017. http://dx.doi.org/10.1364/ofc.2017.m3f.3.

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Fülöp, Attila, Mikael Mazur, Abel Lorences-Riesgo, Pei-Hsun Wang, Yi Xuan, Dan E. Leaird, Minghao Qi, Peter A. Andrekson, Andrew M. Weiner et Victor Torres-Company. « Frequency Noise of a Normal Dispersion Microresonator-based Frequency Comb ». Dans Optical Fiber Communication Conference. Washington, D.C. : OSA, 2017. http://dx.doi.org/10.1364/ofc.2017.w2a.6.

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Reimer, Christian, Michael Kues, Piotr Roztocki, Stefania Sciara, Luis Romero Cortés, Benjamin Wetzel, Yanbing Zhang et al. « On-chip quantum optical frequency comb sources ». Dans Optical Fiber Communication Conference. Washington, D.C. : OSA, 2018. http://dx.doi.org/10.1364/ofc.2018.m4g.4.

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Sohanpal, Ronit, Haonan Ren, Li Shen, Callum Deakin, Alexander M. Heidt, Thomas W. Hawkins, John Ballato, Ursula J. Gibson, Anna C. Peacock et Zhixin Liu. « Parametric frequency comb generation using silicon core fiber ». Dans Optical Fiber Communication Conference. Washington, D.C. : OSA, 2021. http://dx.doi.org/10.1364/ofc.2021.m5b.5.

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Liu, Sheng, Trina T. Ng, David J. Richardson et Periklis Petropoulos. « An Optical Frequency Comb Generator as a Broadband Pulse Source ». Dans Optical Fiber Communication Conference. Washington, D.C. : OSA, 2009. http://dx.doi.org/10.1364/ofc.2009.othg7.

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Quinlan, Franklyn, Sangyoun Gee, Sarper Ozharar et Peter J. Delfyett. « Stabilized Optical Frequency Comb Source for Coherent Communication and Signal Processing ». Dans OFC/NFOEC 2007 - 2007 Conference on Optical Fiber Communication and the National Fiber Optic Engineers Conference. IEEE, 2007. http://dx.doi.org/10.1109/ofc.2007.4348637.

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Deakin, Callum, et Zhixin Liu. « Performance of dual frequency comb channelizers for RF signal processing ». Dans Optical Fiber Communication Conference. Washington, D.C. : OSA, 2021. http://dx.doi.org/10.1364/ofc.2021.tu5f.4.

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Sakamoto, T., T. Kawanishi et M. Izutsu. « 50-nm wavelength-tunable self-oscillating electro-optic frequency comb generator ». Dans OFCNFOEC 2006. 2006 Optical Fiber Communication Conference and the National Fiber Optic Engineers Conference. IEEE, 2006. http://dx.doi.org/10.1109/ofc.2006.215509.

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Wu, R., C. M. Long, E. Hamidi, V. R. Supradeepa, M. H. Song, D. E. Leaird et A. M. Weiner. « Microwave Photonic Filters with a Directly Generated Gaussian-shaped Optical Frequency Comb ». Dans Optical Fiber Communication Conference. Washington, D.C. : OSA, 2011. http://dx.doi.org/10.1364/ofc.2011.otha4.

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Adib, Md Mosaddek Hossain, Juned N. Kemal, Christoph Füllner, Md Salek Mahmud, Abderrahim Ramdane, Christian Koos, Wolfgang Freude et Sebastian Randel. « Colorless Coherent Passive Optical Network Using a Frequency Comb Local Oscillator ». Dans Optical Fiber Communication Conference. Washington, D.C. : OSA, 2019. http://dx.doi.org/10.1364/ofc.2019.th3f.4.

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Rapports d'organisations sur le sujet "Optical Frequency Comb (OFC)"

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Ye, Jun. Production, Detection, and Control of Ultracold Molecules via Optical Frequency Combs. Fort Belvoir, VA : Defense Technical Information Center, janvier 2012. http://dx.doi.org/10.21236/ada564142.

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