Journal articles on the topic 'Asymmetric couplers'

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1

Sorocki, Jakub, Kamil Staszek, Ilona Piekarz, Krzysztof Wincza, and Slawomir Gruszczynski. "Application of RH and LH sections for reduction of coupling coefficients in two-section asymmetric directional couplers." International Journal of Microwave and Wireless Technologies 8, no. 3 (March 23, 2015): 559–65. http://dx.doi.org/10.1017/s1759078715000410.

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A method allowing for reduction of coupling coefficients required for realization of two-section asymmetrical coupled-line directional couplers has been proposed. It has been shown that by connecting uncoupled left-handed and right-handed transmission lines between two coupled-line sections one can obtain greater design flexibility of the resulting circuit, simultaneously with the coupling reduction in coupled-line sections. Moreover, the proposed circuit features the properties of two-section asymmetric directional couplers offering wide operational bandwidth. The theoretical analysis has been verified by measurements of a 3 dB directional coupler operating at the center frequency f0 = 1.5 GHz having coupling imbalance δC = ±0.4 dB and bandwidth 0.75–2.3 GHz.
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2

Griffin, R., J. D. Love, P. R. A. Lyons, D. A. Throncraft, and S. C. Rashleigh. "Asymmetric multimode couplers." Journal of Lightwave Technology 9, no. 11 (1991): 1508–17. http://dx.doi.org/10.1109/50.97639.

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3

Chen, Y. "Asymmetric triple-core couplers." Optical and Quantum Electronics 24, no. 5 (May 1992): 539–53. http://dx.doi.org/10.1007/bf00619753.

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4

Chen, Y. "Corrigendum: ?Asymmetric triple-core couplers?" Optical and Quantum Electronics 27, no. 8 (August 1995): 765. http://dx.doi.org/10.1007/bf00576729.

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5

Wincza, Krzysztof, Ilona Piekarz, and Slawomir Gruszczynski. "Two‐section asymmetric coupled‐line impedance transforming directional couplers." IET Microwaves, Antennas & Propagation 9, no. 4 (March 2015): 343–50. http://dx.doi.org/10.1049/iet-map.2014.0338.

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6

Hardy, A., E. Marom, and Y. Shama. "Power transfer in asymmetric multiport couplers." Applied Optics 27, no. 3 (February 1, 1988): 447. http://dx.doi.org/10.1364/ao.27.000447.

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7

Marcuse, D. "Directional couplers made of nonidentical asymmetric slabs. Part I: Synchronous couplers." Journal of Lightwave Technology 5, no. 1 (1987): 113–18. http://dx.doi.org/10.1109/jlt.1987.1075399.

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8

Marcuse, D. "Directional couplers made of nonidentical asymmetric slabs. Part II: Grating-assisted couplers." Journal of Lightwave Technology 5, no. 2 (1987): 268–73. http://dx.doi.org/10.1109/jlt.1987.1075493.

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9

Schneider, Vitor Marino, and Haroldo T. Hattori. "Wavelength insensitive asymmetric triple mode evolution couplers." Optics Communications 187, no. 1-3 (January 2001): 129–33. http://dx.doi.org/10.1016/s0030-4018(00)01088-9.

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10

Hong, J., and W. P. Huang. "Asymmetric power coupling in grating-assisted couplers." IEE Proceedings - Optoelectronics 142, no. 2 (April 1, 1995): 103–8. http://dx.doi.org/10.1049/ip-opt:19951546.

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11

Venugopal, Gayatri, Zhaxylyk Kudyshev, and Natalia M. Litchinitser. "Asymmetric Positive-Negative Index Nonlinear Waveguide Couplers." IEEE Journal of Selected Topics in Quantum Electronics 18, no. 2 (March 2012): 753–56. http://dx.doi.org/10.1109/jstqe.2011.2129494.

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12

Madore, Wendy-Julie, Etienne De Montigny, Olivier Ouellette, Simon Lemire-Renaud, Mikael Leduc, Xavier Daxhelet, Nicolas Godbout, and Caroline Boudoux. "Asymmetric double-clad fiber couplers for endoscopy." Optics Letters 38, no. 21 (October 31, 2013): 4514. http://dx.doi.org/10.1364/ol.38.004514.

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13

Shafir, E., A. Hardy, and M. Tur. "Asymmetric behavior of polished polarization-maintaining couplers." Optics Letters 15, no. 24 (December 15, 1990): 1440. http://dx.doi.org/10.1364/ol.15.001440.

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14

Sychev, A. N., V. A. Bondar, K. K. Zharov, V. V. Anisimov, K. B. B. Dagba, and A. I. Stepanyuga. "Coupled lines with double shields for microwave hybrids of various types of directivity with transforming properties." Proceedings of Tomsk State University of Control Systems and Radioelectronics 23, no. 3 (September 25, 2020): 13–25. http://dx.doi.org/10.21293/1818-0442-2020-23-3-13-25.

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Asymmetric coupled double-shielded lines in an inhomogeneous dielectric medium, which have special properties that allow us to create microwave hybrids of a given directionality type are investigated. For the first time, a new model and method of synthesis are proposed, which takes into account both the asymmetry and the inhomogeneity of the dielectric, which makes it possible to synthesize co-, counter- and transdirectional couplers that have both the transforming and required phase properties. The research results will be useful for finding new design solutions of the next generation microwave circuits.
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15

Borges, B. H. V., and P. R. Herczfeld. "Coupled-mode analysis of highly asymmetric directional couplers with periodic perturbation." IEEE Transactions on Microwave Theory and Techniques 46, no. 3 (March 1998): 215–26. http://dx.doi.org/10.1109/22.661706.

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16

Yanagawa, H., S. Nakamura, I. Ohyama, and K. Ueki. "Broad-band high-silica optical waveguide star coupler with asymmetric directional couplers." Journal of Lightwave Technology 8, no. 9 (1990): 1292–97. http://dx.doi.org/10.1109/50.59155.

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17

de Almeida, J. S., J. W. M. Menezes, M. G. Da Silva, A. S. B. Sombra, W. B. Fraga, J. C. Sales, A. C. Ferreira, S. P. Marciano, and A. F. G. F. Filho. "Logic Gates Based in Asymmetric Couplers: Numerical Analysis." Fiber and Integrated Optics 26, no. 4 (June 28, 2007): 217–28. http://dx.doi.org/10.1080/01468030701347072.

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18

Yoo, Bo-Yoon, Jae-Hyun Park, and Jong-Ryul Yang. "Quasi-Circulator Using an Asymmetric Coupler for Tx Leakage Cancellation." Electronics 7, no. 9 (September 1, 2018): 173. http://dx.doi.org/10.3390/electronics7090173.

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A quasi-circulator is proposed by using an asymmetric coupler with high isolation between the transmitting (Tx) and receiving (Rx) ports. The proposed quasi-circulator consists of quarter-wave transmission lines, which have unbalanced characteristic impedances and the terminated port, which is purposely unmatched with the reference impedance in the coupler. The port compensates for the asymmetric impedances of the coupler using the proposed design parameter. Because of its asymmetric structure and the usage of the unmatched port, the proposed circulator can be accurately designed to have high Tx–Rx isolation without increasing the signal losses in the Tx and Rx paths at the operating frequency. The proposed quasi-circulators show isolation improvements of 9.07 dB at 2.45 GHz and 7.95 dB at 24.125 GHz compared with conventional circulators using the symmetric couplers. The characteristic improvement of the proposed quasi-circulator was demonstrated by the increase of the detectable range of the 2.45 GHz Doppler radar sensor with the quasi-circulator.
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19

Huang, Quandong, Yunfei Wu, Wei Jin, and Kin Seng Chiang. "Mode Multiplexer With Cascaded Vertical Asymmetric Waveguide Directional Couplers." Journal of Lightwave Technology 36, no. 14 (July 15, 2018): 2903–11. http://dx.doi.org/10.1109/jlt.2018.2829143.

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20

Lupu, Anatole, Kamal Muhieddine, Eric Cassan, and Jean-Michel Lourtioz. "Dual transmission band Bragg grating assisted asymmetric directional couplers." Optics Express 19, no. 2 (January 11, 2011): 1246. http://dx.doi.org/10.1364/oe.19.001246.

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21

Touam, Tahar, and S. Iraj Najafi. "Symmetric profile beams from waveguides with asymmetric grating couplers." Applied Optics 36, no. 12 (April 20, 1997): 2554. http://dx.doi.org/10.1364/ao.36.002554.

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22

Peřina, J., and J. Bajer. "Non-classical Light in Nonlinear Symmetric and Asymmetric Couplers." Journal of Modern Optics 42, no. 11 (November 1995): 2337–46. http://dx.doi.org/10.1080/09500349514552031.

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23

Song, Jeong Hwan, and Xavier Rottenberg. "Low-Back-Reflection Grating Couplers Using Asymmetric Grating Trenches." IEEE Photonics Technology Letters 29, no. 4 (February 15, 2017): 389–92. http://dx.doi.org/10.1109/lpt.2017.2650558.

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24

Høvik, Jens, Mukesh Yadav, Jong Wook Noh, and Astrid Aksnes. "Waveguide asymmetric long-period grating couplers as refractive index sensors." Optics Express 28, no. 16 (July 29, 2020): 23936. http://dx.doi.org/10.1364/oe.397561.

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25

Pelegrina-Bonilla, Gabriel, Katharina Hausmann, Henrik Tunnermann, Peter Wesels, Hakan Sayinc, Uwe Morgner, Jorg Neumann, and Dietmar Kracht. "Analysis of the Coupling Mechanism in Asymmetric Fused Fiber Couplers." Journal of Lightwave Technology 32, no. 13 (July 1, 2014): 2382–91. http://dx.doi.org/10.1109/jlt.2014.2325593.

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26

Yan, Ting-Ting, Wen-Hua Ren, and You-Chao Jiang. "Asymmetric Wavelength-Selective Directional Couplers as Fractional-Order Optical Differentiators." IEEE Access 7 (2019): 56533–38. http://dx.doi.org/10.1109/access.2019.2913758.

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27

Zhu, Lin, Junqiang Sun, and Yong Zhou. "Silicon-based wavelength division multiplexer using asymmetric grating-assisted couplers." Optics Express 27, no. 16 (July 30, 2019): 23234. http://dx.doi.org/10.1364/oe.27.023234.

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28

Chuang, Wei-Ching, An-Chen Lee, Ching-Kong Chao, and Chi-Ting Ho. "Fabrication of optical filters based on polymer asymmetric Bragg couplers." Optics Express 17, no. 20 (September 23, 2009): 18003. http://dx.doi.org/10.1364/oe.17.018003.

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29

Syms, R. R. A. "Asymmetric switch response of three-arm directional couplers in Ti:LiNbO3." Optics Communications 64, no. 3 (November 1987): 248–52. http://dx.doi.org/10.1016/0030-4018(87)90386-5.

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30

He, Xiujun, Kang Xie, and Anping Xiang. "Optical solitons switching in asymmetric dual-core nonlinear fiber couplers." Optik 122, no. 14 (July 2011): 1222–24. http://dx.doi.org/10.1016/j.ijleo.2010.07.027.

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31

Dai, Daoxin, and Shipeng Wang. "Asymmetric directional couplers based on silicon nanophotonic waveguides and applications." Frontiers of Optoelectronics 9, no. 3 (September 2016): 450–65. http://dx.doi.org/10.1007/s12200-016-0557-8.

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32

Kazazis, S., and E. Paspalakis. "Effects of nonlinearity in asymmetric adiabatic three-waveguide directional couplers." Journal of Modern Optics 57, no. 21 (December 10, 2010): 2123–29. http://dx.doi.org/10.1080/09500340.2010.524316.

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33

Han, Yu, Zanhui Chen, Leiyun Wang, Wenying Li, Haisong Jiang, and Kiichi Hamamoto. "Asymmetric-ration optical power couplers based on nano-pixel structure." OSA Continuum 4, no. 2 (February 1, 2021): 556. http://dx.doi.org/10.1364/osac.412933.

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34

Wincza, Krzysztof, and Slawomir Gruszczynski. "Asymmetric Coupled-Line Directional Couplers as Impedance Transformers in Balanced and $n$-Way Power Amplifiers." IEEE Transactions on Microwave Theory and Techniques 59, no. 7 (July 2011): 1803–10. http://dx.doi.org/10.1109/tmtt.2011.2141677.

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35

Li, Qiliang, Aixin Zhang, and Xiaofeng Hua. "Numerical simulation of solitons switching and propagating in asymmetric directional couplers." Optics Communications 285, no. 2 (January 2012): 118–23. http://dx.doi.org/10.1016/j.optcom.2011.09.003.

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36

Chan, Hau-Ping, Po-Sheun Chungs, and Edwin Yun-Bun Pun. "Design of 3-dB Integrated Optical Couplers in Asymmetric Branching Waveguides." Japanese Journal of Applied Physics 31, Part 1, No. 5B (May 30, 1992): 1641–42. http://dx.doi.org/10.1143/jjap.31.1641.

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37

Yang, C. C. "All-optical ultrafast logic gates that use asymmetric nonlinear directional couplers." Optics Letters 16, no. 21 (November 1, 1991): 1641. http://dx.doi.org/10.1364/ol.16.001641.

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38

Delâge, A., S. Janz, B. Lamontagne, A. Bogdanov, D. Dalacu, D. X. Xu, and K. P. Yap. "Monolithically integrated asymmetric graded and step-index couplers for microphotonic waveguides." Optics Express 14, no. 1 (2006): 148. http://dx.doi.org/10.1364/opex.14.000148.

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39

Kim, Boo-Gyoun, Ali Shakouri, Bin Liu, and John E. Bowers. "Improved Extinction Ratio in Ultra Short Directional Couplers Using Asymmetric Structures." Japanese Journal of Applied Physics 37, Part 2, No. 8A (August 1, 1998): L930—L932. http://dx.doi.org/10.1143/jjap.37.l930.

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40

Lerner, L. "Calculation of modal power transfer in tapered asymmetric single mode couplers." Optics Communications 100, no. 5-6 (July 1993): 431–36. http://dx.doi.org/10.1016/0030-4018(93)90240-6.

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41

Govindaraji, A., A. Mahalingam, and A. Uthayakumar. "Numerical investigation of dark soliton switching in asymmetric nonlinear fiber couplers." Applied Physics B 120, no. 2 (May 29, 2015): 341–48. http://dx.doi.org/10.1007/s00340-015-6142-9.

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42

Wang, Xiao-Min, Ling-Ling Zhang, and Xiao-Xiao Hu. "Various types of vector solitons for the coupled nonlinear Schrödinger equations in the asymmetric fiber couplers." Optik 219 (October 2020): 164989. http://dx.doi.org/10.1016/j.ijleo.2020.164989.

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43

Hsu, Fang Chang, Che Yi Liao, Xiao Han Yu, Xuan Ming Lai, and Chi Ting Ho. "The Effect of the Different Core Layer on Polymer Asymmetric Bragg Couplers." Applied Mechanics and Materials 284-287 (January 2013): 2821–25. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.2821.

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In this work, we successfully developed a process to fabricate dual-channel polymeric waveguide filters based on an asymmetric Bragg coupler using holographic interference techniques, soft lithography, and micro molding. At the cross- and self-reflection Bragg wavelengths, the transmission dips of approximately –16.5 and –11.7dB relative to the 3dB background insertion loss and the 3dB transmission bandwidths of approximately 0.6 and 0.5nm were obtained from an ABC-based filter. The transmission spectrum overlaps when the effective index difference between two single waveguides is less than 0.0025.
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44

Kim, C. M., and R. V. Ramaswamy. "WKB analysis of asymmetric directional couplers and its application to optical switches." Journal of Lightwave Technology 6, no. 6 (June 1988): 1109–18. http://dx.doi.org/10.1109/50.4103.

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45

Hsu, Wei-Feng, Yi-Ta Shen, and I.-Lin Chu. "Asymmetric and symmetric light couplers of daylighting systems for direct indoor lighting." Journal of Optics 14, no. 12 (October 9, 2012): 125703. http://dx.doi.org/10.1088/2040-8978/14/12/125703.

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46

Dano, Lemi Bedjisa, San-Liang Lee, and Wen-Hsien Fang. "Simplified Approach for Optimizing Optical Asymmetric Curved Waveguides of Broadband Directional Couplers." Fiber and Integrated Optics 38, no. 5 (September 3, 2019): 285–303. http://dx.doi.org/10.1080/01468030.2019.1659460.

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47

Ahmmed, Kazi Tanvir, Hau Ping Chan, and Binghui Li. "Scalable selective high order mode pass filter architecture with asymmetric directional couplers." Optics Express 28, no. 19 (September 9, 2020): 28465. http://dx.doi.org/10.1364/oe.402751.

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48

Chee-Wei Lee, M. K. Chin, M. K. Iyer, and A. Popov. "Asymmetric waveguides vertical couplers for polarization-independent coupling and polarization-mode splitting." Journal of Lightwave Technology 23, no. 4 (April 2005): 1818–27. http://dx.doi.org/10.1109/jlt.2005.844490.

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49

Khani, Shiva, Mohammad Danaie, and Pejman Rezaei. "All-Optical Plasmonic Switches Based on Asymmetric Directional Couplers Incorporating Bragg Gratings." Plasmonics 15, no. 3 (December 20, 2019): 869–79. http://dx.doi.org/10.1007/s11468-019-01106-5.

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50

Gruszczynski, Slawomir, and Krzysztof Wincza. "Generalized Methods for the Design of Quasi-Ideal Symmetric and Asymmetric Coupled-Line Sections and Directional Couplers." IEEE Transactions on Microwave Theory and Techniques 59, no. 7 (July 2011): 1709–18. http://dx.doi.org/10.1109/tmtt.2011.2138155.

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