ESPGD Algorithm to Improve the Convergence Speed for Adaptive Single-Mode Fiber Coupling
The adaptive single-mode fiber (SMF) coupling technique is normally adopted since the coupling efficiency (CE) significantly determines the performance of the free-space optical communication (FSOC) systems. The stochastic parallel gradient descent (SPGD) algorithm is the most commonly used control...
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IEEE
2024-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/10707185/ |
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| author | Jinjin Peng Bo Qi Yun Zhang ZhenChuang Li Yao Mao |
| author_facet | Jinjin Peng Bo Qi Yun Zhang ZhenChuang Li Yao Mao |
| author_sort | Jinjin Peng |
| collection | DOAJ |
| description | The adaptive single-mode fiber (SMF) coupling technique is normally adopted since the coupling efficiency (CE) significantly determines the performance of the free-space optical communication (FSOC) systems. The stochastic parallel gradient descent (SPGD) algorithm is the most commonly used control algorithm in adaptive SMF fiber coupling system. This paper proposes an improved SPGD algorithm named estimation-based stochastic parallel gradient descent (ESPGD) algorithm to accelerate the sytem convergence when applied to a practical adaptive SMF coupling system based on fast steering mirror (FSM). Applying the perturbed voltages, FSM dynamic response and then recording the performance metrics is the basic and most time-consuming process in actual adaptive SMF coupling system control. The ESPGD algorithm uses a different gradient estimation method based on adaptive parameter estimation method. The algorithm only needs to perform this process once in one iteration while the original SPGD algorithm needs to perform it twice to obtain the estimated gradient. This greatly reduce the time consumed by one iteration of the algorithm, thereby reducing the convergence time. The simulation and experimental results show that the ESPGD algorithm reduces the system convergence time by nearly half when correcting static angular errors and more than doubles the control bandwidth when correcting sinusoidal angular jitters. |
| format | Article |
| id | doaj-art-ad7b1c3d56e843e4a0e011e6a044ef51 |
| institution | Kabale University |
| issn | 1943-0655 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj-art-ad7b1c3d56e843e4a0e011e6a044ef512025-01-24T00:00:50ZengIEEEIEEE Photonics Journal1943-06552024-01-011661710.1109/JPHOT.2024.347619910707185ESPGD Algorithm to Improve the Convergence Speed for Adaptive Single-Mode Fiber CouplingJinjin Peng0Bo Qi1https://orcid.org/0000-0003-2142-8113Yun Zhang2https://orcid.org/0000-0003-4509-9086ZhenChuang Li3https://orcid.org/0009-0005-2890-1120Yao Mao4https://orcid.org/0000-0003-1785-2018Institute of Optics and Electronics and Key Laboratory of Optical Engineering, Chinese Academy of Science, Chengdu, ChinaInstitute of Optics and Electronics and Key Laboratory of Optical Engineering, Chinese Academy of Science, Chengdu, ChinaInstitute of Optics and Electronics and Key Laboratory of Optical Engineering, Chinese Academy of Science, Chengdu, ChinaInstitute of Optics and Electronics and Key Laboratory of Optical Engineering, Chinese Academy of Science, Chengdu, ChinaInstitute of Optics and Electronics and Key Laboratory of Optical Engineering, Chinese Academy of Science, Chengdu, ChinaThe adaptive single-mode fiber (SMF) coupling technique is normally adopted since the coupling efficiency (CE) significantly determines the performance of the free-space optical communication (FSOC) systems. The stochastic parallel gradient descent (SPGD) algorithm is the most commonly used control algorithm in adaptive SMF fiber coupling system. This paper proposes an improved SPGD algorithm named estimation-based stochastic parallel gradient descent (ESPGD) algorithm to accelerate the sytem convergence when applied to a practical adaptive SMF coupling system based on fast steering mirror (FSM). Applying the perturbed voltages, FSM dynamic response and then recording the performance metrics is the basic and most time-consuming process in actual adaptive SMF coupling system control. The ESPGD algorithm uses a different gradient estimation method based on adaptive parameter estimation method. The algorithm only needs to perform this process once in one iteration while the original SPGD algorithm needs to perform it twice to obtain the estimated gradient. This greatly reduce the time consumed by one iteration of the algorithm, thereby reducing the convergence time. The simulation and experimental results show that the ESPGD algorithm reduces the system convergence time by nearly half when correcting static angular errors and more than doubles the control bandwidth when correcting sinusoidal angular jitters.https://ieeexplore.ieee.org/document/10707185/Adaptive estimationconvergence speedestimation-based stochastic parallel gradient descent (ESPGD) algorithmsingle-mode fiber coupling |
| spellingShingle | Jinjin Peng Bo Qi Yun Zhang ZhenChuang Li Yao Mao ESPGD Algorithm to Improve the Convergence Speed for Adaptive Single-Mode Fiber Coupling IEEE Photonics Journal Adaptive estimation convergence speed estimation-based stochastic parallel gradient descent (ESPGD) algorithm single-mode fiber coupling |
| title | ESPGD Algorithm to Improve the Convergence Speed for Adaptive Single-Mode Fiber Coupling |
| title_full | ESPGD Algorithm to Improve the Convergence Speed for Adaptive Single-Mode Fiber Coupling |
| title_fullStr | ESPGD Algorithm to Improve the Convergence Speed for Adaptive Single-Mode Fiber Coupling |
| title_full_unstemmed | ESPGD Algorithm to Improve the Convergence Speed for Adaptive Single-Mode Fiber Coupling |
| title_short | ESPGD Algorithm to Improve the Convergence Speed for Adaptive Single-Mode Fiber Coupling |
| title_sort | espgd algorithm to improve the convergence speed for adaptive single mode fiber coupling |
| topic | Adaptive estimation convergence speed estimation-based stochastic parallel gradient descent (ESPGD) algorithm single-mode fiber coupling |
| url | https://ieeexplore.ieee.org/document/10707185/ |
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