Bandwidth analysis and improvement of the beam phasing of fiber amplifiers using the stochastic parallel gradient descent algorithm

Zhang, Pu; Liu, Zejin; Ma, Yanxing; Wang, Xiaolin; Ma, Haotong; Xu, Xiaojun

doi:10.1016/j.optlastec.2010.01.016

Cited by 4 publications

(2 citation statements)

References 24 publications

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“…Although the SPGD algorithm has been widely applied, it still has some shortcomings 9 . The control bandwidth of the SPGD algorithm is limited by the response time of the devices.…”

Section: Introductionmentioning

confidence: 99%

Coherent optical link phase noise control based on SPGD algorithm with optimal estimation

Luo,

Zhang,

et al. 2023

6th Optics Young Scientist Summit (OYSS 2023)

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The stochastic parallel gradient descent (SPGD) algorithm is a widely used model-free optimization algorithm in adaptive optical systems. However, when affected by noise, the SPGD algorithm may incorrectly estimate the gradient, resulting in a significant decrease in its performance and limitations in its application in complex environments. To address this issue, this paper introduces the optimal estimation algorithm and adds a self-checking process to the SPGD algorithm, proposing a Kal-SPGD algorithm. The feasibility of the Kal-SPGD algorithm is verified through simulation and experimentation. The experimental results show that compared with the standard SPGD, the use of the Kal-SPGD algorithm can reduce the signal amplitude variance by up to 92.15%. The Kal-SPGD algorithm provides a more favorable control technique for adaptive optical systems.

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“…Although the SPGD algorithm has been widely applied, it still has some shortcomings 9 . The control bandwidth of the SPGD algorithm is limited by the response time of the devices.…”

Section: Introductionmentioning

confidence: 99%

Coherent optical link phase noise control based on SPGD algorithm with optimal estimation

Luo,

Zhang,

et al. 2023

6th Optics Young Scientist Summit (OYSS 2023)

View full text Add to dashboard Cite

show abstract

“…Therefore, the number of combining channels of the CBC can be effectively expanded with good beam quality. Furthermore, the 'sub-aperture' containing several beams can be phase-locked firstly, and then locked with other same 'sub-apertures' to improve the control bandwidth by cascading phase-locking [25]. In order to optimize the CFAC system and perform it well, we need to investigate the influence of some perturbative errors on the CBC theoretically.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive investigation of combining efficiency with a misaligned coherent fiber-optics-array collimator

et al. 2019

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We propose a compact arrangement in a limited space for coherent beam combination, which is convenient to expand to the large-number channels. The presented arrangement for expanding combining channels utilizes the coherent fiber-optics-array collimator (CFAC), which employs a single unitary collimating lens to collimate the array beams, and a prism to adjust the tilt errors to ensure the array beams are projected parallel in a single aperture. We comprehensively investigate the influence of some perturbative errors on coherent combining efficiency with the seven-beam CFAC system. We have theoretically analyzed each type of error tolerance (80% of ideal combining efficiency) in this manuscript. Simulation results show that the errors introduced by edge beams cause the far-field beams to experience destructive interference, constructive interference and separation from the main lobe. The tolerance of the radial error, tangential error, defocus error and angular error of the prism are 0.015%, 0.16 mrad, 0.09% and 0.017%, respectively.

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Phase calibration method of transducer arrays considering acoustic interactions

Chen

2020

2020 IEEE 2nd International Conference on Civil Aviation Safety and Information Technology (ICCASIT

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Bandwidth analysis and improvement of the beam phasing of fiber amplifiers using the stochastic parallel gradient descent algorithm

Cited by 4 publications

References 24 publications

Coherent optical link phase noise control based on SPGD algorithm with optimal estimation

Coherent optical link phase noise control based on SPGD algorithm with optimal estimation

Comprehensive investigation of combining efficiency with a misaligned coherent fiber-optics-array collimator

Phase calibration method of transducer arrays considering acoustic interactions

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