Adaptive stochastic parallel gradient descent approach for efficient fiber coupling

Hu, Qintao; Zhen, Liangli; Mao, Yao; Zhu, Shiwei; Zhou, Xi; Zhou, Guomei

doi:10.1364/oe.390762

Cited by 40 publications

(12 citation statements)

References 24 publications

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“…The feedback control of phase shifters to maximize the combiner output will require further studies, which is beyond the scope of this investigation. An efficient optimization algorithm, such as stochastic parallel gradient descent, 18 can be considered.…”

Section: Discussionmentioning

confidence: 99%

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Investigation of turbulence-tolerant free-space optical communications via multiplane light conversion

Cho¹,

Pellegrino

Bickford

et al. 2022

Opt. Eng.

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Multiplane light conversion (MPLC) offers an alternative to adaptive optics for coupling a turbulence-corrupted free-space optical beam into single-mode fiber or waveguide. Recent published test results suggest that such a conversion device has comparable or better performance than an adaptive optics system. To better understand the device characteristics, simulations were conducted to quantify the power loss for different turbulence strengths and the number of Hermite-Gaussian modes used in the conversion process. The specific case studied is a prototype free-space laser communication system developed by the U.S. Army Research Laboratory. Simulation and statistical results of the conversion performance are reported. Analysis of a beam power combiner after MPLC is also discussed.

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Section: Discussionmentioning

confidence: 99%

“…A feedback control loop (e.g., Ref. 18) that maximizes the combiner output can be used to drive the phase shifters array, which is not considered here.…”

Section: Power Combinermentioning

confidence: 99%

Investigation of turbulence-tolerant free-space optical communications via multiplane light conversion

Cho¹,

Pellegrino

Bickford

et al. 2022

Opt. Eng.

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“…ADGD does not need to set the step size manually. The step size can be updated for different cost functions according to the exponential weighted moving square sum of parameter changes and the exponential weighted moving square sum of gradients [27], [28]. The algorithm of using ADGD to solve the pitch angle and azimuth angle of the spoofer is shown in the following table.…”

Section: Spoofing Orientation Algorithm a Calculate The Observed Valu...mentioning

confidence: 99%

Detection and Orientation of GNSS Spoofing Based on Positioning Solutions of Three Receivers

Chen

Cheng

et al. 2023

IEEE Access

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Spoofing poses a serious security threat to the satellite navigation system. Most of the current spoofing detection methods are based on the information in the receiver-solving process. Applying the above spoofing detection algorithm on the receiver requires a redesign of the original receiver, which limits the application of the deceptive detection method on the ex-factory receiver. In the case of single-station spoofing, the positions of the successfully spoofed multiple receivers are the same according to the deception signal, but the clock offset is different. The single-difference clock offset is positively correlated with the distance between the two receivers. Based on the above principles, this paper proposes a spoofing detection and spoofing direction method based on the positioning solutions of three receivers. The observation value of the baseline length is calculated from the position information in the positioning solution, and spoofing detection is realized by hypothesis testing. The clocks of the three receivers are synchronized. The Adaptive Delta Gradient Descent(ADGD) method is adopted to calculate the spoofing direction according to the single-difference clock offset in the positioning solution. The direction angle is optimized through the Interacting Multiple Model based on the volume Kalman Filter. The relationship between several parameters and the direction accuracy of spoofing is analyzed through simulation tests. Experimental results show that this method can effectively detect and orient spoofing. In addition, the detection and orientation method of spoofing has the advantage of fast response speed, which can realize fast spoofing detection and direction finding in a deception environment.

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“…To obtain a higher and more stable coupling efficiency, adaptive *Corresponding author, e-mail: w_zt@163.com optics has been verified an effective scheme and has been commonly used in optical signal receiver. Long Li et al have applied a fast steering mirror (FSM) to steer the signal laser into the detection field of view of SMF in recent years [11][12][13] .…”

Section: Introductionmentioning

confidence: 99%

Enlarging field of view in free space optical signal receiver via pump and signal combiner

Luo

et al. 2023

Advanced Fiber Laser Conference (AFL2022)

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Optical signal receiver is a crucial element in free space optical communication (FSOC) system. Single-mode fiber (SMF) is commonly utilized in receivers for connecting with the subsequent optical fiber communication devices. However, the conventional SMF's tiny core size and the random drift of the signal laser's optical axis cause small field of view, and the optical signal acquisition and coupling issues was limited. Herein, a wide field of view optical signal receiver via pump and signal combiner was proposed and demonstrated. The experimental results show that the detection field of view of the pump and signal combiner with a 20/400 μm double-clad fiber increased about 40 times, compared with using a 6/125 μm SMF. Additionally, with the home-build adaptive fiber tip controller, the wide detection field of view can further improve the stability of optical signal receiving in the dynamic optical signal receiving system.

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Adaptive stochastic parallel gradient descent approach for efficient fiber coupling

Cited by 40 publications

References 24 publications

Investigation of turbulence-tolerant free-space optical communications via multiplane light conversion

Investigation of turbulence-tolerant free-space optical communications via multiplane light conversion

Detection and Orientation of GNSS Spoofing Based on Positioning Solutions of Three Receivers

Enlarging field of view in free space optical signal receiver via pump and signal combiner

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