Experimental demonstration of single-mode fiber coupling using adaptive fiber coupler

Luo, Wen; Geng, Chao; Yun-Yun, Wu; Tan, Yang; Qinghong, Luo; Liu, Hongmei; Li, Xinyang

doi:10.1088/1674-1056/23/1/014207

Cited by 22 publications

(10 citation statements)

References 16 publications

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“…4 (a) The results indicate that the efficiency of coupling laser beam with distorted wave-front from space into PMF can be effectively promoted through tip/tilt error control with AFOCs. Results achieved above agree with outcomes in reference [6]. Received by AFOC-2.…”

Section: Resultssupporting

confidence: 89%

“…To the best of our knowledge, most of present researches are focused on fiber laser array emission, and thus little attentions have been paid on the reception issues. In 2013, IOE puts forward a technique of adaptive fiber coupling [6] with modified AFOC based on the principle of optical reciprocity for improving single-mode fiber (SMF) coupling efficiency. For laser beam with random angular jitters, the SMF coupling efficiency can be improved with active tip/tilt phase error control [6]- [7].…”

Section: Introductionmentioning

confidence: 99%

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Co-Aperture Transceiving of Two Combined Beams Based on Adaptive Fiber Coupling Control

Geng

et al. 2015

IEEE Photon. Technol. Lett.

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 Abstract-We demonstrate the reception and transmission of fiber laser beams using two-element adaptive fiber-optics collimator (AFOC) array under simulated turbulences. Coupling efficiency of laser beam from free space into polarization maintaining fibers is optimized with tip/tilt aberration correction. According to the principle of optical reciprocity, tip/tilt errors of the phase-conjugated collimating laser beams are compensated simultaneously. The average of normalized coupling efficiency of one AFOC increases from 0.61 without control to 0.85 under control and 0.57 to 0.85 for another. The average of diffraction-pattern centroid's deviation of two outgoing combined beams in the far-field drops from 17.5 μrad to 2.35 μrad, and mean-square-error value drops from 6.59 μrad to 1.35 μrad. Control bandwidth of 30 Hz for tip/tilt correction is achieved with computer-based stochastic parallel gradient descent controller with update rate of 1.15 kHz. Results indicate the potential value of the AFOC array in fiber coupling, laser communication and beam projection applications.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Co-Aperture Transceiving of Two Combined Beams Based on Adaptive Fiber Coupling Control

Geng

et al. 2015

IEEE Photon. Technol. Lett.

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“…Sub-aperture slope could be obtained through control of coupling the focused laser beam from space into single mode fiber [22]. It has been proved through experiments [30], [31] that subaperture tip/tilt phase of the outgoing laser beam could be corrected when power of coupled laser beacon from space into SMF is optimized. When the recovered pistons are loaded and pre-compensated through the fiber compensators shown in Fig.…”

Section: Active Pre-compensation Modelmentioning

confidence: 99%

Experimental Demonstration of Adaptive Optics Correction of the External Aberrations for Distributed Fiber Laser Array

Geng

Zou

et al. 2021

IEEE Access

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A novel method of pre-compensating the phase distortions outside the fiber laser array based on active integrated wavefront sensing is proposed and demonstrated experimentally. The scheme and the working principle are introduced. Pre-compensation experiment of the fiber laser array based on a 7-element adaptive fiber optics collimator (AFOC) array with filled factor of 0.875 is presented. Residual error RMS of 0.11μm is obtained while sensing lower order aberrations of a glass plate is with initial RMS of 0.62μm. Metric of far-field power-in-the-bucket (PIB) is improved about 3.5 times after the phase distortions are pre-compensated. This method could promote the transmission efficiency of the fiber laser array in atmosphere, without limits of array scale and transmission light delay. This method would be upgraded to correct the aberrations located in the whole optical link from laser source to the target in the future. Such method would highly promote the applications of fiber laser array based systems like free space laser communication.

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“…In [12] a fast-steering mirror that can operate at high frequencies under atmospheric turbulence was fabricated to increase fiber-coupling efficiency, but the two sub-optical paths structure was complex and easy to introduce artificial errors. In [13] a new adaptive-optic device named adaptive fiber coupler (AFC), which could compensate angular jitters and improve the SMF coupling efficiency in some degree, was verified. But the control bandwidth is only about 20 Hz under atmospheric turbulence.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Single-Mode Fiber Coupling Method Based on Coarse-Fine Laser Nutation

Liu²,

Tong

et al. 2018

IEEE Photonics J.

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One of the major restrictions of the free-space optical communication systems is the limitation of single-mode fiber (SMF) coupling efficiency that impacts the system performance. In this paper, an adaptive coupling method for optical communication system based on coarse-fine laser nutation technique was presented. The scanning strategy and algorithm were set up and experimentally examined. The experimental results demonstrate that the coarse-fine laser nutation technique is capable of achieving a good coupling efficiency even the beam spot and the SMF do not coincide with each other at the start. The SMF center calculation accuracy of coarse and fine scanning stage were 0.25 and 0.01 μm, respectively. And the average coupling efficiency of the system can increase from 0.351 in open loop to 0.624 in closed loop under a simulated atmospheric turbulence condition, the offset compensation error was 0.1245 μm when turbulence induced. Finally, some factors influencing the systems were also discussed.

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Experimental demonstration of single-mode fiber coupling using adaptive fiber coupler

Abstract: Experimental demonstration of single-mode fiber coupling using adaptive fiber coupler) , and Li Xin-Yang(李新阳) a)b) †

Cited by 22 publications

References 16 publications

Co-Aperture Transceiving of Two Combined Beams Based on Adaptive Fiber Coupling Control

Co-Aperture Transceiving of Two Combined Beams Based on Adaptive Fiber Coupling Control

Experimental Demonstration of Adaptive Optics Correction of the External Aberrations for Distributed Fiber Laser Array

Adaptive Single-Mode Fiber Coupling Method Based on Coarse-Fine Laser Nutation

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