CAJ | 학술논문

自适应光纤耦合器(AFC)是一种可实现高稳定、高效的空间光至光纤耦合的新型自适应光学器件。研究了AFC阵列作为空间激光通信系统接收光端机的可行性。在不同的大气湍流强度下，利用SPGD算法，仿真研究了不同子孔径数AFC阵列的闭环控制过程。研究结果表明，AFC阵列技术可缓解大气湍流影响，改善光纤耦合效率并提高耦合过程的稳定性；当等效接收口径一定时，随着阵列子孔径数的增加，光纤耦合效率及控制算法收敛速率都相应提升。
자괄응광섬우합기(AFC)시일충가실현고은정、고효적공간광지광섬우합적신형자괄응광학기건。연구료AFC진렬작위공간격광통신계통접수광단궤적가행성。재불동적대기단류강도하，이용SPGD산법，방진연구료불동자공경수AFC진렬적폐배공제과정。연구결과표명，AFC진렬기술가완해대기단류영향，개선광섬우합효솔병제고우합과정적은정성；당등효접수구경일정시，수착진열자공경수적증가，광섬우합효솔급공제산법수렴속솔도상응제승。
Adaptive fiber coupler (AFC) is a new kind of fiber-based adaptive-optics device which can achieve high and steady efficiency in coupling laser beam from space into fibers. Analysis on the feasibility of adopting AFC array as receiver in free space laser communications was studied. Simulation research on the closed-loop control process of AFC array with different number of sub-units using SPGD algorithm under different turbulence conditions was achieved. Simulation results show that: (1) adopting AFC array as receiver can realize high and stable coupling efficiency and alleviate the effects of atmospheric turbulences; (2) coupling efficiency and the algorithm convergence rate promote as the number of the array increases, where the equivalent aperture of the receiver is certain.