Chen Chunyi, Yang Huamin, Wang Hui, Tong Shoufeng, Lou Yan
School of Computer Science and Technology, Changchun University of Science and Technology, 7089 Weixing Road, Changchun, 130022, China.
Appl Opt. 2011 Jan 20;50(3):307-12. doi: 10.1364/AO.50.000307.
The efficiency of coupling a plane wave into a single-mode fiber can be reduced by both the aperture obstruction of receivers and the turbulence-induced degradation of optical coherence. Using the Gaussian approximation to the mutual coherence function of the incident optical field, we derived an analytical solution for the fiber-coupling efficiency when a plane wave, propagating through atmospheric turbulence, is received by an annular-aperture receiver and coupled into a single-mode fiber. It is a function of the coupling geometry, the aperture-radius-to-coherence-radius ratio (ARCRR), and the aperture-obstruction parameter. It is found by the numerical optimization method that the optimal coupling geometry depends on both the ARCRR and the aperture-obstruction parameter. The results obtained are useful for analyzing and designing a fiber-coupling system influenced by atmospheric turbulence.
将平面波耦合到单模光纤中的效率会因接收器的孔径阻塞以及湍流引起的光学相干性退化而降低。利用对入射光场互相关函数的高斯近似，我们推导了一个解析解，用于计算当平面波在大气湍流中传播并被环形孔径接收器接收并耦合到单模光纤时的光纤耦合效率。它是耦合几何结构、孔径半径与相干半径之比（ARCRR）以及孔径阻塞参数的函数。通过数值优化方法发现，最优耦合几何结构取决于ARCRR和孔径阻塞参数。所得结果对于分析和设计受大气湍流影响的光纤耦合系统很有用。
