Coupling plane wave received by an annular aperture into a single-mode fiber in the presence of atmospheric turbulence.
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.
School of Computer Science and Technology, Changchun University of Science and Technology, 7089 Weixing Road, Changchun, 130022, China. chenchunyi@hotmail.com
Chunyi
C
Chen
Huamin
H
Yang
Hui
H
Wang
Shoufeng
S
Tong
Yan
Y
Lou