Coupling analysis of non-circular-symmetric modes and design of orientation-insensitive few-mode fiber couplers

• Published in: Optics communications Vol. 383; pp. 42 - 49
• Main Authors: Li, Jiaxiong, Du, Jiangbing, Ma, Lin, Li, Ming-Jun, Jiang, Shoulin, Xu, Xiao, He, Zuyuan
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.01.2017
• Subjects: Few-mode fiber couplers; Mode multiplexer/demultiplexer and mode-division multiplexing; Non-circular-symmetric modes; Non-circular-symmetric modes; Mode multiplexer/demultiplexer and mode-division multiplexing; Few-mode fiber couplers

We study the coupling between two identical weakly-coupled few-mode fibers based on coupled-mode theory. The coupling behavior of non-circular-symmetric modes, such as LP11 and LP21, is investigated analytically and numerically. By carefully choosing the fiber core separation and coupler length, we...