The Design and Research of High-Order Mode Field Generation Based on Asymmetric Dual-Core Fibers
The infinite orthogonality between high-order modes provides a novel solution to increase the capacity of the optical fiber communication system.The generation of high-order modes based on optical fiber has gradually become a research hotspot.Based on the phase-matching principle,a design for generating high-order modes based on asymmetric dual-core fibers is proposed.The fusion splicing of a single-mode fiber with an asymmetric dual-core fiber,followed by fusion splicing with a few-mode fiber,is utilized to achieve direct mode conversion from the fundamental mode to specific high-order modes within the dual-core fiber.Taking the dual-core fiber with a small core diameter of 8µm as an example,the operating bandwidth which coupling efficiency is over 95%(LP11)and 90%(LP21,LP02)from the fundamental mode to LP11,LP21,and LP02 modes is 202,54 and 60µm,respectively,in the S+C+L wavelength band.This method of directly generating high-order modes in an all-fiber structure has wider operating bandwidth and higher stability,which is more suitable for high-capacity,and wide-band fiber communication systems.
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维普
