Work

Impact of random birefringence on nonlinear ultrashort pulse propagation in multimode fibers

Year: 2025

Type: article

Abstract: Nonlinear pulse propagation in multimode fibers (MMFs) has attracted considerable attention in recent years, owing to its rich spatiotemporal nonlinear dynamics and diverse potential applications. In practical scenarios, random birefringence in MMFs cannot be neglected, affecting the polarization-dependent nonlinear pulse propagation. This paper explores the impact of random birefringence in MMFs on the nonlinear ultrashort pulse propagation employing the generalized multimode nonlinear Schrödinger equation combined with random birefringence. Two scenarios, multimode soliton propagation and spatial beam self-cleaning, are specifically examined. It is found that while random birefringence typically weakens nonlinearity in MMFs, certain nonlinear processes may exhibit a complex relationship with random birefringence. For the soliton self-frequency shift induced by the intra-pulse Raman effect, we found that as the randomness of the birefringence effect increases, the general trend of the frequency shift is first to decrease and then increase. The study also reveals that beam self-cleaning can endure random birefringence at high input peak powers. This research provides guidance for practical applications that utilize the nonlinear transmission of ultrashort pulses in MMFs.

Source: Optics Express

DOI: 10.1364/oe.576472

Authors: Chaoyang Geng, Hengyu Liu, Xianfeng Tang, Lixia Xi, Xiaoguang Zhang, Xiaosheng Xiao

Language: English

Topic: Photonic Crystal and Fiber Optics

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funders: National Natural Science Foundation of China, Beijing University of Posts and Telecommunications

Awards: G6458913339, G8200000548