Pang Aodi, Hu Guijun, Qin Yi, Wang Haiyan
Appl Opt. 2023 Sep 10;62(26):7044-7049. doi: 10.1364/AO.500207.
Mode-division multiplexing communication based on few-mode fibers (FMFs) is the most competitive scheme to address the bandwidth exhaustion in single-mode fibers. The differential mode group delay (DMGD) among different modes in FMFs is an important aspect in characterizing FMFs, and the convenient, fast, and accurate measurement of DMGD in different modes of FMFs is a crucial task. This paper presents a single-ended measurement method for DMGD in FMFs based on Fresnel reflection peaks. Experimental measurements were conducted to determine the DMGD of a 3.689 km six-mode fiber and a 9.7 km three-mode fiber, and the results were compared with the traditional time-of-flight method. The findings demonstrate that our proposed method based on Fresnel reflection peaks exhibits good accuracy in measuring the DMGD of FMFs. Moreover, this method enables single-ended measurement and offers simplicity and practicality.
基于少模光纤（FMF）的模分复用通信是解决单模光纤带宽耗尽问题最具竞争力的方案。少模光纤中不同模式之间的差分模群延迟（DMGD）是表征少模光纤的一个重要方面，便捷、快速且准确地测量少模光纤不同模式下的DMGD是一项关键任务。本文提出了一种基于菲涅尔反射峰的少模光纤差分模群延迟单端测量方法。进行了实验测量以确定一根3.689千米的六模光纤和一根9.7千米的三模光纤的差分模群延迟，并将结果与传统飞行时间方法进行了比较。研究结果表明，我们提出的基于菲涅尔反射峰的方法在测量少模光纤的差分模群延迟方面具有良好的准确性。此外，该方法能够实现单端测量，具有简单性和实用性。
