Low-modal-crosstalk doped-fiber amplifiers in few-mode-fiber-based systems

IF 6.6 1区物理与天体物理 Q1 OPTICS

Photonics Research Pub Date : 2024-05-29 DOI:10.1364/prj.521376

Shuailuo Huang, Lei Shen, Gang Qiao, Yuanpeng Ding, Yuyang Gao, Jian Cui, Baolong Zhu, Siyuan Liu, Mingqing Zuo, Jinglong Zhu, Lei Zhang, Jie Luo, Yongqi He, Zhangyuan Chen, Juhao Li

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引用次数: 0

Abstract

Independent light propagation through one or multiple modes is commonly considered as a basic demand for mode manipulation in few-mode fiber (FMF)- or multimode fiber (MMF)-based optical systems such as transmission links, optical fiber lasers, or distributed optical fiber sensors. However, the insertion of doped-fiber amplifiers always kills the entire effort by inducing significant modal crosstalk. In this paper, we propose the design of doped-fiber amplifiers in FMF-based systems adopting identical multiple-ring-core (MRC) index profiles for both passive and doped fibers to achieve low modal crosstalk. We develop the direct-glass-transition (DGT) modified chemical vapor deposition (MCVD) processing for precise fabrication of few-mode erbium-doped fibers (FM-EDFs) with MRC profiles of both refractive index and erbium-ion doping distribution. Then, a few-mode erbium-doped-fiber amplifier (FM-EDFA) with a maximum gain of 26.08 dB and differential modal gain (DMG) of 2.3 dB is realized based on fabricated FM-EDF matched with a transmission FMF supporting four linearly polarized (LP) modes. With the insertion of the FM-EDFA, 60 + 60 km simultaneous LP01/LP11/LP21/LP02 transmission without inter-modal multiple-input multiple-output digital signal processing (MIMO-DSP) is successfully demonstrated. The proposed design of low-modal-crosstalk doped-fiber amplifiers provides, to our knowledge, new insights into mode manipulation methods in various applications.

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基于少模光纤系统的低模态串扰掺杂光纤放大器

在基于少模光纤（FMF）或多模光纤（MMF）的光学系统（如传输链路、光纤激光器或分布式光纤传感器）中，通过一种或多种模式进行独立光传播通常被视为模式操控的基本要求。然而，掺杂光纤放大器的插入总是会引起严重的模态串扰，从而使整个工作功亏一篑。在本文中，我们提出在基于 FMF 的系统中设计掺杂光纤放大器，对无源光纤和掺杂光纤采用相同的多环芯（MRC）索引剖面，以实现低模态串扰。我们开发了直接玻璃转换（DGT）改性化学气相沉积（MCVD）工艺，用于精确制造具有折射率和掺铒离子分布 MRC 曲线的少模掺铒光纤（FM-EDF）。然后，基于与支持四个线性偏振（LP）模式的传输 FMF 相匹配的 FM-EDF，实现了最大增益为 26.08 dB、差分模态增益（DMG）为 2.3 dB 的少模掺铒光纤放大器（FM-EDFA）。通过插入 FM-EDFA，成功演示了 60 + 60 千米的 LP01/LP11/LP21/LP02 同步传输，无需模式间多输入多输出数字信号处理（MIMO-DSP）。据我们所知，所提出的低模态串扰掺杂光纤放大器设计为各种应用中的模态操纵方法提供了新的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Photonics Research OPTICS-

CiteScore

13.60

自引率

5.30%

发文量

1325

期刊介绍： Photonics Research is a joint publishing effort of the OSA and Chinese Laser Press.It publishes fundamental and applied research progress in optics and photonics. Topics include, but are not limited to, lasers, LEDs and other light sources; fiber optics and optical communications; imaging, detectors and sensors; novel materials and engineered structures; optical data storage and displays; plasmonics; quantum optics; diffractive optics and guided optics; medical optics and biophotonics; ultraviolet and x-rays; terahertz technology.