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

Photonics Research 2024年第08期12卷 1768-1775页

作者： 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 State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University State Key Laboratory of Optical Fiber and Cable Manufacture Technology Yangtze Optical Fibre and Cable Joint Stock Limited Company School of Computer and Communication Engineering University of Science and Technology Beijing Department of Networks China Mobile Communications Group Co. Ltd. Department of Fundamental Network Technology China Mobile Research Institute Pengcheng Laboratory

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∕LP02transmission 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. ? 2024 Chinese Laser Press

关键词： Chemical vapor deposition Erbium fibers Few mode fibers High power fiber lasers Multimode fibers Signal processing

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