首页|Mode-dependent dynamic gain of all-fiber FM-EDFA under various pump manipulation
Mode-dependent dynamic gain of all-fiber FM-EDFA under various pump manipulation
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The dynamic gain of a few-mode erbium-doped fiber amplifier[FM-EDFA]is vital for the long-haul mode division multiplexing[MDM]transmission.Here,we investigate the mode-dependent dynamic gain of an FM-EDFA under various manipulations of the pump mode.First,we numerically calculate the gain variation with respect to the input signal power,where a mode-dependent saturation input power occurs under different pump modes.Even under the fixed intensity profile of the pump laser,the saturation input power of each spatial mode is different.Moreover,high-order mode pumping leads to a com-pression of the linear amplification region,even though it is beneficial for the mitigation of the differential modal gain[DMG]arising in all guided modes.Then,we develop an all-fiber 3-mode EDFA,where the fundamental mode of the pump laser can be efficiently converted to the LP11 mode using the all-fiber mode-selective coupler[MSC].In comparison with the traditional LP01 pumping scheme,the DMG at 1550 nm can be mitigated from 1.61 dB to 0.97 dB under the LP11 mode pumping,while both an average gain of 19.93 dB and a DMG of less than 1 dB can be achieved from 1530 nm to 1560 nm.However,the corre-sponding signal input saturation powers are reduced by 0.3 dB for the LP01 mode and 1.6 dB for the LP11 mode,respectively.Both theoretical and experimental results indicate that a trade-off occurs between the DMG mitigation and the extension of the linear amplification range when the intensity profile of pump laser is manipulated.
few-mode erbium-doped fiber amplifierdifferential modal gainsaturation input power
方翼鸿、张心怡、黄锡恒、曾研、许鸥、李建平、付松年、秦玉文
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Institute of Advanced Photonics Technology,School of Information Engineering,Guangdong University of Technology,Guangzhou 510006,China
Guangdong Provincial Key Laboratory of Information Photonics Technology,Guangdong University of Technology,Guangzhou 510006,China
Key Laboratory of Photonic Technology for Integrated Sensing and Communication,Ministry of Education,Guangdong University of Technology,Guangzhou 510006,China
国家重点研发计划国家自然科学基金Guangdong Introducing Innovative and Entrepreneurial Teams of the Pearl River Talent Recruitment ProgramGuangdong Provincial Key Laboratory of Photonics Information Technology
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