C+L波段全覆盖高增益掺铒光纤放大器  

C+L-Band Full-Coverage High-Gain Erbium-Doped Fiber Amplifiers

作　　者：邹泳芳 董新永 巫智凯 文建湘[4] 王廷云[4] 汪松 王云才 秦玉文 Zou Yongfang;Dong Xinyong;Wu Zhikai;Wen Jianxiang;Wang Tingyun;Wang Song;Wang Yuncai;Qin Yuwen(Institute of Advanced Photonics Technology,School of Information Engineering,Guangdong University of Technology,Guangzhou 510006,Guangdong,China;Key Laboratory of Photonic Technology for Integrated Sensing and Communication,Ministry of Education,Guangdong University of Technology,Guangzhou 510006,Guangdong,China;Guangdong Provincial Key Laboratory of Information Photonics Technology,Guangdong University of Technology,Guangzhou 510006,Guangdong,China;Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Shanghai University,Shanghai 200444,China;State Key Laboratory of Optical Fiber and Cable Manufacture Technology,Yangtze Optical Fiber and Cable Joint Stock Limited Company(YOFC),Wuhan 430073,Hubei,China)

机构地区：[1]广东工业大学信息工程学院先进光子技术研究院,广东广州510006 [2]广东工业大学通感融合光子技术教育部重点实验室,广东广州510006 [3]广东工业大学广东省信息光子技术重点实验室,广东广州510006 [4]上海大学特种光纤与光接入网重点实验室,上海200444 [5]长飞光纤光缆股份有限公司光纤光缆先进制造与应用技术全国重点实验室,湖北武汉430073

出　　处：《中国激光》2024年第18期201-206,共6页Chinese Journal of Lasers

基　　金：国家重点研发计划(2020YFB1805804);国家自然科学基金国际(地区)合作与交流项目(62361136584);广东省“珠江人才计划”引进创新创业团队项目(2019ZT08X340)。

摘　　要：通过增加光纤放大器的增益带宽,可以有效提升光纤通信系统的传输容量。目前,C+L波段掺铒光纤放大器(EDFA)通常采用C波段和L波段EDFA并联的方式,但这种方法会在两个增益波段之间产生带宽“死区”。为了解决这一问题,以Bi/Er共掺石英光纤作为主要增益介质,在二级双程放大结构的基础上,通过插入波长匹配的长周期光纤光栅进行“削峰补谷”操作,成功拓展了增益带宽。这种新型的C+L波段全覆盖高增益掺铒光纤放大器,其25 dB增益带宽和20 dB增益带宽分别达到了78 nm(1529~1607 nm)和85 nm(1527~1612 nm),最高增益可达51.2 dB,同时噪声系数降至3.9 dB。该研究不仅消除了C+L波段EDFA的带宽“死区”问题,而且通过结合长周期光纤光栅,实现了单个EDFA对C+L波段的高增益全覆盖。该EDFA有望在未来高容量长距离光纤传输系统中获得重要应用。Objective Increasing the gain bandwidth of optical fiber amplifiers is the simplest and most effective method for improving the transmission capacity of optical fiber communication systems.Currently,C+L-band erbium-doped fiber amplifiers(EDFAs)are typically formed by parallel C-and L-band EDFAs,without any gaps between the two bands.Therefore,the research and development for an EDFA with a high gain bandwidth that fully covers the C+L band,have always garnered attention.However,the initially designed C+L band EDFA either fails to cover the gain bandwidth within entire C+L band or suffers from low gain levels and high noise,unable to fully meet the requirements of long-distance transmission systems.In this study,a C+L-band full-coverage high-gain EDFA is realized using a Bi/Er co-doped fiber as the main gain medium in a two-stage double-pass amplification structure with a long-period fiber grating inserted to shave the gain peak and fill the valley with 25 dB and 20 dB gain bandwidths corresponding to 78 nm(1529‒1607 nm)and 85 nm(1527‒1612 nm),respectively.The maximum gain reaches 51.2 dB,and the minimum noise is 3.9 dB,achieving a sufficiently high gain in a broad gain bandwidth covering the entire C+L-band,indicating a high potential for widespread use in future high-capacity long-haul optical fiber transmission systems.Methods To increase the gain level and control noise,the amplifier uses a two-stage double-pass amplification structure.The main amplifier has an 8 m long bismuth/erbium co-doped silica fiber(BEDF)as the gain medium,which is bidirectionally pumped by a pair of 1480 nm laser diodes.The BEDF is fabricated using the atomic layer deposition(ALD)method in conjunction with modified chemical vapor deposition(MCVD).In addition to the co-doped elements of Bi(mole fraction of 0.004%)and Er(mole fraction of 0.109%),Al,P,and Ge are also included.This fiber exhibits a background loss of 0.02 dB/m at 1200 nm and an absorption coefficient of 22 dB/m at 1531 nm.For the pre-amplifier,a 2 m high-concentration

关 键 词：掺铒光纤放大器 C+L波段 增益带宽 长周期光纤光栅 

分 类 号：O436[机械工程—光学工程]