铋铒共掺光纤实现C+L+U波段超宽带放大  

Bismuth Erbium Co⁃Doped Fiber for C+L+U⁃Band Ultra⁃Wideband Amplification

作　　者：刘少坤 褚应波 戴能利 李进延 Liu Shaokun;Chu Yingbo;Dai Nengli;Li Jinyan(Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China)

机构地区：[1]华中科技大学武汉光电国家研究中心,湖北武汉430074

出　　处：《中国激光》2024年第14期210-216,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(11875139)。

摘　　要：传统掺铒(Er)光纤放大器的增益带宽已无法满足日益增长的通信带宽需求。为了对现有通信系统进行升级扩容,迫切需要开发出可实现多波段同时放大的光纤放大器。然而,国内尚未成功研制出能够实现多波段同时放大的增益光纤。基于改进的化学气相沉积技术,成功制备了可实现C+L+U波段同时放大的铋(Bi)铒共掺光纤,通过比较不同Bi、Er掺杂浓度对增益谱的影响,分析了其影响机制。讨论了不同泵浦方式(前向泵浦、后向泵浦和双向泵浦)和不同泵浦波长(1460 nm和1480 nm)对增益谱的影响。结果显示,基于双向泵浦结构,当输入信号功率为-25 dBm时,采用自制铋铒共掺光纤搭建的放大器在1530~1670 nm范围内实现了11.8 dB以上的增益,噪声指数为6.3 dB~9.3 dB。Objective Existing communication systems continue to use traditional erbium (Er)-doped fiber amplifiers,which can amplify only the C or L band,severely limiting further expansion of communication transmission bandwidth.To expand the transmission bandwidth,a common method is to connect fiber amplifiers in different bands in parallel and then couple the amplified signals in different bands into a single fiber for transmission.However,this method also faces problems such as severe gain imbalance,the existence of gain“dead zones,”and complex structures with high equipment costs.Therefore,achieving simultaneous amplification of multiple bands in a single fiber is considered a major solution for expanding gain bandwidth and improving transmission capacities.Due to their ultra-wideband emission characteristics,bismuth (Bi) Er co-doped fibers (BEDFs) are considered the most feasible solution for achieving simultaneous multiband amplification and have attracted widespread attention from academia and industry.With reliance placed on the joint action of Er and germanium-related bismuth active centers (BACs-Ge),ultra-wideband flat amplification can be achieved in the C+L+U band.In 2017,the Fiber Optic Research Center of Russia (FORC) successfully prepared for the first time a BEDF with a gain of over 15 dB at 1515?1775 nm.However,to date,no studies have been reported in China on BEDFs that can simultaneously achieve a positive gain in the C+L+U band.Methods Preforms with different concentrations of Bi and Er are prepared using a modified chemical vapor deposition (MCVD)method.The GeO_(2) content in the BEDF core is measured using an electron probe micro analyzer (EPMA),and the Er and Bi contents in the BEDF core are measured using inductively coupled plasma mass spectrometry (ICP-MS).The absorption spectrum of the BEDF is measured using a fiber analyzer based on the truncation method.The amplification testing system is built based on a selfmade BEDF using three different pumping schemes,namely,forward,backward,and bidire

关 键 词：铋铒共掺光纤 改进的化学气相沉积 C+L+U波段 放大器 

分 类 号：O436[机械工程—光学工程]