摘要
在通信领域,特别是波分复用方面,为了同时调整多通道增益和实现多波长光纤激光器大范围稳定的光波输出,本文提出了一种未泵浦掺铒光纤Sagnac环透射端掺铒光纤放大器增益平坦特性研究方案,其由Sagnac环自身谐振模式、未泵浦掺铒光纤的吸收特性和由环中双折射拍长引起的谐振模式3者共同作用。通过调节Sagnac环中的偏振控制器,使得掺铒光纤放大器(EDFA)增益光谱在非泵浦掺铒光纤Sagnac环透射端可以被部分或者全部平坦化。实验结果表明:在透射端14 nm的波长范围内,部分增益光谱的平坦度为±0.145 dB;整个C波段光谱36.5 nm的波长范围内,增益光谱的完全平坦度为±1.225 dB。该增益谱平坦方案结构简单,输出光谱平坦度好,有望用于波分复用系统和多波长激光器中。
In order to achieve the simultaneous adjustment of multi-channel gain in the communications,especially in WDM,and to develop a wide range of stable light outputs in multi-wavelength fiber lasers,a research scheme of the erbium-doped fiber amplifier gain flattening characteristic at the transmission-port of a Sagnac loop with an unpumped erbium-doped fiber is proposed.The scheme is a combination of the self-resonance mode of the Sagnac loop,the absorption characteristics of unpumped erbium-doped fiber and the resonance mode caused by birefringence beat length in the loop.By adjusting the polarization controllers properly in the loop,the gain spectrum can be partially or completely flattened at the transmission port of the Sagnac loop.The results show that,on one hand,the part of the spectrum is flatted within±0.145 dB in the wavelength range of 14 nm at the transmission port,but on the other hand,the total spectrum is flatted within±1.225 dB over a bandwidth of 36.5 nm in the whole C-band at the transmission port.The gain spectrum flattening scheme has a simple structure and good flatness of the output spectrum.It is expected that this technology will be used in WDM systems and multi-wavelength lasers.
作者
刘毅
郭荣荣
易小刚
郑永秋
陈鹏飞
LIU Yi;GUO Rong-rong;YI Xiao-gang;ZHENG Yong-qiu;CHEN Peng-fei(Key Laboratory of Advanced Transducers and Intelligent Control System,Ministry of Education and Shanxi Province,College of Physics and Optoelectronics,Taiyuan University of Technology,Taiyuan 030000,China;Strong Digital Technology Co.,Ltd.(Thinvent),Nanchang 410000,China;Key Laboratory of Instrumentation Science and Dynamic Measurement Ministry of Education,North University of China,Taiyuan 030051,China)
出处
《中国光学》
EI
CAS
CSCD
北大核心
2020年第5期988-994,共7页
Chinese Optics
基金
国家自然科学基金青年项目(No.61705157,No.61404140403,No.61805167)
国家自然科学基金面上项目(No.61975142,No.61475112)
山西省回国留学人员科研资助项目(No.2017-key-2)
山西省重点研发计划项目(No.201903D121124)。
