【作者】 白冰；

【导师】 郭玉彬；

【作者基本信息】 吉林大学 ， 测试计量技术及仪器， 2005， 硕士

【摘要】 在光纤通信技术中,研究波长精确、性能优良的激光源是人们关切的课题。目前光纤通信系统中主要采用半导体激光器作为发射源,其发射过程伴随着有源区内自由载流子的浓度变化导致啁啾效应,不能满足高速率密集波分复用系统的发展要求。近年来,掺铒光纤激光器以其优良的性能成为高速光通信和光缆电视光传输系统理想光源的候选者之一。随着全光通信器件小型化、集成化发展,掺铒光纤光栅激光器的研究逐渐成为全光通信光源领域的一个热点。采用高掺杂的掺铒光纤作为增益介质可以有效地缩短增益介质的长度,不仅大大缩小了结构尺寸、简化了光纤激光器的结构,而且提高了光源的稳定性和实用性。该类激光器设计小巧灵活,易与光纤系统兼容,并有良好的输出稳定性和单色性,温度及波长选择性更佳,便于调谐、封装、温控,使用方便,易于集成,顺应小型化、集成化全光通信的国际化趋势。其性能价格比将优于现有的掺铒光纤激光器和传统的半导体激光器,将会在对波长选择要求严格、波长稳定性要求高的应用中成为半导体分布反馈激光器强有力的竞争对手。此项研究工作有利于实现全光纤通信系统,也能为一维光子集成激光器的研制奠定基础,被认为是未来长距离大容量的超高速光纤通信系统的理想光源。更多还原

【Abstract】 This paper worked on two types of high-stability and high-performance Er³⁺-doped fiber laser. One DBR Er³⁺-doped fiber laser of high output power and high wavelength stability was developed. Its gain medium was 2.57m long Er³⁺-doped fiber of high erbium concentration. When it was pumped by 980nm laser-diode, the output spectral bandwidth was measured as 0.2nm by 3dB and 0.4nm by 25dB at 1550nm.The max output power was measured as 20mW. Its power stability was ±0. 01dB, side mode suppression ratio was 60dB, and the stability of output wavelength was 0.01dB （Confined by the precision of OPM）. The laser had a threshold of 8.6mW and a slope efficiency of 17.1 %. Anther is a new-style high-performance ring wavelength-tunable fiber bragg grating laser. The laser used 980nm LD as pump source and 10.8m new-style gain flatting erbium-doped fiber as gain medium. Precisely locked to the ITU-T wavelength grid with the stability of 0.01nm using tunable fiber Bragg grating is demonstrated。The tuning range of 41nm（1528nm～1569nm） , linewidth in 3dB<0.08nm and in 25dB<0.2nm, edge-mode suppression ratio>60dB have been achieved. The maximum output power was 46.94 mW and the stability of power is better than ±0.02dB,The threshold and slope efficiency of laser were 7.3 mW and 39.75% .The output power of fiber ring laser influenced by difference split ratio of output couplers or different length of Er-doped fiber is discussed.更多还原