【作者】 刘俭辉；

【导师】 李世忱；

【作者基本信息】 天津大学 ， 物理电子学， 2004， 博士

【摘要】 本研究来源于2003年天津市科技发展计划重点基金项目：通信用宽带可调谐光纤激光器的研制。围绕项目内容所进行的应用基础性研究工作具体如下：1. L-band EDFA的理论分析与实验研究分析了L-band EDFA的增益特性；使用数值计算方法做了小信号增益特性模拟，从而理论上证明了L-band EDFA增益的本征平坦特性；进行了L-band EDFA的实验研究，获得了提高泵浦转换效率的预期结果。2. 增益平坦EDFA的实验研究利用光纤环形镜（FLM）和长周期光纤光栅（LPFG）做增益平坦滤波器进行了C-band EDFA增益平坦实验，在30nm波长范围内分别获得约20dB的增益，增益变化小于±0.9dB；对不同EDF长度的L-band EDFA增益特性进行了数值模拟和实验研究；用F-P滤波器对L-band EDFA的平坦ASE谱进行梳状滤波，在L-band 30nm带宽内获得多波长ASE光谱；采用串联结构进行C+L宽带EDFA实验，平坦增益带宽达70nm。3. 可调谐光纤激光器的实验研究分别使用光纤环形镜滤波器、楔型F-P薄膜滤波器和角调谐F-P薄膜滤波器进行了C-band可调谐掺铒光纤激光器（EDFL）实验，可调谐范围分别为30nm、35nm和25nm，线宽分别为0.8nm、0.1nm和0.1nm。利用普通的光纤环型镜进行了L-band可调谐EDFL实验，可调谐范围约40nm，线宽为0.8nm；为压缩线宽，应用基于利奥(Lyot)型和索尔克(Solc)型光纤环型镜构成的组合滤波器进行改进性实验，在40nm范围内获得小于0.1nm的可调谐激光输出。应用普通的光纤环形镜进行了C+L带可调谐EDFL实验，可调谐范围为60nm，输出线宽0.8nm。4. 光纤喇曼放大器（FRA）的设计研究对FRA的放大特性进行了研究和探讨，理论分析了分布FRA对光传输系统性能的改善作用；对多波长泵浦FRA的增益平坦问题进行了分析，对FRA+EDFA宽带放大器进行了优化设计。更多还原

【Abstract】 This work comes from the Key Program of Tianjin Science and Technology Development Plan (2003), i.e. ‘Development of wideband tunable fiber lasers for communication application’. The contents of the fundamental work related to this program are as follows:1. Theoretic analysis and experimental research of L-band erbium-doped fiber amplifier (EDFA)Analysis of gain characteristic of L-band EDFA; Simulation of gain characteristic in small signal condition using numerical computation, which theoretically verified the intrinsic flat gain characteristic of L-band EDFA; Experimental research of L-band EDFA, achieving expected results of improved pump efficiency2. Experimental research of EDFA gain flatnessExperimenting on gain flatness issue of C-band EDFA employing a fiber loop mirror (FLM) and a long period fiber grating (LPFG) respectively and both achieving average gain about 20dB and variation less than ±0.9dB in a range of 30nm; numerical and experimental research of L-band EDFA gain characteristic with different EDF lengths; comb-like filtering of L-band flattened ASE spectrum using a F-P filter and acquiring a multi-wavelength ASE source of 30nm wide; Experimenting with series structure C+L band EDFA and achieving a flattened gain as wide as 70nm.3. Experimental research of tunable fiber laserExperimenting with C-band tunable erbium-doped fibers (EDFLs) using filters based on fiber loop mirror (FLM), wedge thin-film F-P and angle tuning thin-film F-P, achieving line-width of 0.8nm, 0.1nm and 0.1nm respectively. Experimenting with L-band tunable EDFL using a conventional FLM, achieving tunable range about 40nm and line-width of 0.8nm; compressing line-width using compound filters based on Lyot and Solc type FLMs, achieving tunable laser output with line-width<0.1nm in a range of 40nm. Experimenting with C+L band EDFL <WP=4>applying conventional FLMs, achieving tunable range of 60nm and line-width of 0.8nm.4. Research of fiber Raman amplifier (FRA) designStudy and discussion of FRA’s amplification characteristics; theoretically analysis of effects of employing distributed FRAs on improving system performance; Analysis of gain flatness of multi-wavelength pumped FRA and optimization of FRA+EDFA wide band amplifier design.更多还原