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抽运光源是光纤拉曼放大器应用于密集波分复用系统的关键技术,设计了一种紧凑型的808 nm激光二极管抽运的基于钒酸钇(Nd3+∶YVO4)晶体1342 nm固体激光器模块,提出利用上述1342 nm固体激光器抽运基于光纤光栅的单级全光纤型拉曼谐振器获得1.4μm激光输出的光纤拉曼激光器,分析了固体激光器的阈值特性、性能优化方法和单级光纤拉曼谐振器的设计方法。上述1342 nm固体激光器模块在抽运功率2 W时获得了最大655 mW的激光输出功率和42.6%的斜率效率,单级拉曼谐振器的1342 nm到1.4μm光功率转换斜率效率达75%,在1425 nm1、438 nm1、455 nm和1490 nm处的输出功率达到300 mW以上。最后给出基于1.4μm光纤拉曼激光器抽运的宽带平坦放大的光纤拉曼放大器的结构参量和性能测试结果。
The pumping light source is the key technology of fiber Raman amplifier used in dense wavelength division multiplexing system. A compact 1342 nm solid-state laser module based on yttrium vanadate (Nd3 +: YVO4) is designed with a compact 808 nm laser diode pump. A fiber Raman laser with 1.4μm laser output was obtained by pumping a single-stage all-fiber Raman resonator based on fiber grating with the above 1342 nm solid state laser. The threshold characteristics, performance optimization and single-stage fiber Raman Resonator design method. The 1342 nm solid-state laser module achieves a maximum output power of 655 mW and a slope efficiency of 42.6% at a pumping power of 2 W. The single-stage Raman resonator achieves an optical power conversion slope efficiency of 1342 nm to 1.4 μm with a gain of 75% The output power at 1425 nm1,438 nm at 1, 455 nm and 1490 nm reaches over 300 mW. Finally, the experimental results of the structure parameters and performance of a wideband flattened fiber Raman amplifier based on a 1.4μm fiber Raman laser are presented.