光纤端面反射对高功率光纤放大器特性的影响
Effects of reflection of fiber end on characteristics of high power fiber amplifier
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摘要: 从光纤端面研抛工艺的技术特点出发，计算了端面倾角和反射率的关系，估算了斜面研抛后端面反射率的大小。在掺Yb3+双包层光纤放大器理论模型的基础上，数值模拟了常规研抛角度误差造成的端面反射率对放大器输出特性的影响。计算结果表明：端面反射导致系统内出现严重放大的自发辐射和自激现象，减小光纤两个端面的反射率是最有效的抑制方法，同时，增大入射信号激光功率也可以抑制自激，提高输出信号光功率和信噪比。Abstract: The reflectivity of the fiber ends was estimated by studying the technology of fiber end polishing and lapping. Based on rate and propagation equations of the Ybdoped fiber amplifier, the effect of the fiberend reflectivity on the output characteristics induced by the error of the polishing angle was simulated numerically. The results show that both reducing the reflectivity of the fiber end and increasing the power of the input signal can reduce the amplified spontaneous emission and restrain the selfoscillations. The performance of the high power fiber amplifier can be improved by choosing the angle of the fiber end inclined-surface polished and the power of the input signal properly．
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Key words:
- laser techniques /
- fiber end /
- numerical simulation /
- high power fiber amplifier /
- reflectivity /
- signal light
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