Abstract

An optical gain clamping system for forward remote optically pumped amplifier (F-ROPA) was experimentally studied. To implement gain clamping, spectrally selective optical feedback within one channel is created. When the unsaturated gain exceeds the losses in the feedback circuit, oscillation occurs with gain clamped at a level exactly compensating for the losses in the feedback circuit. It is established that the ROPA gain in the optical clamping mode changes by no more than 0.17 dB when the pump laser power varies in the range from 21.5 to 29 dBm, 0.43 dB when the input signal power modulates from 2 to 10 dBm, 0.24 dB when the ambient temperature changes in the range from –40 to +50°C. It is shown that optical gain clamping does not lead to distortion of the gain spectrum, and the gain can be controlled with high accuracy by changing losses in the feedback cavity. The results obtained indicate the prospects of using optical gain clamped F-ROPAs in optical communication lines with long spans.

中文翻译：

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具有远程光泵浦的光纤放大器的全光增益钳位

摘要

对前向远程光泵放大器（F-ROPA）的光增益钳位系统进行了实验研究。为了实现增益钳位，在一个通道内创建光谱选择性光反馈。当不饱和增益超过反馈电路中的损耗时，会发生振荡，增益被钳位在精确补偿反馈电路中的损耗的水平。结果表明，当泵浦激光功率在21.5至29 dBm范围内变化时，光学钳位模式下的ROPA增益变化不超过0.17 dB，当输入信号功率从2至10 dBm调制时，0.43 dB，0.24 dB当环境温度在 –40 至 +50°C 范围内变化时。结果表明，光增益钳位不会导致增益谱失真，并且可以通过改变反馈腔中的损耗来高精度地控制增益。所得结果表明了在大跨度光通信线路中使用光增益钳位F-ROPA 的前景。