单频EYDFA中种子光功率和增益光纤温度对输出线宽的影响

Influence of seed power and gain fiber temperature on output linewidth in single-frequency EYDFA

针对单频激光在放大过程中线宽展宽的问题,对1 550 nm单频铒镱共掺光纤放大器(EYDFA)中种子光功率和温度对输出线宽的影响进行了实验研究。实验对比了不同种子光功率、增益光纤温度下,放大后线宽的变化情况。实验结果表明,获得相同输出功率时,提高的种子光功率会增加输出信噪比(SNR),并降低放大后线宽展宽的程度。当种子光功率确定时,增益光纤温度也会影响输出线宽。在相同泵浦功率下,增益光纤温度上升会提高放大器的效率和增加受激自发辐射(ASE)强度,但会使输出线宽的展宽增加。同时,分析了种子光功率和温度影响EYDFA输出线宽的原因,认为ASE是影响线宽展宽特性的原因之一。

Based on the 1 550 nm single-frequency Erbium-Ytterbium co-doped fiber amplifier(EYDFA),the linewidth broadening with different seed powers and gain fiber temperatures was experimentally investigated.The results demonstrate that,to obtain the same output power,the increase of the seed power was beneficial to improve the output signal to noise ratio(SNR),and to reduce the linewidth broadening.The increase of gain fiber temperature can improve slope efficiency and enhance the amplified spontaneous emission(ASE)intensity but broaden linewidth.Meanwhile,the reason of linewidth broadening was discussed and the ASE was considered as one of the reason of linewidth variation.