| Citation: | CHEN Tong, LIU Wei, YANG Yue, LI Yang, LONG Han, WU Jian-jun, XIANG Min, CHENG Ju-xin. The influence of second-order pump seed light on third-order Raman fiber amplifier[J]. Chinese Optics. doi: 10.37188/CO.2024-0170
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Third-order Raman fiber amplifier is used in long-haul unrepeatered optical transmission due to its higher gain and lower noise figure. Third-order Raman fiber amplifier is an advanced technology in Raman amplification, and currently there is very limited research on it in China. The relationship between the pump configuration and performance of the amplifier is not clear yet. Therefore, this paper analyzes the influence of second-order pump seed light on third-order Raman fiber amplifiers through experiments. Firstly, the feasibility of not using second-order pump seed light is qualitatively analyzed. Then it is experimentally verified that in the absence of second-order pump seed light, the third-order Raman fiber amplifier can still achieve signal light gain, but its efficiency will decrease. A 47-channel 200 km wavelength division multiplexing transmission system is constructed, the experimental results show that the third-order Raman fiber amplifier can amplify the signal light without second-order pump seed light, but the introduce of the second-order pump seed light can significantly improve its performance. A second-order pump seed light with only 25 mW can achieve a minimum signal power gain of 3.7 dB, an average gain of 6 dB, and an average signal-to-noise ratio gain of 1.6 dB. Eliminating second-order pump seed light can reduce costs, but introducing a second-order pump seed light brings significant performance improvements to third-order Raman amplifiers.
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