刘杨, 尚盈, 王晨, 黄胜, 曹冰, 赵文安, 李常, 祁海峰, 倪家升. 放大器自发辐射噪声对分布式声波监测系统的影响[J]. 红外与激光工程, 2018, 47(S1): 82-85. DOI: 10.3788/IRLA201746.S122005
引用本文: 刘杨, 尚盈, 王晨, 黄胜, 曹冰, 赵文安, 李常, 祁海峰, 倪家升. 放大器自发辐射噪声对分布式声波监测系统的影响[J]. 红外与激光工程, 2018, 47(S1): 82-85. DOI: 10.3788/IRLA201746.S122005
shu
Liu Yang, Shang Ying, Wang Chen, Huang Sheng, Cao Bing, Zhao Wenan, Li Chang, Qi Haifeng, Ni Jiasheng. Influence of amplifier spontaneous emission noise on distributed acoustic monitoring systems[J]. Infrared and Laser Engineering, 2018, 47(S1): 82-85. DOI: 10.3788/IRLA201746.S122005
Citation: Liu Yang, Shang Ying, Wang Chen, Huang Sheng, Cao Bing, Zhao Wenan, Li Chang, Qi Haifeng, Ni Jiasheng. Influence of amplifier spontaneous emission noise on distributed acoustic monitoring systems[J]. Infrared and Laser Engineering, 2018, 47(S1): 82-85. DOI: 10.3788/IRLA201746.S122005
shu

放大器自发辐射噪声对分布式声波监测系统的影响

Influence of amplifier spontaneous emission noise on distributed acoustic monitoring systems

    摘要
  • 摘要: 掺铒光纤放大器（Erbium Doped Fiber Amplifier，EDFA）是分布式声波监测系统的重要组成部分，对于提高信号光的传输距离和系统解调信号的信噪比至关重要。但EDFA的引入也不可避免地带来了放大器自发辐射（Amplifier Spontaneous Emission，ASE）噪声。利用一个分布式声波监测系统，分别研究了不同位置的EDFA产生的ASE噪声对系统解调信号的影响。结果表明，功率EDFA产生的ASE噪声对于系统解调信号的信噪比基本没有影响。而前置EDFA产生的ASE噪声会对系统解调信号的信噪比产生很大的影响，在系统中加入一个中心波长为1 550.12 nm，带宽为0.2 nm的滤波器后，系统解调信号的信噪比从大约20 dB增加到60 dB。

     

    Abstract: Erbium Doped Fiber Amplifier (EDFA) is an indispensable part of the distributed acoustic monitoring system. It plays an important role in improving the transmission distance and the signal-to-noise ratio of the demodulation signal. However, the presence of the EDFAs will bring Amplifier Spontaneous Emission (ASE) noise generated by different EDFAs on the whole system. Using a filter with a bandwidth of 0.2 nm, the influence of ASE noise on the demodulation signal was observed. The ASE noise generated by the power-EDFA has no effect on the SNR of the demodulation signal. However, the ASE noise generated by the pre-EDFA will greatly affect the SNR of the demodulation signal. After adding a filter after the pre-EDFA with center wavelength of 1 550.12 nm and bandwidth of 0.2 nm, the signal-to-noise ratio of the demodulation signal was increased from about 20 dB to 60 dB.

     

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