一种穿越EDFA的长途多跨段光纤监测技术

Long-Distance Multi-Span Fiber Optic Monitoring Technology without Filling Light and Crossing EDFA

针对现有的光时域反射仪(OTDR)在监测带有掺铒光纤放大器(EDFA)的长途多跨段光纤链路时,为克服EDFA增益的波动需增加一个额外的补光来保持功率稳定的问题,文章基于线性调频OTDR提出了一种无需补光穿越EDFA的长途多跨段光纤监测技术。该技术利用线性调频准连续光作为探测光,可以避免EDFA增益的波动。同时通过分数域傅里叶滤波来去除级联EDFA累积的自发辐射白噪声,从而提高接收信号的信噪比。实验结果表明,该技术能够准确地测出中长途多跨段光纤链路中EDFA和连接点处的反射事件。

In order to overcome the Erbium Doped Fiber Amplifier (EDFA) gain fluctuations when monitoring long-distance multi-span fiber links with EDFA for existing Optical Time Domain Reflectometry (OTDR),an additional fill light is needed to maintain power stability.In this paper,based on linear frequency modulated optical time domain reflectometry,a long-distance multi-span fiber monitoring technology that does not require supplemental light to pass through EDFA is proposed.This technique utilizes chirped quasi-continuous light as the probe light to avoid fluctuations in the EDFA gain.At the same time,the fractional-domain Fourier filtering is used to remove the spontaneous emission white noise accumulated in the cascaded EDFA,thereby improving the signal-to-noise ratio of the received signal.The experimental results show that the technology can accurately detect the reflection events at the EDFA and the connection points in the long-distance multi-span fiber link.