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本实验在1.15μm波长波段运用APD及Ge-PIN前置调谐式前级放大器实现了光相干式时域反射计(Coherent OTDR)。观察到了长1500m的单模光纤的二次菲涅尔反射及一次瑞利散射。
In this experiment, Coherent OTDR was realized by APD and Ge-PIN preamplifier preamplifier in 1.15μm wavelength band. A second-order Fresnel reflection and a Rayleigh scattering of a single-mode fiber with a length of 1500 m were observed.