Provided are a device for detecting optical time-domain detection signals (OTDR) and a method for detecting related coherent optical time-domain detection signals. The method includes: dividing the successive coherent optical signals emitted by a coherent light source into two bundles, with a first bundle being used as detection light and a second bundle as local oscillator light; modulating the detection light according to a related code pattern sequence to generate a pulse sequence optical signal, and inputting the same into an optical fibre to be tested; receiving back-scattering light from the optical fibre to be tested, performing coherence processing on the back-scattering light and the local oscillator light, and converting the optical signal obtained by coherence processing to a digital signal; and performing data related processing on the digital signal and the related code pattern sequence to obtain and output an optical time-domain detection signal. The solution in the present invention combines the advantages of related and coherent OTDRs, making good the inadequacies thereof, and realizing high-resolution OTDR detection with high dynamic range.
METHOD AND DEVICE FOR DETECTING OPTICAL TIME-DOMAIN DETECTION SIGNALS