在一定分辨率和响应时间要求下,应用波分复用技术来串联布里渊散射分布式光纤传感器,解决了同时进行传感和通信存在的信号干扰.具体是采用波分复用来隔离传感光信号与通信光信号,同时应用光相干外差接收来分离传感与通信之间的电信号频谱.实现了两台布里渊散射分布式光纤传感器之间的串联,单台传感器的传感距离为25 km,串联后达到50 km.

For a given resolution, single Brillouin scattering distributed optical-fiber sensor can only reach a definite sensing length, and in some applications, sensing and communication should be run in a single fiber. Wavelength division multiplexing and optical heterodyne detecting were used to series connect Brillouin scattering distributed optical-fiber sensors. Wavelength division multiplexing was adopted to isolate the sensing light and the communication light. The optical heterodyne detecting was used to vary the spectrum of sensing signal from the communication signal. The series connecting between two Brillouin scattering distributed optical-fiber sensors was achieved, the sensing length of single sensor was 25 km, and the sensing length of two series connecting sensors was 50 km. The experimental results show that the configuration is feasible.