Brillouin OTDR (BOTDR) distributed fiber sensing system is featured by excellent real-time performance, high spatial resolution and measurement accuracy, as well as simple structure.
Design considerations of laser sources for coherent BOTDR system
1550nm wavelength is adopted due to its lower loss in the fiber;
The higher the optical power, the larger the Brillouin scattering signal intensity (no SBS);
The narrower the linewidth of laser source, the better the measurement accuracy of system;
The narrower the spectral linewidth of laser source, the better the working distance of BOTDR;
