基于OFDR技术的光回损定位系统的研究与设计

Optical time domain reflectometer (OTDR) measurement method can not solve the contradiction between the transmission distance and spatial resolution effectively. Optical frequency domain reflectometry (OFDR) is an advanced measurement technology developed by the principle of back scattering theory with higher spatial resolution when compared with the optical time domain reflectometer (OTDR). OFDR has wide application prospects in the tomographic technique, optical waveguide measurement, optical fiber measurement and optical fiber sensor field. This paper analyzes the theory of OFDR, and analyzes the relationship between the light scanning repetition frequency, the light source variation range, the bandwidth of the receiver and the spatial resolution. This paper designed a light return loss measurement system based on OFDR technology. The system has certain practical value as it running stably, meanwhile can overcoming the shortcoming of OTDR.