Development of laser light source with high stability for Brillouin optical fiber sensor

Temperature and strain measurement accuracy of Brillouin distributed optical fiber sensor are easily influenced by the performance of laser light source. A wavelength/power DFB semiconductor laser light source with high-stability used for Brillouin Fiber Sensing is designed. The laser light source works with constant-current drive circuit and temperature control circuit, which precisely controls drive current and operating temperature of the DFB semiconductor laser and makes the wavelength and optical power under control. The results show that: (1) the optical wavelength increases about 0.1nm and the power reduces about 0.05dBm when the temperature increased by 1 degrees C. (2) The maximum drift of wavelength is 0.012nm and the maximum drift of optical power is 0.05dBm(0.0014mW) at 25 degrees C within one hour. The laser light source can completely meet the demand for Brillouin distributed optical fiber sensing.