[14p-K304-1~16] 3.7 Optical measurement, instrumentation, and sensor

4:30 PM - 4:45 PM JST(7:30 AM - 7:45 AM UTC)

[14p-K304-10] Highly Sensitive Detection of Stimulated Brillouin Phase-Shift with Free-Running Local Oscillator

〇Wataru Imajuku¹, Taiga Shiraki¹, Ryo Ito¹ (1.Kindai University)

Keywords:

Optical Fiber Sensor,Brillouin Scattering,Coherent Detection

Brillouin optical fiber sensors are widely used as a means of detecting temperature and tension changes in structures. This research aims to realize highly sensitive Brillouin optical fiber sensors with a sensing length of 100 km class, and aims to apply digital coherent detection technology. In this study, we report on the application of a narrow-linewidth free-running local oscillator with a power output of 9 dBm to a phase diversity optical detector, and the realization of a means to detect the Brillouin phase shift with high sensitivity while regenerating the probe light phase.