BRILLOUIN FREQUENCY SHIFT DISTRIBUTION MEASUREMENT SYSTEM, BRILLOUIN FREQUENCY SHIFT DISTRIBUTION MEASUREMENT DEVICE, BRILLOUIN FREQUENCY SHIFT DISTRIBUTION MEASUREMENT METHOD, AND BRILLOUIN FREQUENCY SHIFT DISTRIBUTION MEASUREMENT PROGRAM

摘要

PROBLEM TO BE SOLVED: To measure the power of a probe light amplified by simulated Brillouin scattering a number of times and finding the average of N sessions of observed complex amplitudes, thereby effectively suppressing noise at the time of observation, expanding the dynamic range of measurement, and extending the distance of measurement.SOLUTION: A Brillouin frequency shift distribution measurement system according to the present invention comprises a probe light control unit for successively changing the optical frequency of a second laser in accordance with Brillouin frequency shift and generating a probe light, and a coherent detection unit 7 for coherently detecting a local light and the probe light, the system introducing a pump light and the probe light from directions opposite to each other, measuring the degree of amplification of the probe light due to simulated Brillouin scattering by the probe light control unit while also measuring the distribution of Brillouin frequency shifts, receiving the complex amplitude of the probe light by the coherent detection unit 7, and averaging the plural sessions of complex amplitudes.SELECTED DRAWING: Figure 1