| 摘要 |
PROBLEM TO BE SOLVED: To provide a fiber sensor system capable of high resolution measurement of frequency change. SOLUTION: An end injection fiber laser outputting a plurality of laser modes is installed. An optical fiber 14 transferring a laser mode is connected with an active fiber sensor 16. The optical fiber 14 transfers a multiple laser mode to an optical amplifier fiber 22, An optical amplifier fiber 22 amplifies a laser mode signal. The amplified laser mode signal is sent to a phase modulator 34 connected with the optical fiber. An output from the phase modulator is sent to receiving interferometer 36, which has a specified pass in balance, and analyzes the respective frequency changes of the laser mode signal. A demodulation part 46 is connected with the interferometer 36, receives the output of the interferometer and demodulates the output. |
