Acoustic frequency detection based on phase optical time domain reflectometer system with Raman powe

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The present invention relates to a time domain light reflection long-distance acoustic frequency detection system based on a phase analysis through Raman light amplification. According to the present invention, a high-output high-quality pulse light source having long coherency through high coherence is required to sense a long-distance acoustic frequency through a phase analysis, and a low output high-quality continuous wave light source at low costs replacing the high-output high-quality pulse light source at high costs oscillates a high-output high-quality pulse through a Raman pump, a light amplitude modulator, and a rear-earth added optical fiber and a single mode optical fiber which are a gain medium. A Rayleigh back scattering signal generated by inserting the generated high-output high quality pulse to a Rayleigh scattering induction optical fiber interferers with a continuous wave signal with light to detect an external environment change generated at a specific position of the Rayleigh scattering induction optical fiber through a high-speed balance light detector. Therefore, a frequency generated outside which cannot be measured in the existing time domain light reflection system can be detected, and a high signal-to-noise ratio can be obtained by a high-output high-quality pulse generated by using Raman light amplification instead of using an Erbium added optical fiber light amplifier.COPYRIGHT KIPO 2018