Patent ID: 9163960
Filing Date: 2015-10-20
Classification: G01D,G01J

Abstract:
1. A long-distance polarization and phase-sensitive optical time-domain reflecometer of a distributed Raman amplification based on optical fiber random lasers generated by unilateral pumps, comprising: a laser, an acousto-optic modulator, an arbitrary waveform generator for supplying said acousto-optic modulator with triggering pulses, an erbium-doped fiber amplifier, a circulator, a 1365 nm pump laser source, sensing optical fibers, a 1455 nm fiber Bragg grating, a wavelength division multiplexer, a band-pass filter, a 3 dB coupler, a polarization beam splitter, a photoelectric detector array and a multi-channel A/D data collector, wherein an output terminal of said laser and an input terminal of said acousto-optic modulator are connected; an output terminal of said acousto-optic modulator and an input terminal of said erbium-doped fiber amplifier are connected; an output terminal of said erbium-doped fiber amplifier and a first input terminal of said circulator are connected; a second output port of said circulator and a first input terminal of said wavelength division multiplexer are connected; a public port of said wavelength division multiplexer and a first end of said sensing optical fibers are connected; a second end of said sensing optical fibers and an input terminal of said 1455 nm fiber Bragg grating are connected; an output terminal of a third port of said circulator and an input terminal of said band-pass filter are connected; an output terminal of said band-pass filter and an input terminal of said 3 dB coupler; a first output terminal of said 3 dB coupler and an input terminal of said polarization beam splitter are connected; a second output terminal of said 3 dB coupler is directly connected to said photoelectric detector array; one of output terminals of said polarization beam splitter is connected to an input terminal of said photoelectric detector array; an output terminal of said photoelectric detector array and said multi-channel A/D data collector on PC are connected; and said random lasers are generated in said sensing optical fibers via a combination of said 1365 nm pump laser source, said sensing optical fibers and said 1455 nm fiber Bragg grating.