High precision optical fiber grating wave length demodulation system
A wavelength demodulation and fiber grating technology, applied to broadband demodulation, can solve the problems of low accuracy and signal-to-noise ratio, large bandwidth, and low cost, and achieve broad market prospects, fast response speed, and easy productization
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[0027] A fiber grating wavelength demodulation system, the demodulation system includes: a broadband light source 1, a tunable filter 2, a first 1×2 coupler 7, a 1×2 coupler 11, an etalon filter 6, a reference grating 10 and the wavelength calibration module composed of the second photodetector 4, the second 1×2 coupler 8, the first photodetector 3, the 1×N optical switch 5, and the signal processing system 9; the connection between the devices formed by it :
[0028] The output terminal of the broadband light source 1 is connected to the input terminal of the tunable filter 2, the output terminal of the tunable filter 2 is connected to the input terminal of the first 1×2 coupler 7, and the other output terminal of the first 1×2 coupler 7 is connected to the second An output end of the second 1×2 coupler 8; the other output end of the second 1×2 coupler 8 is connected to the signal processing system 9 through the first photodetector 3; the input end of the second 1×2 coupler 8...
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