Star type optical fiber grating sensing network based on CDMA multiplexing and demodulation method
A fiber grating and code division multiple access technology, which is applied in the field of demodulation of star fiber grating sensor network, can solve problems such as being unfavorable to improve the signal-to-noise ratio of the system, unable to meet the requirements of system expansion, and unfavorable for long-distance measurement.
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[0112] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0113] figure 1 Among them, a star fiber grating sensor network based on code division multiple access, it has a broadband light source, the broadband light source is connected to the input end of n parallel encoding / sensing grating units, these encoding / sensing grating units The output end of the sensor is connected to the autocorrelation digital demodulator through a star coupler; the central wavelengths of all encoding / sensing grating units are in the flat region of the power spectrum of the broadband light source.
[0114] figure 2 Among them, the star fiber grating sensor network based on code division multiple access has the same number of broadband light sources as the number of encoding / sensing grating units. input connection.
[0115] The encoding / sensing grating unit is composed of multiple fiber gratings connected in series. The broadband...
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