Method for implementing optical fiber grating autocorrelation digital demodulation by CDMA and system thereof
A fiber grating and code division multiple access technology, which is applied in the field of fiber grating autocorrelation digital demodulation and its system field by using code division multiple access, and can solve the problems of sensitive initial parameters of the system and complicated numerical solution process.
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[0149] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0150] figure 1 Among them, it includes a broadband light source, the broadband light source is connected to the input end of the coupler I, one output end of the coupler I is connected to a group of measuring units composed of sensor gratings, and the other output end is connected to the coupler II; the coupler One output end of II is connected to the modulation grating, while the other output end is connected to the modulation grating through the feedback control unit.
[0151] The measuring unit consists of several sensor gratings connected in series or in parallel.
[0152] The feedback control unit includes a photodetector PD, which matches the coupler II. The photodetector PD is connected to the operational amplifier OP. The OP is connected to the computer through the analog-to-digital converter, and the computer is connected to the digi...
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