Improved phase generated carrier (PGC) demodulation method
A demodulation method and carrier phase technology, applied in the direction of using optical devices to transmit sensing components, etc., can solve the problems that the dynamic range and phase resolution cannot be expanded at the same time, the two algorithms cannot be run at the same time, and the phase resolution is degraded. Increase the phase resolution and dynamic range, eliminate the effect of associated amplitude modulation, and increase the dynamic range
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Embodiment 1
[0073] Embodiment 1——Dynamic range extension of phase demodulation system
[0074] Interferometer devices such as figure 2 As shown, the device selection and parameters of the interferometer measurement device are as follows:
[0075] (1) The central wavelength of the light source 201 is 1550nm, the half-spectrum width is greater than 45nm, and the fiber output power is 1mW-10mW;
[0076] (2) The working wavelength of the fiber optic isolator 222 is 1550nm±5nm, the insertion loss is ≤1.0dB (at 23°C working temperature), and the return loss is ≥55dB;
[0077] (3) The first 1×2 coupler 211, the second 1×2 coupler 223, and the third 1×2 coupler 224, the operating wavelength is 1550nm&1310nm, the splitting ratio is 50.5% / 49.5%, and the insertion loss of the two channels is 3.03dB respectively , 3.12dB;
[0078] (4) The piezoelectric ceramic used to load the calibration signal has a size of 24mm, a capacitance of 22nF, and a withstand voltage range of 0-120V;
[0079] (5) The ...
Embodiment 2
[0098] Example 2 - Suppression of amplitude modulation effect associated with PGC algorithm
[0099] The device selection and parameters of the PGC algorithm-associated amplitude modulation effect suppression measurement device are as follows:
[0100] (1) The central wavelength of the light source 201 is 1550nm, the half-spectrum width is greater than 45nm, and the fiber output power is 1mW-10mW;
[0101] (2) The working wavelength of the fiber optic isolator 222 is 1550nm±5nm, the insertion loss is ≤1.0dB (at 23°C working temperature), and the return loss is ≥55dB;
[0102](3) The first 1×2 coupler 211, the second 1×2 coupler 223, and the third 1×2 coupler 224, the operating wavelength is 1550nm&1310nm, the splitting ratio is 50.5% / 49.5%, and the insertion loss of the two channels is 3.03dB respectively , 3.12dB;
[0103] (4) The piezoelectric ceramic used to load the calibration signal has a size of 24mm, a capacitance of 22nF, and a withstand voltage range of 0-120V;
...
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