Optical path length determination method and device, signal controller, demodulation system and medium
A technology of signal controller and optical path length, which is applied in the field of optical fiber, can solve the problems of increasing equipment cost and achieve the effect of increasing equipment cost and reducing equipment cost
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Embodiment 1
[0042] figure 1 A schematic structural diagram of a demodulation system provided in Embodiment 1 of the present application, the demodulation system includes: a light source 10, a signal controller 20, a fiber circulator 30, a photodetector 40 and a fiber grating 50;
[0043] The signal controller 20 is connected with the input end of the light source 10 and the output end of the photodetector 40 respectively; the first end of the optical fiber circulator 30 is connected with the output end of the light source 10, and the second end of the optical fiber circulator 30 is connected with the fiber grating 50 , the third end of the optical fiber circulator 30 is connected to the input end of the photodetector 40 .
[0044] The fiber optic circulator 30 realizes the adjustment of the light wave propagation direction. After the light wave emitted by the light source 10 is incident on the first end of the fiber optic circulator 30, the light wave is transmitted to the fiber grating 5...
Embodiment 2
[0053] figure 2 It is a flow chart of a method for determining the optical path length provided in Embodiment 2 of the present application. This embodiment is applicable to the case of calculating the optical path length between a fiber grating and a light source. The method can be executed by an optical path determination device, which can use software and / or implemented by hardware, and specifically configured in an electronic device. The electronic device can be figure 1 Signal controller 20 in the demodulation system is shown.
[0054] see figure 2 The method for determining the optical path length shown is applied to the signal controller in the demodulation system, and specifically includes the following steps:
[0055] S110. Determine the central wavelength according to the initial reflection spectrum obtained after the linear scanning light wave is reflected by the fiber Bragg grating; wherein, the linear scanning wave is generated by the light source based on the...
Embodiment 3
[0082] Figure 4 It is a flow chart of a method for determining the optical path length provided in Embodiment 3 of the present application. The technical solution of this embodiment is further refined on the basis of the above technical solution.
[0083]Further, "determine the transmission duration according to the target harmonic signal and the reference harmonic signal" is refined into: "generate cross-correlation data according to the target harmonic signal and reference harmonic signal; determine the transmission duration according to the cross-correlation data ” to obtain the transmission duration by calculating the cross-correlation of signals in the time domain.
[0084] see Figure 4 A method for determining the optical path length shown includes:
[0085] S210. Determine the central wavelength according to the initial reflection spectrum obtained after the linear scanning light wave is reflected by the fiber Bragg grating; wherein, the linear scanning wave is gene...
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