Device for Brillouin optical time domain reflectometer based on optical phase-locked ring
An optical time domain reflectometer and phase-locked loop technology, applied in spectrum investigation and other directions, can solve the problems of low measurement accuracy, unstable output, and inability to tune the output frequency, and achieve the effect of solving complex processing, reducing costs, and simplifying the system.
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[0010] Specific implementation mode 1: Combination figure 1 To explain this embodiment, the device of the Brillouin optical time domain reflectometer based on the optical phase-locked loop described in this embodiment is composed of No. 1 laser 1-1, No. 2 laser 1-2, No. 1 fiber coupler 2- 1. No. 2 fiber coupler 2-2, No. 3 fiber coupler 2-3, No. 4 fiber coupler 2-4, PLL module 3, electro-optic modulator 4, scrambler 5, circulator 6, optics Attenuator 7, No. 1 erbium-doped fiber amplifier 8-1, No. 2 erbium-doped fiber amplifier 8-2, optical filter 9, double-balanced detector 10, band-pass filter 11, data acquisition module 12, detection amplification module 13 It is composed of pulse generator 14, the output end of No. 1 laser 1-1 is connected with the optical signal input end of No. 1 fiber coupler 2-1, and the optical signal output end of No. 1 fiber coupler 2-1 is simultaneously connected with the electro-optic modulator 4 is connected with the optical signal input end of the ...
Example Embodiment
[0012] Specific implementation manner two: combination figure 2 This embodiment is described. This embodiment further defines the device of the Brillouin optical time domain reflectometer based on the optical phase-locked loop described in the first embodiment. The phase-locked loop module 3 is composed of a directional coupler 3-1 and a frequency divider. It is composed of 3-2, phase / frequency discriminator 3-3, reference signal source 3-4, loop filter 3-5 and frequency counting unit 3-6. The electric signal input terminal of directional coupler 3-1 is a lock The electrical signal input terminal of the phase loop module 3, the output terminal of one signal of the directional coupler 3-1 is connected with the signal input terminal of the frequency divider 3-2, and the output terminal of the other signal of the directional coupler 3-1 is connected with The input terminal of the frequency counting unit 3-6 is connected; the signal output terminal of the frequency divider 3-2 is ...
Example Embodiment
[0015] Embodiment 3: This embodiment further defines the device of the Brillouin optical time domain reflectometer based on the optical phase-locked loop described in Embodiment 1. Both the first laser 1-1 and the second laser 1-2 use Single frequency narrow linewidth fiber laser, distributed feedback semiconductor laser or external cavity semiconductor laser.
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