Brillouin optical time domain analysis meter capable of locking frequencies of two lasers based on optical phase-locked loop
An optical time domain analyzer and laser technology, applied in the direction of using optical devices to transmit sensing components, etc., can solve the problems of high price, slow frequency scanning speed, complex structure, etc., and achieve the effect of simple structure, simplified system, and reduced cost.
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specific Embodiment approach 1
[0009] Specific implementation mode one: combine figure 1 Describe this embodiment, the Brillouin optical time domain analyzer based on the optical phase-locked loop to lock the frequency of two lasers in this embodiment, it is composed of No. 1 laser 1-1, No. 2 laser 1-2, and No. 1 optical fiber coupling 2-1, No. 2 fiber coupler 2-2, No. 3 fiber coupler 2-3, phase-locked loop module 3, electro-optic modulator 4, pulse generator 5, polarization scrambler 6, detection amplifier module 7, optical An attenuator 8, an erbium-doped fiber amplifier 9, a circulator 10, a photodetector 11 and a data acquisition module 12 are formed, and the output end of the No. 1 laser 1-1 is connected with the optical signal input end of the No. 1 fiber coupler 2-1. The optical signal output port of No. 1 fiber coupler 2-1 is connected with the optical signal input port of electro-optic modulator 4 and No. 3 fiber coupler 2-3 at the same time, and the output port of No. 2 laser 1-2 is connected with...
specific Embodiment approach 2
[0013] Specific implementation mode two: combination figure 2 and image 3 Describe this embodiment, this embodiment is a further limitation to the Brillouin optical time-domain analyzer based on the optical phase-locked loop locking the frequency of two lasers described in the first embodiment, the phase-locked loop module 3 is composed of a directional coupler 3- 1. Composed of frequency divider 3-2, phase / frequency discriminator 3-3, reference signal source 3-4, loop filter 3-5 and frequency counting unit 3-6, the electrical signal of directional coupler 3-1 The input end is the electrical signal input end of the phase-locked loop module 3, the output end of a signal of the directional coupler 3-1 communicates with the input end of the signal of the frequency divider 3-2, and another signal of the directional coupler 3-1 The output end of the frequency divider is communicated with the input end of the frequency counting unit 3-6; The output end of the signal of the freque...
specific Embodiment approach 3
[0016] Embodiment 3: This embodiment is a further limitation of the Brillouin optical time-domain analyzer based on the optical phase-locked loop to lock the frequency of two lasers described in Embodiment 1. No. 1 laser 1-1 and No. 2 laser 1 -2 adopts single-frequency narrow-linewidth fiber laser, distributed feedback semiconductor laser or external cavity semiconductor laser.
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