Single-end fast distributed Brillouin optical time domain reflectometer based on optical chirp chain
An optical time domain reflection and distributed technology, applied in the optical field, can solve the problem of long measurement time, achieve ultra-fast measurement and increase the frequency sweep range.
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[0028] Specific implementation mode 1: Combination figure 1 Detailed description of this embodiment, the single-ended fast distributed Brillouin optical time domain reflectometer based on the optical chirp chain described in this embodiment includes a laser, a first electro-optic modulator, a pulse module, a bait-doped fiber amplifier 1, Circulator 2, second electro-optic modulator, chirp chain module, first filter 3, balanced detector, filter detection module and acquisition module; the laser is a distributed feedback fiber laser with an output wavelength of 1550nm.
[0029] The laser output from the laser is divided into 2 paths by a 50:50 coupler, one light is used to generate 10ns pulse pump light, and the other light is used to generate down-frequency shift reference light;
[0030] The light is modulated into pulsed light by the first electro-optic modulator, the pulse signal of the first electro-optic modulator is provided by the pulse module, the first electro-optic modulato...
Example Embodiment
[0036] Specific implementation manner two: combination figure 2 This embodiment is described in detail. This embodiment is a further description of the single-ended fast distributed Brillouin optical time domain reflectometer based on the optical chirp chain described in the first embodiment. In this embodiment, in this embodiment , The first filter 3 is implemented by fiber Bragg grating FBG.
Example Embodiment
[0037] Specific implementation mode three: combination image 3 Detailed description of this embodiment, this embodiment is a further description of the single-ended fast distributed Brillouin optical time domain reflectometer based on the optical chirp chain described in the first embodiment. In this embodiment, the first filter 3 It is realized by injection locking laser.
[0038] In this embodiment, the injection locking technology is used to realize the generation of the optical chirp chain, which ensures that the output amplitude of the optical chirp chain is flatter. The optical chirp signal light enters the injection-locked laser through the optical circulator. The injection-locked laser has the functions of filtering, amplifying and ensuring the same output amplitude at different frequencies. The injection-locking laser filters the lower sideband as the reference light and outputs it through the optical circulator.
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