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Brillouin optical-time-domain analyzer based on coherence dual-pulse pair sequence technology and method for restraining common-mode noise by utilizing same

An optical time-domain analyzer and double-pulse technology, applied in the optical field, can solve the problems of low spatial resolution, long measurement signal time, and low signal-to-noise ratio.

Active Publication Date: 2014-09-03
HARBIN INST OF TECH
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Problems solved by technology

[0005] In order to solve the problems of low spatial resolution, long measurement signal time and low signal-to-noise ratio of the existing Brillouin optical time domain analyzer, the present invention proposes a Brillouin optical time domain analyzer based on coherent double pulse pair sequence technology and The Method of Suppressing Common Mode Noise Using the Analyzer

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  • Brillouin optical-time-domain analyzer based on coherence dual-pulse pair sequence technology and method for restraining common-mode noise by utilizing same
  • Brillouin optical-time-domain analyzer based on coherence dual-pulse pair sequence technology and method for restraining common-mode noise by utilizing same
  • Brillouin optical-time-domain analyzer based on coherence dual-pulse pair sequence technology and method for restraining common-mode noise by utilizing same

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specific Embodiment approach 1

[0054] Specific implementation mode 1. Combination figure 1 , Figure 4 Describe this embodiment, the Brillouin optical time-domain analyzer based on the coherent double pulse pair sequence technology described in this embodiment, the analyzer includes a laser 1, a No. 1 fiber coupler 2, a No. 1 polarization controller 3, and a No. 2 polarization controller. Controller 4, adjustable DC power supply 5, No. 1 electro-optic modulator 6, field programmable logic gate array 7, microwave generator 8, No. 2 electro-optic modulator 9, photoelectric conversion circuit 10, and No. 2 fiber coupler 11 , fiber Bragg grating 12, No. 1 fiber circulator 13, erbium-doped fiber amplifier 14, data acquisition card 15, fiber isolator 16, polarization scrambler 17, photodetector 18, No. 2 fiber circulator 19 and sensing fiber 20 ;

[0055] The continuous laser light emitted by the laser 1 is divided into two beams of continuous light by the No. 1 fiber coupler 2, and the two beams of continuous ...

specific Embodiment approach 2

[0060] Embodiment 2. This embodiment is a further description of the Brillouin optical time domain analyzer based on coherent double pulse pair sequence technology described in Embodiment 1. The laser 1 is a tunable laser or a distributed feedback semiconductor laser.

specific Embodiment approach 3

[0061]Embodiment 3. This embodiment is a further description of the Brillouin optical time-domain analyzer based on coherent double pulse pair sequence technology described in Embodiment 1. The sensing fiber 20 is a single-mode fiber or a polarization-maintaining fiber.

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Abstract

The invention relates to a Brillouin optical-time-domain analyzer based on a coherence dual-pulse pair sequence technology and a method for restraining common-mode noise by utilizing the same, belongs to the field of optics, and solves the problems that a traditional Brillouin optical-time-domain analyzer is low in spatial resolution, long in measuring signal time and low in signal-to-noise ratio. A laser is adopted, an upper branch of light divided by an optical-fiber coupler I is used as pump light, pulse pairs with different pulse widths can be periodically generated by a field-programmable logic array in a programming manner, and the pulse pairs are continuously and optically modulated to form a coherence pulse pair sequence through a photoelectric modulator; a lower branch provides detection light, the detection light enters a photoelectric modulator after a polarization state is adjusted, upper marginal frequency light and lower marginal frequency light which having the frequency difference of Brillouin frequency shifting gamma B are generated on the basis of carrier light, the pump light consisting of the coherence pulse pair sequence and the modulated detection light has a Brillouin scattering phenomenon in a sensing optical fiber, and two Brillouin signals are detected by a photoelectric detector. The Brillouin optical-time-domain analyzer and the method are suitable for restraining the common-mode noise.

Description

technical field [0001] The invention belongs to the optical field, and relates to a time-domain analyzer based on coherent double-pulse pair sequence technology and a method for suppressing common-mode noise by using the analyzer. Background technique [0002] In recent years, as a typical representative of distributed optical fiber sensing technology, Brillouin optical time domain analyzer has received extensive attention and has been effectively applied in many fields. Compared with other optical fiber sensing instruments, the Brillouin optical time domain analyzer has the advantages of high spatial resolution, ultra-long-distance sensing, and dynamic measurement, and can simultaneously perform high-precision measurement of physical quantities such as temperature and micro-strain. Since the optical fiber is used as both a sensor device and a signal transmission channel, and the optical signal is used as the transmission signal, the structural cost can be effectively reduce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353G01D3/036
Inventor 董永康滕雷吕志伟
Owner HARBIN INST OF TECH
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