Coherent brillouin light time domain analysis sensing system based on single-sideband modulation detection light

A technology of single sideband modulation and optical time domain analysis, applied in the direction of measuring devices, instruments, etc., can solve the problems of phase-to-intensity power fading, deterioration of Brillouin gain spectrum, and reduction of system performance, so as to suppress dispersion and reduce Demodulation error, the effect of improving the signal-to-noise ratio

Active Publication Date: 2015-08-05
闫连山 +1
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Problems solved by technology

However, these methods are based on double-sideband modulation, which are sensitive to the dispersion and self-phase modulation effects of the fiber

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  • Coherent brillouin light time domain analysis sensing system based on single-sideband modulation detection light
  • Coherent brillouin light time domain analysis sensing system based on single-sideband modulation detection light
  • Coherent brillouin light time domain analysis sensing system based on single-sideband modulation detection light

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the drawings.

[0022] figure 1 It is a schematic diagram of the structure of the Brillouin optical time-domain analysis sensing device of the present invention. As shown in the figure, the output center frequency of the tunable light source 1 is f 0 The optical carrier (center wavelength 1549nm), the optical carrier is divided into two parts by a 50:50 optical coupler 2. One part is externally modulated by the acousto-optic modulator 4 driven by the pulse signal generator 3 to generate pulsed light. The pulsed light is first amplified by the first erbium-doped fiber amplifier 5 and then filtered by the optical filter 6 to remove ASE noise as pulsed pump light and enter the sensing fiber 14 through the optical circulator 7. The other microwave signal generated by the microwave signal synthesizer 9 after passing through the polarization controller 8 is externally modulated by the electro-optical inte...

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Abstract

The invention discloses a coherent brillouin light time domain analysis sensing system based on single-sideband modulation detection light. In the device, sound and light intensity modulator external modulation optical carrier is driven by an electric pulse signal to generate pump light, and local light and detection light are obtained through two steps: 1) driving electro-optics intensity modulator external modulation same-frequency optical carriers working at linear work points by a 10-12GHz tunable microwave signal to generate two sidebands, and 2) filtering the upper sideband and reserving the lower sideband (the detection light) and the optical carrier (the local light). After interactions with the pump light in optical fibers, the detection light and the local light load brillouin gain spectrum information to a 10-12GHz high-frequency carrier wave through the photoelectric detection beat frequency to prevent baseband noise damage, and improve the signal to noise ratio of the whole device by utilizing coherent detection. The brillouin gain spectrum information is demodulated by a logarithmic detector, and then temperature information and strain information are further solved through a Lorentz fit on a brillouin gain spectrum.

Description

Technical field [0001] The invention relates to a coherent Brillouin optical time-domain analysis sensing device based on single-sideband modulation detection light, in particular to a Brillouin optical time-domain analysis sensor based on single-sideband modulation detection light and capable of coherent detection Analyze the sensing system. Background technique [0002] The use of Brillouin nonlinear effects in optical fibers for distributed optical fiber sensing has been extensively studied for decades. The core of this technology is that the Brillouin frequency shift of the optical fiber is linearly related to the temperature and deformation (stress) of the optical fiber. The temperature and stress sensing can be realized by solving the Brillouin frequency shift. In order to obtain the Brillouin frequency shift, pulsed pump light and continuous probe light will be injected separately from both ends of the fiber. The Brillouin gain range can be scanned by changing the frequen...

Claims

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Application Information

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IPC IPC(8): G01D21/02
Inventor 闫连山李宗雷邵理阳张志勇潘炜罗斌
Owner 闫连山
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