Pulse optical signal generation method used for Brillouin optical time domain reflectometer (BOTDR) sensing system
A production method and technology of a sensing system, which are applied in the direction of using optical devices to transmit sensing components, etc., can solve the problems of reducing the sensing distance of the sensing system, reducing the spatial resolution and measurement accuracy of the distributed optical fiber sensing system, etc. The effect of improving spatial resolution and measurement accuracy
Inactive Publication Date: 2015-10-07
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology
If the pulse width of the pulse excitation light is too wide, the spatial resolution and measurement accuracy of the distributed optical fiber sensing system will be reduced; and due to the influence of the phonon lifetime, when the pulse width of the single pulse optical signal injected into the fiber is lower than 10ns will significantly reduce the sensing distance of the sensing system
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[0022] Such as figure 1 As shown, the continuous light with a central wavelength of 1550.00nm output by the narrow linewidth laser 1 passes through the optical isolator 2 and then is adjusted into linearly polarized light by the polarization controller 3. The linearly polarized light is input from the optical input end of the EOIM 4, and the EOIM 4 Driven by the adjustable DC voltage source 5 and the pulse modulation signal generation module 6, the narrow linewidth continuous laser light is modulated into pulsed light and output from its optical output port. The pulsed light is amplified by the EDFA 7 and then properly processed by the optical attenuator 8 Attenuation so that the pulsed light power is within the detectable light power range of the photodetector 9, and the pulsed light becomes an electrical signal that is easy to receive after photoelectric conversion and then input to the multi-channel oscilloscope 10 for waveform display;
[0023] Such as figure 2 As shown,...
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The present invention discloses a pulse optical signal generation method used for a BOTDR sensing system. A system involved in the method comprises a narrow linewidth laser, an optical isolator, a polarization controller, an electro-optic intensity modulator (EOIM), an adjustable DC voltage source, a pulse modulation signal generating module, an erbium-doped optical fiber amplifier (EDFA), an optical attenuator, a photoelectric detector and a multi-channel oscilloscope. The optical isolator is connected between the narrow linewidth laser and the polarization controller, the output end of the polarization controller is connected with the optical input end of the EOIM, and the output end of the EOIM is connected with the input end of the EDFA; the optical attenuator is connected between the output end of the EDFA and the optical input end of the photoelectric detector, and the output end of the photoelectric detector is connected with the oscilloscope; the adjustable DC voltage source is connected with the Bias end of the EOIM, and the output end of the pulse modulation signal generating module is connected with the radio frequency end of the EOIM. The ns-grade pulse light generated in the present invention is used as the excitation light in a distributed optical fiber sensing system and has the advantages of being able to adjust and control the pulse width and the repetition frequency.
Description
technical field [0001] The invention relates to a method for generating a signal, in particular to a method for generating a pulse light signal used in a BOTDR sensing system. Background technique [0002] The distributed optical fiber sensing system based on BOTDR (Brillouin Optical Time Domain Reflectometry) has strong anti-electromagnetic interference, good insulation performance, corrosion resistance, easy long-distance transmission, easy to form an intelligent network, and integrates information sensing and The remarkable characteristics of transmission in one body and continuous distributed measurement have attracted extensive attention. It has broad application prospects in the fields of oil pipelines, bridges, tunnels and submarine optical cables. In the BOTDR distributed optical fiber sensing technology, the first problem to be solved is to modulate the continuous laser light according to the actual transmission distance of the sensing fiber to obtain a pulsed ligh...
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IPC IPC(8): G01D5/26
Inventor 黎燕兵万生鹏
Owner NANCHANG HANGKONG UNIVERSITY