A high -spatial resolution light frequency domain reflection system based on the four -wave mixing process
An optical frequency domain reflectometer and high spatial resolution technology, which is applied in the direction of optical instrument testing, machine/structural component testing, using optical devices to transmit sensing components, etc. It can solve nonlinear frequency sweeping, slow light source modulation speed, etc. problem, to achieve the effect of improving the spatial resolution
Active Publication Date: 2015-12-02
宁波联河光子技术有限公司
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[0005] The purpose of the present invention is that in the OFDR system, in order to overcome the slow internal modulation speed of the light source and the possibility of nonlinear frequency sweep, the external modulation of the light source, such as the use of electro-optic modulators for single sideband modulation, can be used to achieve frequency sweep
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Embodiment 1
[0032] figure 1 A basic schematic diagram of the system structure described in this embodiment is shown. The first laser FL1 is connected to a Mach-Zehnder modulator MZ-modulator, and outputs an optical comb having multiple sidebands after modulation. With the designed and matched fiber Bragg grating FBG and tunable filter BPF, the desired sidebands can be filtered out at a higher rejection ratio. After the erbium-doped fiber amplifiers EDFA1 and EDFA2 amplify the optical power and filter the noise with the optical filters BPF1 and BPF2, the filtered high-order swept sideband with high enough power is used as the pump light, and the second laser FL2 generates the signal light, The four-wave mixing process occurs when the two lights pass through the high nonlinear fiber HNLF. The idler light generated by the four-wave mixing is filtered by the narrow-band optical filter BPF3, and then amplified by the erbium-doped fiber amplifier EDFA3 as a swept-frequency carrier light sour...
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The invention discloses a high-spatial-resolution optical frequency domain reflectometer system based on the four-wave mixing process. The high-spatial-resolution optical frequency domain reflectometer system comprises a sweep frequency light source system based on four-wave mixing, a testing light path system, a receiver and a signal processing system. A narrow-linewidth laser is used as an original light source of the sweep frequency light source system. High-order side-band sweep frequency light with a broadened sweep frequency range is generated by emergent light through external modulation. The sweep frequency range of the high-order side-band sweep frequency light is further expanded through the four-wave mixing process. In the four-wave mixing process, the side-band sweep frequency light is used as pump light, obtained idler frequency light has a sweep frequency range which is two times that of the pump light, and sweep frequency idler frequency light is obtained through filtering by a narrow-band optical filter. The sweep frequency idler frequency light is used as a sweep frequency carrier wave light source to be led into a light path system, optical signals which are backscattered and reflected are collected, and optical frequency domain reflection analysis is achieved through local coherent detection and signal processing. The sweep frequency range can be efficiently widened through the nonlinear optical fiber four-wave mixing process, and therefore the spatial resolution of an optical frequency domain reflectometer is increased.
Description
technical field [0001] The invention relates to the technical fields of electro-optical modulation, nonlinear optical fiber optics, distributed optical fiber sensing, optical reflectometer and the like, in particular to a high spatial resolution optical frequency domain reflectometer system based on a four-wave mixing process. Background technique [0002] Optical fiber sensing technology has developed rapidly with the development of optical fiber communication technology. It takes light wave as the carrier and optical fiber as the medium to sense and transmit the external measured signal. Electronic sensors have been the standard mechanism for measuring physical and mechanical phenomena for decades. Although widely used, electronic sensors have limitations and are not safe, practical, or useful in many applications. Optical fibers are characterized by being insulated, passive, immune to noise generated by electromagnetic interference, and capable of transmitting data over ...
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IPC IPC(8): G01D5/353G01M11/00
Inventor 杜江兵何祖源樊昕昱刘庆文谢峰马麟
Owner 宁波联河光子技术有限公司