High-spatial-resolution optical frequency domain reflectometer system based on 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: 2014-03-26
宁波联河光子技术有限公司
View PDF7 Cites 7 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[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
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0033]Figure 1 shows a basic schematic diagram of the system structure described in this embodiment. The first laser FL1 is connected to the Mach-Zehnder modulator MZ-modulator, and outputs an optical comb with multiple sidebands after modulation. Through the designed and matched fiber Bragg grating FBG and tunable filter BPF, the required sideband can be filtered out at a higher rejection ratio. The optical power is amplified by the erbium-doped fiber amplifiers EDFA1 and EDFA2 and the noise is filtered by the optical filters BPF1 and BPF2, and the filtered high-order frequency-swept sidebands with sufficient high power are used as pump light, and the signal light is generated by the second laser FL2. The four-wave mixing process occurs when the two lights pass through the highly nonlinear fiber HNLF. The idle frequency light generated by four-wave mixing is filtered by the narrow-band optical filter BPF3, and then amplified by the erbium-doped fiber amplifier EDFA3 as a fre...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
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 fiber optics, distributed fiber optic sensing, optical reflectometer, etc., and in particular relates to a high spatial resolution optical frequency domain reflectometer system based on a four-wave mixing process. Background technique [0002] Optical fiber sensing technology is developed rapidly along with the development of optical fiber communication technology. It uses light wave as carrier and optical fiber as medium to perceive and transmit external measured signals. Electronic sensors have been the standard mechanism for measuring physical and mechanical phenomena for decades. Despite their widespread use, electronic sensors have limitations that make them unsafe, impractical, or impossible to use in many applications. Optical fiber is characterized as insulating, passive, immune to noise generated by electromagnetic interference, and capable of transmitting ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
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