Coherent spectrum analysis device and method based on optical fiber Rayleigh scattering
A technology of coherent spectroscopy and Rayleigh scattering, which is applied in the fields of precision instrument manufacturing and precision test and measurement, and can solve the problems that spectral analysis devices and methods cannot meet the spectral measurement requirements of new photonic devices
Active Publication Date: 2020-10-27
HARBIN INST OF TECH
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[0003] The present invention addresses the problem that the above-mentioned spectral analysis device and method cannot meet the spectral measurement requirements of new photonic devices, and its purpose is to provide a coherent spectral analysis based on optical fiber Rayleigh scattering that can be used for femtometer-scale fine spectral measurement Device and method
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[0016] Below in conjunction with accompanying drawing, specific embodiment of the present invention is described in further detail:
[0017] A coherent spectrum analysis and measurement device based on optical fiber Rayleigh scattering, such as figure 1 As shown, it includes a tunable laser (1), a light source to be tested (2), an optical coupler (3), an optical isolator (4), an erbium-doped fiber amplifier EDFA (5), a polarization controller (6), and an optical ring device (7), time delay optical fiber (8), optical attenuator (9), optical attenuator (10), optical coupler (11), balance detector (12), radio frequency filter (13) and data acquisition module (14), it is characterized in that: described optical coupler (3) is connected with tunable laser (1), erbium-doped fiber amplifier EDFA (5) and optical attenuator (10) through single-mode fiber and forms path, and described optical ring Device (7) is connected with erbium-doped fiber amplifier EDFA (5), time-delay fiber (8) ...
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The invention discloses a coherent spectrum analysis measuring device and method based on optical fiber Rayleigh scattering, whichbelong to the technical field of precise instrument manufacturing andprecise testing and metering. The structure of the device is as follows: the optical coupler is connected with the tunable laser, the erbium-doped fiber amplifier and the optical attenuator; a to-be-detected light source is connected with a time-delay optical fiber after passing through an optical isolator and a polarization controller, an optical circulator is connected with an erbium-doped optical fiber amplifier and the time-delay optical fiber, a balance detector is connected with an optical coupler and a radio frequency filter, and a data acquisition module is connected with the radio frequency filter. The measuring method comprises the following steps thatthe tunable laser indirectly generates local oscillation light and pump light, the pump light forms an optical fiber, the backscattering filter filters a signal to be detected, a filtering result and the local oscillation light are subjected to heterodyne interference to generate a beat frequency signal, secondary filtering is carried out through the radio frequency filter, and the spectrum of the light source to be detected can be restored by using the reserved Rayleigh beat frequency signal. The device has the characteristics of high resolution, high signal-to-noise ratio, no limitation of a mirror image effect and real-time detection of light to be detected.
Description
technical field [0001] The invention belongs to the technical field of precision instrument manufacturing and precision testing and measurement, and in particular relates to a coherent spectrum analysis device and method based on optical fiber Rayleigh scattering. Background technique [0002] With the development of a group of photonic devices (optical whispering gallery mode sensors, femtosecond optical frequency combs) with femtometer-level fine spectral response in the fields of optical sensing, material analysis, medical diagnosis and environmental monitoring, for high-resolution Demand for force spectroscopy devices has grown dramatically. In the previous spectral analysis devices and methods, the Fourier transform spectrometer based on the principle of interference modulation and the grating spectrometer based on the principle of diffraction dispersion are limited by the processing accuracy of the spectroscopic element, and the highest spectral resolution can only rea...
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IPC IPC(8): G01J3/45G01J3/12G01N21/31
CPCG01J3/45G01J3/12G01N21/31
Inventor 崔继文党竑张素文孙逊徐在斌谭久彬
Owner HARBIN INST OF TECH