Y waveguide polarization characteristic parameter measurement method based on noise reduction processing
A measurement method and characteristic parameter technology, which is applied in the field of optical measurement, can solve problems such as unrealized measurement of polarization characteristic parameters, failure to realize distributed measurement of Y waveguide devices, etc.
Pending Publication Date: 2022-05-13
TIANJIN UNIV
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[0003] Chinese patent CN111337052A "A Y-waveguide parameter measuring instrument, measurement system and measurement method" discloses a method for measuring Y-waveguide parameters based on a traditional Sagnac interferometer, which can obtain parameters such as transit time and half-wave voltage. However, the measurement of polarization characteristic parameters has not been realized
Chinese patent CN104280216A "A Simultaneous Test Device for Dual-Channel Optical Properties of Y-Waveguide Devices and Its Y-Waveguide Polarization Crosstalk Recognition and Processing Method" discloses a method for simultaneously testing polarization crosstalk for dual-channel optical properties of Y-waveguide devices. Set output pigtails of different lengths to achieve simultaneous measurement of dual-channel data, but failed to achieve distributed measurement of Y-waveguide devices and obtain the values of multiple parameters at the same time
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[0050] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0051] Such as figure 1 As shown, it is an overall flow chart of a method for measuring Y waveguide polarization characteristic parameters based on noise reduction processing in the present invention.
[0052] Step 1. Build as figure 2 It is a schematic diagram of the polarization-maintaining optical fiber interferometry system of the present invention, including a light source module 1, a polarizer 2, a Y waveguide device 3, a polarizer 4, a 3dB coupler 5, an electronically controlled delay line 6, a Faraday rotation mirror 7, a photoelectric detector Device 8, data acquisition card 9 and computer 10. Among them: the light source module 1 is an ultra-broadband light source, the light emitted is linearly polarized light, and the tail end of the Y waveguide device 3 and the polarizer 4 are welded together at an ang...
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The invention discloses a Y waveguide polarization characteristic parameter measurement method based on noise reduction processing, and the method comprises the steps: 1, building a polarization-maintaining optical fiber interference measurement system, and collecting the scanning data of a polarization-maintaining optical fiber interference signal; step 2, performing noise reduction decomposition processing on the scanning data of the polarization maintaining optical fiber interference signal by using a CEEMDAN algorithm; step 3, setting an autocorrelation coefficient threshold to filter noise in the component of the polarization maintaining fiber interference decomposition signal after noise reduction decomposition processing, and reconstructing the signal; and step 4, calculating a PER value and tail fiber crosstalk of the Y waveguide. According to the invention, Y waveguide distributed polarization parameter measurement is realized, and a basis is provided for calibration and detection of a high-precision optical fiber gyroscope.
Description
technical field [0001] The invention relates to the field of optical measurement, in particular to a method for measuring Y-waveguide polarization characteristic parameters. Background technique [0002] Fiber optic gyroscope is an angular rate sensor based on the Sagnac effect. The lithium niobate optical modulation device, also known as the Y waveguide, is one of the important components of the fiber optic gyroscope. Its polarization extinction ratio (Polarization Extinction Ratio, PER) and pigtail crosstalk are important parameters that affect the accuracy of the fiber optic gyroscope. The polarization extinction ratio of the Y junction is the ratio of the energy coupled to the other axis of the linearly polarized light when it is transmitted in the polarization maintaining fiber to the main axis transmission. The larger the polarization extinction ratio, the stronger the dynamic modulation ability of the Y waveguide to light. Crosstalk means that during the transmission...
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Login to View More IPC IPC(8): G01C25/00G01C19/72G06K9/00
CPCG01C25/00G01C19/72G06F2218/04
Inventor 张红霞李天玥温国强贾大功刘铁根
Owner TIANJIN UNIV