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A calibration device for optical coherent polarization measurement and its dynamic range calibration method

A calibration device and optical coherence technology, applied in the direction of testing optical performance, etc., can solve the problem of no improvement in measurement sensitivity performance, and achieve the effect of weakening the influence of the beam, widening the calibration range and reducing the influence.

Active Publication Date: 2018-08-31
HARBIN ENG UNIV
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Problems solved by technology

The main problem to be solved is how to improve the accuracy and stability of polarization crosstalk measurement, and the measurement sensitivity performance has not improved

Method used

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  • A calibration device for optical coherent polarization measurement and its dynamic range calibration method
  • A calibration device for optical coherent polarization measurement and its dynamic range calibration method
  • A calibration device for optical coherent polarization measurement and its dynamic range calibration method

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with accompanying drawing:

[0045] The invention provides a calibration device for optical coherent polarization measurement and a calibration method for its dynamic range. The high-precision calibration device includes a polarizer, a polarization analyzer, a polarization-maintaining optical fiber, multiple polarizers (analyzers) with a high-precision calibration function, and multi-section polarization-maintaining optical fibers for specific length and angle welding. The calibration method is as follows: through the selection of the length of the polarizer (analyzer) polarization-maintaining pigtail and polarization-maintaining fiber and the welding angle, the first-order interference peak and the second-order interference peak are respectively used for the small extinction ratio (0 ~ -40dB) , Large extinction ratio (-40 ~ -100dB) for precise calibration. In the case of only using the polarizer (ana...

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Abstract

The invention belongs to the technical field of optical fiber measurement, and particularly relates to a calibration device for optical coherence polarization measurement and a dynamic range calibration method thereof. The device comprises a broadband optical source and power monitoring device 510, a first optical fiber connector 521, a second optical fiber connector 522, a high-precision calibration device 530, an optical path correlator 540, and a polarization crosstalk detection and signal recording device 550. A polarization-maintaining optical fiber with a specific length and an alignment angle is used for building a calibration device, and the position and the magnitude of a measurement peak are precisely positioned; by using two-order interference peaks of multiple crosstalk points, a low peak value is precisely positioned; and by using different calibration gradients, the calibration precision and the accuracy are improved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber measurement, and in particular relates to a calibration device for optical coherent polarization measurement and a dynamic range calibration method thereof. Background technique [0002] Polarization optical devices are an important part of high-precision optical measurement and sensing systems. At present, the performance testing and evaluation methods and devices of optical devices are backward, which seriously hinders the development of high-precision optical measurement and sensing systems. For example, the chip extinction ratio of lithium niobate integrated waveguide modulator (commonly known as Y waveguide), the core device of high-precision fiber optic gyroscope, has reached more than 80dB; The rate is around 50dB (according to the definition of energy, it is 10 5 ), the highest resolution is the Model 4810 polarization extinction ratio developed by dBm Optics of the United States, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M11/02
CPCG01M11/02
Inventor 苑勇贵梁帅杨军吴冰彭峰李创喻张俊苑立波
Owner HARBIN ENG UNIV
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