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Optical coherence polarization measuring device capable of restraining interferential noises

An optical coherence and measurement device technology, applied in the direction of testing optical performance, etc., can solve the problem of device performance measurement misjudgment, measurement cannot be carried out, etc., to increase the signal-to-noise ratio, overcome the polarization fading effect, temperature stability and anti-vibration stability. good effect

Active Publication Date: 2014-07-02
HARBIN ENG UNIV
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Problems solved by technology

If the optical noise and the interference peak of the measurement signal overlap each other, it will cause misjudgment of the performance measurement of the device, and in severe cases, the measurement cannot be carried out

Method used

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  • Optical coherence polarization measuring device capable of restraining interferential noises
  • Optical coherence polarization measuring device capable of restraining interferential noises
  • Optical coherence polarization measuring device capable of restraining interferential noises

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Embodiment Construction

[0042] In order to clearly illustrate the optical coherent polarization measuring device with optical noise suppression effect involved in the present invention, the present invention will be further described in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited by this.

[0043] Optical coherent polarization measurement devices such as figure 1 As shown, the parameter selection of the specific device is as follows:

[0044] (1) The central wavelength of the broadband light source 11 is 1550nm, the half-spectrum width is greater than 45nm, the output power of the fiber is greater than 2mW, the spectral ripple of the light source is <0.05dB (the peak amplitude is about -60dB), and the optical path range of the coherence peak is 4-7mm;

[0045] (2) 2 / 98 fiber coupler 12 working wavelength 1550nm, splitting ratio 2:98;

[0046] (3) Optical fiber isolator 16 has a working wavelength of 1550nm, inser...

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Abstract

The invention provides an optical coherence polarization measuring device capable of restraining interferential noises. The optical coherence polarization measuring device capable of restraining the interferential noises is composed of a high polarization stability broadband light source, an element to be detected, an optical path demodulator, a polarization crosstalk detector and a recording device. The optical path demodulator comprises a Faraday rotator for eliminating the optical interferential polarization fading effect and an optical circulator for detecting optical path difference, and polarization state controllers are arranged in front of the Faraday rotator and the optical circulator respectively. The polarization state of the transmitting light is adjusted to enable the polarization state of the input light to meet the minimum reflection condition under the Brewster angle, residue reflecting light signals in a device are reduced and eliminated, the optical interferential noises are restrained, and the polarization crosstalk measuring sensitivity is improved. The optical coherence polarization measuring device capable of restraining the interferential noises has the advantages of being high in measuring accuracy, wide in dynamic range, small in size, convenient to adjust, low in loss, and high in reliability, and can be applied to the optical performance quantitative test to high extinction ratio integration waveguide over 80 db and optical polarization devices.

Description

technical field [0001] The invention relates to an optical fiber measuring device, in particular to an optical coherent polarization measuring device with the function of suppressing optical interference noise. Background technique [0002] Optical coherent domain polarization measurement technology (OCDP) is a high-precision distributed polarization coupling measurement technology. It is based on the principle of wide-spectrum light interference. It uses a scanning optical interferometer to perform optical path compensation to achieve interference between different polarization modes. The spatial position of the polarization crosstalk and the intensity of the polarization coupling signal are measured and analyzed with high precision, and then important parameters such as the extinction ratio and the beat length of the optical polarization device are obtained. As a very promising detection method for distributed optical polarization performance, OCDP technology is widely use...

Claims

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Application Information

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IPC IPC(8): G01M11/02
Inventor 杨军柴俊苑勇贵吴冰彭峰苑立波
Owner HARBIN ENG UNIV
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