Device and detecting method for restraining polarization crosstalk measuring noise by the adoption of light source

Abstract

The invention provides a device and detecting method for restraining polarization crosstalk measuring noise by the adoption of a light source. The device is composed of a broadband light source, a polarization device to be detected, an optical path correlator, a difference detecting device, an optical signal converting device and a signal recording device. The device is characterized in that the broadband light source is a low coherent light source with high degree of polarization, and a polarization device provided with high extinction ratio is arranged behind the light source. The detecting method comprises the steps that a polarization state controller is connected between the light source and the polarization device, and the polarizing angle of line polarization light and the polarization device are overlapped with each other seriously through adjusting the polarization state of the output light of the light source. According to the device, the high degree of polarization light source and the high extinction ratio polarization device are combined, the measuring noise in the optical coherent domain polarization can be restrained through increasing the extinction ratio of signal light injected into the device to be detected, and measuring accuracy to the device polarization feature of the device is improved. The device and detecting method for restraining polarization crosstalk measuring noise by the adoption of the light source are simple in structure, excellent in performance and easy to adjust, and can be widely applied to the field of high accuracy measuring and analyzing to optical performances of optical type polarization-maintaining devices and the like.

Description

technical field [0001] The invention relates to an optical fiber measurement device, in particular to a device for suppressing polarization crosstalk measurement noise by using a light source. Background technique [0002] Optical coherent domain polarization detection (OCDP) based on the principle of white light interference is one of the most promising optical fiber measurement technology solutions. According to the principle of white light interference, the structure of full polarization-maintaining optical fiber is adopted, and the optical fiber device can be coiled and the performance of the device is stable. The whole experimental device has the characteristics of small size and high stability. Optical coherent domain polarization (OCDP) compensates the optical path through the scanning Michelson interferometer to realize the interference between different coupling modes. It can locate the position of the internal defect of the optical fiber such as the mode coupling p...

AI Technical Summary

Problems solved by technology

The overlapping of optical noise and device polarization crosstalk signals will inevitably lead to misjudgment of the performance of the device under test, which will have a serious impact on the accuracy of polarization measurement in the optical coherent domain

If the light energy in the vertical direction of the light source is not limited, the amount of optical noise will increase and the amplitude will increase, which will cause the polarization crosstalk signal of high-performance devices to be indistinguishable, and equivalently reduce the measurement sensitivity

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