Method of comprehensively evaluating polarization maintaining optical fiber characteristic by using distributed polarization crosstalk analyzer and apparatus thereof

Abstract

A method of measuring a polarization correlation parameter of a doubly-refractive material and an apparatus are disclosed. The method comprises the following steps of presetting a series of polarization crosstalk peaks with known distance periods along a length of the doubly-refractive material; introducing probe light and entering into the doubly-refractive material, and detecting the probe light from the doubly-refractive material; processing the detected probe light so as to determine a sensed polarization crosstalk peak position with the known distance period and a width; and using the acquired polarization crosstalk peak position with the known distance period and the width to extract one or more polarization correlation parameters of the doubly-refractive material.

Description

technical field [0001] The present invention relates to devices, systems and techniques for measuring polarization properties of light, including polarization-related parameters in polarization-maintaining optical fiber links, in optical materials and devices. technical background [0002] In various optical devices, optical systems and optical information applications, the polarization characteristics of light are an important parameter of optical signals. The polarization properties of the optical signal can be changed by transmitting the optical signal through an optical medium with optical birefringence, wherein light with different polarizations in the medium will experience different indices of refraction. For example, in different optical fibers, some fibers have optical birefringence, so light will change its polarization characteristics when it is transmitted in such fibers. Usually, the birefringence in the optical fiber will change with time, for example, when th...

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Problems solved by technology

For example, optical fibers used in optical networks and fiber optic communication links, such as the ITU-T G.652 single-mode fiber optic cable recommended by the International Telecommunication Union, suffer from fiber bending or stress loss, which may affect the performance and reliability of the fiber

The bending or strain of this fiber can be measured in various ways, including using commercially available multi-wavelength Optical Time Domain Reflectometers (OTDR), for example at 1310nm or 1550nm, in order to distinguish bending loss from other types of loss, such as breakage , connection loss, etc., usually using different bending loss information measured at different wavelengths, usually bending loss is higher at short wavelengths than at long wavelengths

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