Device and method for calibrating cut-off wavelength of polarization maintaining optical fiber

Abstract

The invention provides a device for calibrating cut-off wavelength of a polarization maintaining optical fiber and solves the problem that wide spectral range polarized light which respectively measures the cut-off wavelength of fast and slow axes of the polarization maintaining optical fiber can not be generated in prior art. The device comprises a variable wavelength program control light source, a linear polarization polarizer, a counter axis coupling system, an optical fiber test table, a microstress optical fiber fixture, an optical fiber power meter and a computer, wherein the counter axis coupling system comprises a flange plate, a polarization maintaining optical fiber patch cord and a polarization maintaining optical fiber fusion splicer. According to the device, requirements of a special structure of the polarization maintaining optical fiber for measuring the cut-off wavelength are fully considered, output of the wide spectral range polarized light for measurement is achieved by taking targeted measures, the coupling problem of polarization maintaining optical fiber counter axes is solved, respective measurement of cut-off wavelength parameters of the fast and slow axes of the polarization maintaining optical fiber is achieved, and measurement accuracy is improved; and when the counter axis coupling system is not used, the device can be also used for measuring cut-off wavelength of a single mode fiber, and the whole calibration device is easy to operate and maintain and good in stability.

Description

technical field [0001] The invention relates to the technical field of metrology testing and calibration, in particular to a polarization-maintaining optical fiber cut-off wavelength calibration device and a calibration method thereof. Background technique [0002] Polarization-maintaining fiber is a special single-mode fiber that achieves the purpose of polarization maintenance by introducing a doped stress region into the fiber structure to make it have a large birefringence characteristic. Due to its strong polarization-maintaining ability for linearly polarized light, polarization-maintaining fibers are widely used in optical fiber sensing systems and optical fiber communications. The cut-off wavelength indicates the wavelength range of light in a single-mode operation in the fiber, and is the maximum wavelength at which the second-lower-order mode can be transmitted. As a basic parameter of single-mode fiber, the cut-off wavelength is an important measure of fiber tran...

AI Technical Summary

Problems solved by technology

[0005] The invention proposes a polarization-maintaining optical fiber cut-off wavelength calibration device, which solves the problem in the prior art that it is impossible to generate polarized light in a wide spectral range and measure the cut-off wavelengths of the fast and slow axes of the polarization-maintaining optical fiber separately.

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