Method of measuring beat length of polarization maintaining optical fiber
A polarization-maintaining fiber, testing optical path technology, applied in testing optical performance and other directions, can solve problems such as low spatial resolution, complex testing system, poor accuracy and repeatability, and achieve accurate results, short testing time, and saving testing costs.
Inactive Publication Date: 2010-11-03
ZHEJIANG UNIV
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Problems solved by technology
White light interferometry is based on the optical coherence domain polarization test technology, which can accurately measure the optical fiber beat length, and the test accuracy can reach 0.01mm, but the test system is relatively complicated
The Rayleigh scattering method is simple and easy to implement, but has low spatial resolution, poor accuracy and repeatability
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Embodiment Construction
[0020] The present invention will be further described below in conjunction with the accompanying drawings and examples.
[0021] Polarization maintaining fiber test steps are as follows:
[0022] 1) Test optical path construction: PM-SM fusion splicing of wide-spectrum light source 1 pigtail and polarizer 2 input fiber; PM_PM 45° fusion splicing of polarizer pigtail 3 and polarization-maintaining fiber 5 to be tested; The polarization-maintaining optical fiber is connected to the polarization degree tester 6 through an FC optical fiber connector. For fiber splicing, Fujikura’s FSM-40PM polarization-maintaining fiber splicing machine is used. The wide-spectrum light source 1 used in the experiment is SLD, and its normalized autocorrelation function coherence time τ c = λ ‾ 2 4 πcΔλ , The central wavelength λ...
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The invention discloses a method of measuring beat length of polarization maintaining optical fiber comprising three steps: 1) setting up test light path: broad light emitted from broad light source, via a polarizer of tail optical fiber of polarization maintaining optical fiber, through PM_PM optical melting point, enters polarization maintaining optical fiber to be tested and is connected with adegree of polarization tester via an optical fiber connector; 2) test of length of polarization maintaining optical fiber to be tested and degree of polarization data: opening the degree of polarization tester, recording degree of polarization data displayed on the tester; picking up the optical fiber to be tested from the optical fiber connector, measuring length of polarization maintaining optical fiber to be tested and recording the same; then introducing short polarization maintaining optical fiber to be tested to the optical fiber connector, then recording degree of polarization data displayed on the tester again and length of optical fiber until the length is zero; 3) function parametric fitting, acquiring beat length of polarization maintaining optical fiber to be tested. The invention uses depolarization theory of board light and less cost broad light source as well as degree of polarization tester, which is short in test time and accurate in result.
Description
technical field [0001] The invention relates to a method for measuring polarization-maintaining optical fiber parameters, in particular to a method for measuring the beat length of polarization-maintaining optical fiber. Background technique [0002] Polarization-maintaining fiber has a strong ability to maintain linear polarization, which can keep the polarization state of linearly polarized light unchanged during transmission, making polarization-maintaining fiber widely used in polarization-related coherent optical communications, optical fiber sensing, and optical information processing. It is becoming more and more widespread and is the most widely used fiber type at present. Beat length is a very important parameter to characterize the birefringence of optical fiber, and it needs to be accurately measured in the production and application of optical fiber. [0003] There are many types of beat length measurement methods, the representative measurement methods are Rayl...
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IPC IPC(8): G01M11/02
Inventor 苑鲁超王冬云舒晓武刘承车双良
Owner ZHEJIANG UNIV