A Method for Measuring Birefringence Dispersion of Polarization-Maintaining Optical Fiber
A polarization-maintaining optical fiber and measurement method technology, which is applied in the field of optical measurement, can solve the problems of extremely sensitive selection of filter parameters and the impossibility of finding polarization-maintaining optical fibers, etc., achieve short measurement time, high signal-to-noise ratio, and improve measurement accuracy Effect
Inactive Publication Date: 2016-06-08
TIANJIN UNIV
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Problems solved by technology
However, the birefringent dispersion measured by this method is extremely sensitive to the choice of filter parameters
Moreover, it is impossible to find a parameter selection method suitable for all polarization maintaining fibers
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[0038] figure 1 It is a flow chart of the polarization-maintaining optical fiber birefringence dispersion measurement method; figure 2 It is the polarization-maintaining optical fiber birefringence dispersion measurement system adopted in the present invention; the system includes: SLD broadband light source 1, the light source is connected to the polarization-maintaining optical fiber 4 to be measured through the optical fiber polarizer 2 and the connecting flange 3 in turn, and the polarization-maintaining optical fiber The other end is connected to the fiber optic spectrometer 11 after passing through a compensating interferometer. Compensation interferometer among the present invention adopts Michelson interferometer, as figure 2 As shown, 5 is a half-wave plate, 6 is an analyzer, 7 is a half mirror, 8 is a stationary mirror, 9 is a scanning mirror, 10 is a stepper motor that controls the rotation of a half-wave plate, and 12 is a The stepper motor that controls the mo...
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Provided is a method for measuring birefringence dispersion values of polarization-maintaining fibers on basis of white light frequency domain interference and cubic phase function. The method is suitable for high-precision measurement of the birefringence dispersion values of the polarization-maintaining fibers within the scope of a full spectrum. The method is based on a Michelson white light frequency domain interference measuring system, frequency domain interference signals are collected through a spectrograph, a data processing method based on the cubic phase function is adopted, group delay dispersion values are extracted from a ridge line of the cubic phase function, and the birefringence dispersion values are further calculated. According to the method, measurement precision of the birefringence dispersion values of the polarization-maintaining fibers can be improved, a phase extraction process and differential operations are avoided in the data processing method, parameter selection is not needed, and influences of disturbance of experimental environment on measuring results are reduced. A frequency spectrum interferometry is adopted, measuring time is short, the signal-to-noise ratio of signals is high, and full spectral information can be obtained.
Description
technical field [0001] The invention relates to a method for measuring birefringence dispersion of a polarization-maintaining optical fiber by white light frequency-domain interferometry, in particular to a data processing method for a frequency-domain interference signal based on a cubic phase function, and belongs to the technical field of optical measurement. Background technique [0002] As a special fiber that can maintain the polarization state of the transmitted light, the polarization-maintaining fiber can generate inherent birefringence in the fiber by introducing inherent internal stress inside the fiber or changing the geometry of the fiber, thereby eliminating the influence of perturbative birefringence on the polarization state of the transmitted light. Realize polarization maintaining transmission. Polarization-maintaining fibers are widely used in coherent optical fiber communication systems, fiber optic gyroscopes, optical passive devices, and polarization-se...
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IPC IPC(8): G01M11/02G01J3/45G06F19/00
Inventor 张红霞曾崇翔贾大功刘铁根张以谟
Owner TIANJIN UNIV