Method of pre-estimating position-amplitude meaning of interference peak in polarization maintaining optical fiber defect point detection

Abstract

The invention belongs to the optical fiber measuring field, to be specific, relates to a method of pre-estimating position-amplitude meaning of an interference peak in polarization maintaining optical fiber defect point detection. A number and corresponding positions of all of defect points of a to-be-measured polarization maintaining optical fiber are determined, and the number of the defect points is recorded; the initial valuation of the coupling intensities of the various defect points is carried out; when the to-be-measured polarization maintaining optical fiber is measured, lengths of interval optical fibers divided by the defect points are measured; the linear birefringence of every interval optical fiber of the to-be-measured polarization maintaining optical fiber is set; the countershaft angle of the to-be-measured polarization maintaining optical fiber connected with a measuring system is determined; the number of the defect points, the coupling intensities of the defect points, the lengths of the interval optical fibers, and the countershaft angle are input in an analyzing system for analysis. The position-intensity general expression of the interference peak is deduced. By giving the scanning optical path of the position, a required formula is directly selected to acquire the amplitude meaning of the interference peak, and a calculation process is simplified, and calculation time is saved.

Description

technical field [0001] The design of the invention belongs to the field of optical fiber measurement, and in particular relates to a method for predicting the position-amplitude meaning of interference peaks in the detection of polarization-maintaining optical fiber defect points. Background technique [0002] Polarization-maintaining fiber is an important device in integrated optical devices and fiber-optic interferometers, and it is also an important carrier of distributed fiber-optic sensing. Due to the high linear birefringence of PM fiber, it can provide two relatively independent orthogonal polarization transmission axes—fast axis and slow axis. In general, the polarization states of the transmitted light in both axes are well preserved. Due to the defects in the internal structure of the polarization-maintaining fiber or external disturbances, the optical energy coupling that can still occur between the two orthogonal polarization modes of the polarization-maintainin...

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Problems solved by technology

If the high-order interference peak problem is considered, the complexity of the calculation will be greatly increased

So far, no patent has mentioned the theoretical estimation of all orders of characteristic interference peaks for polarization-maintaining fibers with multiple defects

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