Polarization-maintaining fiber coupler, preparation method thereof and all-fiber optical current sensor

Abstract

The invention discloses a polarization-maintaining fiber coupler. A coupling region of the polarization-maintaining fiber coupler is made of single-mode optical fibers, an input end of the polarization-maintaining fiber coupler at least contains a polarization-maintaining optical fiber, an output end which is directly communicated with the input end is one single-mode optical fiber, the input end of the polarization-maintaining fiber coupler at least contains one single-mode optical fiber, an output end which is directly communicated with the input end is the polarization-maintaining optical fiber, and the polarization-maintaining optical fibers of the input end and the output end are fused with the corresponding single-mode optical fibers in the coupling region respectively. A method for preparing the polarization-maintaining fiber coupler comprises the following steps that: firstly, a heat sealer is used to prepare two-node optical fibers; secondly, the optical fibers are arranged and axially positioned according to the design requirement; and finally, a plurality of the single-mode optical fibers in the middle are fused and drawn into the coupling region. In the polarization-maintaining fiber coupler, the coupling region is formed by drawing the single-mode optical fibers, so a device has the characteristics of no sensitivity to the polarization and temperature environment, and the stability and the reliability of the device are greatly improved. The invention also discloses an all-fiber optical current sensor.

Description

technical field [0001] The invention relates to a polarization maintaining optical fiber coupler and a preparation method thereof. The invention also relates to an all-fiber current sensor using the polarization-maintaining fiber coupler. Background technique [0002] Polarization-maintaining fiber couplers are widely used in various fields, especially in polarization-maintaining sensors. At present, most of the polarization-maintaining fibers are stress-type polarization-maintaining fibers. The main characteristics of the polarization-maintaining coupler made of this type of fiber are particularly sensitive to temperature. limits. Here we take 3×3 polarization-maintaining fiber coupling as an example (see figure 1 ), this device is made by using three polarization-maintaining optical fibers to be placed and positioned in a straight line, and then ensure that the optical fibers are parallel and close together, and then fused and tapered. Due to the difficulty of manufact...

AI Technical Summary

Problems solved by technology

The all-fiber current sensor using the traditional 3×3 polarization-maintaining fiber coupler also makes the main performance of the device unreliable due to the shortcomings of the traditional polarization-maintaining fiber coupler

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