Polarization maintaining optical fiber end surface axis alignment device and method

Abstract

The invention provides a polarization maintaining optical fiber end surface axis alignment device and method. The polarization maintaining optical fiber end surface axis alignment device comprises a microscope, a light source, a crossed objective table, an axis alignment control module, an axis direction control module and an executing mechanism, wherein the ocular view of the microscope is provided with a reference line; polarization-maintaining optical fiber with the end surface cut is clamped by a fixture of the axis alignment control module, and the end surface of a polarization-maintaining optical fiber to be axis-aligned is arranged under the objective of the microscope; the light source is used for lighting up the side cladding layer of the polarization-maintaining optical fiber sothat the stress area of the end surface of the polarization-maintaining optical fiber to be axis-aligned can be positioned inside the view of the objective of the microscope; the axis alignment control module and the crossed objective table are fixedly connected; the executing mechanism is used for adjusting the crossed objective table to drive the axis alignment control module to rotate so that the contour of the stress area of the end surface of the polarization-maintaining optical fiber is tangential to the reference line inside the ocular view of the microscope to achieve shaft alignment between the end surface of e polarization-maintaining optical fiber and the reference line; the axis direction control module is used for clamping the axis-aligned polarization-maintaining optical fiber through the clamping plates of the fixture to achieve axis direction between the end surface of the polarization-maintaining optical fiber and the reference line.

Description

technical field [0001] The invention relates to a polarization-maintaining optical fiber end-to-axis device and method, and belongs to the technical field of electronic optical fibers. Background technique [0002] Polarization-maintaining optical fiber is an important basic equipment for coherent optical communication and coherent optical fiber sensing system. By artificially creating birefringence in the fiber, the propagation constants of the two linear polarization fundamental modes in the polarization-maintaining fiber have a large difference to effectively suppress the random unstable inter-mode coupling during propagation, thereby achieving polarization-maintaining performance and high The transmission requirements of precision signals. In theory, the sensitivity of coherent detection method can be increased by nearly 20dB compared with direct amplitude detection; therefore, the coherent optical fiber sensor with polarization-maintaining optical fiber as the main body...

AI Technical Summary

Problems solved by technology

For this type of polarization-maintaining fiber, the imaging characteristics are not obvious, and it is difficult to detect the polarization axis directly through side-illuminated imaging observation, and the alignment process sometimes requires the use of matching fluid, which also limits the work efficiency and application range

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