Polarization principal axis alignment system and method for squeezing polarization maintaining optical fiber

Abstract

The invention discloses a polarization principal axis alignment system and method for squeezing a polarization maintaining optical fiber. The polarization principal axis alignment system comprises a light source part, a polarization principal axis alignment device and a polarization analyzer. The light source part is used for generating a specific polarization state. The polarization principal axis alignment device is used for enabling squeezing force to be aligned with a polarization principal axis of the squeezed polarization maintaining optical fiber and comprises a bottom plate, a connector mounting seat, a rotating center-aligning mechanism, a fine-tuning frame, an optical fiber clamping rod and an optical fiber tail end fixing frame. The method for polarization principal axis alignment by squeezing the polarization maintaining optical fiber comprises the steps that one end of the to-be-squeezed polarization maintaining optical fiber provided with a connector is fixed to the connector mounting seat, and then the to-be-squeezed polarization maintaining optical fiber penetrates through the rotating center-aligning mechanism, and is embedded into the optical fiber clamping rod, loaded into the fine-tuning frame along with the clamping rod, and finally fixed to the tail end fixing frame; the optical fiber is straightened, penetrates through the center-aligning mechanism without any torsion, is embedded into the optical fiber clamping rod and put into the fine-tuning frame, and is on the same straight line with the optical axis of the device; and through the rotating center-aligning mechanism and adjusting of pressure, the direction of the polarization principal axis is found out when the circle on a Poincare sphere is shrunk to a point, and thus axis alignment is achieved.

Description

technical field [0001] The invention belongs to the field of optical fiber communication and optical fiber sensing, and relates to a polarization main axis alignment system and method for extruding a polarization-maintaining optical fiber. Background technique [0002] The wave plate is a polarizing optical device that changes the phase difference between the two polarization components of light, so that the superposition of light transmission becomes a new polarization state. Generally, the phase difference of the wave plate is not adjustable. When the phase difference is 2π or n times 2π, the polarization state will not change after the linearly polarized light enters, which is called a full wave plate; when the retardation is π or its odd multiple, the linear polarization After the polarized light enters, the outgoing vibration direction will rotate at an angle twice the angle with the fast axis, which is called a half-wave plate; when the retardation is π / 2 or its odd mu...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problem that the polarization main axis of the polarization maintaining fiber is difficult to find, and to eliminate the influence of other stresses in the process of assembling the extruder, the present invention discloses a polarization main axis alignment system and method for extruding a polarization maintaining fiber

Images