Tunable polarization rotator and optical fiber bending birefringence eliminating method

Abstract

The invention discloses a tunable polarization rotator and an optical fiber bending birefringence eliminating method. The tunable polarization rotator comprises an optical fiber, a bracket, a first disc, a second disc and a third disc; the first disc is rotatably supported on the bracket, and can horizontally move on the bracket; the side wall of the first disc is provided with an axially-protruding optical fiber winding body; the optical fiber winding body includes a first fan-shaped body, a first semi-cylinder, a second semi-cylinder and a second fan-shaped body; the first fan-shaped body and the second fan-shaped body are symmetrically disposed with respect to the center of the first disc; the first semi-cylinder and the second semi-cylinder are symmetrically disposed with respect to the center of the first disc; the first fan-shaped body has a first curved surface of which the radius is R; the first semi-cylinder has a second curved surface of which the radius is R / 2; and the second semi-cylinder has a third curved surface of which the radius is R / 2. With the tunable polarization rotator and the optical fiber bending birefringence eliminating method of the invention adopted, the rotation control of polarized light at an arbitrary angle can be realized; and the polarization rotator is independent of wavelengths, so that the wavelength independence of the tunable polarizationrotator can be ensured.

Description

technical field [0001] The invention relates to a tunable polarization gyrator and an optical fiber bending birefringence elimination method. Background technique [0002] Currently, the control of polarized light plays a very important role in optical systems. Especially in the field of fiber optics. There are many ways to generate polarized light. The dichroism of the polarizer is used to convert natural light into polarized light; the principle of reflection and refraction is used to generate polarized light; the birefringence of crystals is used to generate polarized light. In fiber optics, birefringence occurs randomly in long fibers due to external disturbances and inherent optical imperfections. Therefore, it is very important to use a polarization gyrator to control the polarization phenomenon in the fiber. Traditional polarization gyrators, such as half-wave plates, Faraday gyrators, Fresnel prisms, and mirrors can rotate polarized light, but these traditional po...

AI Technical Summary

Problems solved by technology

This effect can be exploited for polarization rotation, but is still wavelength-dependent due to bend-induced birefringence in helically wound fibers

[0004] There is currently a fixed polarization gyrator on the market, which exhibits excellent gyration angle and linearity maintenance for linearly polarized light, but its wavelength-independent operation over the wavelength range is difficult in conventional devices with non-zero net birefringence. can not complete

Images