Optical fiber polarizer based on highly birefringent single-mode fiber

Abstract

An in-line fiber polarizer is proposed and demonstrated. The attenuation of a single-mode fiber experiencing an axial periodic perturbation shows peaks at certain wavelengths, resulting from the power coupling between the guided mode and the cladding modes. When the fiber has significant linear birefringence, each of these peaks is split into two peaks. The fiber thus exhibits polarization-selective attenuation characteristics. An example of such a polarizer is demonstrated based on a highly birefringent fiber with a beat length of 1.3 mm. A 25-dB polarization extinction ratio is obtained, with an attenuation of 1.3 dB at an operating wavelength of 1177 nm.

Induced transient birefringence of a resonantly pumped molecular gas

“…In addition, controlled molecular birefringence may be useful for a variety of applications including optical filters in signal processings, 44 nonlinear optical switching with birefringence gratings, 45 and polarization control for communications. 46…”

Angular alignment of a polarization-maintaining optical fiber

“…These fibers are essential for interferometric applications, [1][2][3][4][5] where the polarization state of the light should be maintained and not be affected by external perturbations. To achieve this objective, either the slow or the fast birefringent axis of the fiber should be aligned to the polarization direction of the input beam with a great accuracy ͑better than 0.5 deg since Ref.…”