Dispersion-shifted fiber polarization scrambler based on Faraday effect

Abstract

Abstract-Demonstration of an all-fiber polarization scrambler based on the Faraday effect is carried out. The device has been constructed using dispersion-shifted fiber that has a major tolerance to bends than standard single-mode fiber. Results about the fiber Verdet constant when 1550-nm light is launched are presented. The performance of the constructed device is also shown. Main features are insertion losses as low as 0.4 dB and scrambling frequency up to 20 kHz. Although here we emphasize its application to low-frequency heterodyne detection, the scrambler is applicable to other systems that are polarization dependent. In particular, it would be useful to overcome problems originated by polarization dependent gain in erbium-doped fiber amplified systems.Index Terms-Optical fiber devices, optical fiber measurements, optical fiber polarization.

3405151.pdf

“…where V ∼ 0.53 rad/(Tm) is the Verdet constant of single mode optical fibers at telecom wavelength [7]. The magnitudes of these effects depend on the geometry and structure of the cable and would require knowledge of the electric and magnetic field distribution in HV-AC cables.…”

A measurement technique of the tiny rotatory angle

“…It is used in a number of applications such as analysis of the fiber core absorption, mixture of hydrocarbons, magnetic moments of in complete shell of magnetic atoms, and so on 3,4 . In fact, most of materials showing Faraday effect have small rotations when the applied magnetic fields is mediate make it difficult to measure.…”