Fast and Chaotic Fiber-Based Nonlinear Polarization Scrambler

TL;DR

This paper introduces a novel all-optical fiber-based polarization scrambler that uses nonlinear interactions to achieve rapid, chaotic polarization scrambling, confirmed by experiments and analytical models, suitable for high-speed telecom signals.

Contribution

The paper presents a simple, efficient nonlinear fiber-based polarization scrambler capable of high-speed chaotic scrambling, with experimental validation and potential for enhanced performance through cascaded configurations.

Findings

Achieves polarization scrambling speeds up to 250 krad/s.

Successfully tested on 10-Gbit/s telecom signals.

Analytical estimations match experimental results.

Abstract

We report a simple and efficient all-optical polarization scrambler based on the nonlinear interaction in an optical fiber between a signal beam and its backward replica which is generated and amplified by a reflective loop. When the amplification factor exceeds a certain threshold, the system exhibits a chaotic regime in which the evolution of the output polarization state of the signal becomes temporally chaotic and scrambled all over the surface of the Poincar\'e sphere. We derive some analytical estimations for the scrambling performances of our device which are well confirmed by the experimental results. The polarization scrambler has been successfully tested on a single channel 10-Gbit/s On/Off Keying Telecom signal, reaching scrambling speeds up to 250-krad/s, as well as in a wavelength division multiplexing configuration. A different configuration based on a sequent cascade of polarization scramblers is also discussed numerically, which leads to an increase of the scrambling performances.