Simultaneous polarization attraction and Raman amplification of a light beam in optical fibers

TL;DR

This paper demonstrates a method to simultaneously achieve polarization attraction and Raman amplification of a light beam in optical fibers using a counterpropagating scheme, enhancing signal quality and strength.

Contribution

It introduces a novel combined approach for polarization control and amplification in optical fibers using counterpropagating pump waves.

Findings

Complete repolarization of the signal achieved

6.7 dB amplification of the signal

Successful demonstration at 1550 nm with 10 Gbit/s RZ signal

Abstract

In this paper, we demonstrate that it is possible to combine both Raman amplification and polarization attraction of a signal wave in a single optical fiber by means of a counterpropagating scheme. Experiments were performed near 1550 nm in a continuous wave regime and by means of a 10 Gbit / s return-to-zero signal injected in a 20 kmlong low polarization mode dispersion optical fiber. Complete repolarization and 6.7 dB amplification of the signal wave was achieved by injecting a 850 mW, 1480 nm counterpropagating polarized pump wave.