Observation of parity-time symmetry in electrically pumped FP laser

TL;DR

This paper reports the experimental demonstration of an electrically pumped PT symmetric Fabry-Perot laser that achieves single mode operation through electrical control of gain and loss, advancing laser mode selection techniques.

Contribution

It introduces a novel electrically pumped PT symmetric FP laser that enables mode selection by manipulating gain and loss electrically.

Findings

Single mode lasing at 1574.6nm achieved

Sidemode suppression ratio of 20.81dB demonstrated

Electrical control enables PT symmetry in FP lasers

Abstract

Parity-time (PT) symmetry is a new method to get single mode operation in lasers, mostly, micro-ring lasers. In this study, we propose and experimentally demonstrate an electrically pumped PT symmetric Fabry-Perot (FP) laser which can work with a mode selection. The proposed laser could achieve the PT symmetric condition by an electrical manipulation of the interplay between gain and loss in two FP resonators. The single mode lasing is demonstrated at 1574.6nm with a 20.81dB sidemode suppression ratio.