Parity-time-symmetric coupled microring lasers operating around an exceptional point

TL;DR

This paper investigates PT-symmetric coupled microring lasers near an exceptional point, demonstrating stable single-mode lasing through abrupt phase transitions in multi-mode arrangements.

Contribution

It introduces a novel approach to achieve stable single-mode lasing in multi-mode microring systems using PT symmetry near an exceptional point.

Findings

Stable single-mode lasing achieved near the exceptional point

Abrupt phase transition enables mode control

Enhanced understanding of PT symmetry in microring lasers

Abstract

The behavior of a parity-time (PT) symmetric coupled microring system is studied when operating in the vicinity of an exceptional point. Using the abrupt phase transition around this point, stable single-mode lasing is demonstrated in spectrally multi-moded micro-ring arrangements.