Square wave excitability in quantum dot lasers under optical injection
Abstract
Quantum dot lasers display many unique dynamic phenomena when optically injected. Bistability has been predicted in a region of high injection strength. We show experimentally, rather than a phase-locked bistability, a square wave phenomenon is observed in this region. The squares can manifest as a periodic train but also as noise driven Type II excitable events. We interpret the appearance of the square waves as a thermally induced breaking of the bistability. Indeed we find experimentally that over the duration of a square the relative detuning between the master and the slave evolves deterministically. A relatively simple, physically motivated, rate equation model is presented and displays excellent agreement with the experiment.
Cite
@article{arxiv.1812.05036,
title = {Square wave excitability in quantum dot lasers under optical injection},
author = {Michael Dillane and Bogalsaw Tykalewicz and David Goulding and Bruno Garbin and Stephane Barland and Bryan Kelleher},
journal= {arXiv preprint arXiv:1812.05036},
year = {2019}
}
Comments
8 pages, 5 figures, preprint