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arXiv · 1308.1850

Multi-stabilities and symmetry-broken one-colour and two-colour states in closely coupled single-mode lasers

Eoin Clerkin·Stephen O'Brien·Andreas Amann
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Abstract

We theoretically investigate the dynamics of two mutually coupled identical single-mode semi-conductor lasers. For small separation and large coupling between the lasers, symmetry-broken one-colour states are shown to be stable. In this case the light output of the lasers have significantly different intensities while at the same time the lasers are locked to a single common frequency. For intermediate coupling we observe stable symmetry-broken two-colour states, where both lasers lase simultaneously at two optical frequencies which are separated by up to 150~GHz. Using a five dimensional model we identify the bifurcation structure which is responsible for the appearance of symmetric and symmetry-broken one-colour and two-colour states. Several of these states give rise to multi-stabilities and therefore allow for the design of all-optical memory elements on the basis of two coupled single-mode lasers. The switching performance of selected designs of optical memory elements is studied numerically.

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Eoin Clerkin, Stephen O'Brien, Andreas Amann. 2014-02-22. Multi-stabilities and symmetry-broken one-colour and two-colour states in closely coupled single-mode lasers. https://doi.org/10.1103/physreve.89.032919

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