Open AccessEnhanced modulation characteristics in broken symmetric coupled microring lasers
Author(s) -
Chi Xu,
William E. Hayenga,
Hossein Hodaei,
Demetrios N. Christodoulides,
Mercedeh Khajavikhan,
Patrick LiKamWa
Publication year - 2020
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.394830
Subject(s) - optics , laser , physics , semiconductor laser theory , modulation (music) , quantum dot laser , symmetry (geometry) , geometry , mathematics , acoustics
The dynamical behavior of broken symmetric coupled cavity lasers is theoretically investigated. The frequency response of this class of lasers is obtained using small signal analysis under direct modulation. Our model predicts a modulation bandwidth enhancement as a broken symmetric laser, operating in the parity-time (PT) symmetry and non-PT symmetry domains. This theoretical prediction is numerically examined in a laser system based on an InGaAs quantum dot platform. Our results clearly show that in these structures, in addition to the injection current, the gain-loss contrast can be used as a new degree of freedom in order to control the characteristic poles of the frequency response function.