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Frequency modulated hybrid photonic crystal laser by thermal tuning

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Author(s)

S. M. Butler, A. P. Bakoz, P. K.J. Singaravelu, A. A. Liles, B. O’Shaughnessy, E. A. Viktorov, L. O’Faolain, S. P. Hegarty

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Abstract

We demonstrate frequency modulation (FM) in an external cavity (EC) III-V/silicon laser, comprising a reflective semiconductor optical amplifier (RSOA) and a silicon nitride (SiN) waveguide vertically coupled to a 2D silicon photonic crystal (PhC) cavity. The PhC cavity acts as a tunable narrowband reflector giving wavelength selectivity. The FM was achieved by thermo-optical modulation of the reflector via a p-n junction. Single-mode operation was ensured by the short cavity length, overlapping only one longitudinal laser mode with the reflector. We investigate the effect of reflector modulation theoretically and experimentally and predict a substantial tracking of the resonator by the laser frequency with very small intensity modulation (IM).

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Original languageEnglish
Pages (from-to)11312-11322
Number of pages11
JournalOptics Express
Volume27
Issue number8
Early online date9 Apr 2019
DOIs
Publication statusPublished - 15 Apr 2019

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