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Optics | Physical Sciences and Mathematics | Physics
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).
S. Butler, A. Bakoz, P. Singaravelu, A. Liles, B. O’Shaughnessy, E. Viktorov, L. O’Faolain, and S. Hegarty, "Frequency modulated hybrid photonic crystal laser by thermal tuning," Opt. Express 27, 11312-11322 (2019). Available at https://doi.org/10.1364/OE.27.011312