Thermally stable hybrid cavity laser based on silicon nitride gratings

S. Iadanza, A. P. Bakoz, P. K. J. Singaravelu, D. Panettieri, S. A. Schulz, G. C. R. Devarapu, S. Guerber, C. Baudot, F. Boeuf, S. Hegarty, John William Whelan-Curtin

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


In this paper, we show the experimental results of a thermally stable Si3N4 external cavity (SiN EC) laser with high power output and the lowest SiN EC laser threshold to our knowledge. The device consists of a 250 μm sized reflective semiconductor optical amplifier butt-coupled to a passive chip based on a series of Si3N4 Bragg gratings acting as narrow reflectors. A threshold of 12 mA has been achieved, with a typical side-mode suppression ratio of 45 dB and measured power output higher than 3 mW. Furthermore, we achieved a mode-hop free-lasing regime in the range of 15–62 mA and wavelength thermal stability up to 80°C. This solves the challenges related to cavity resonances’ thermal shift and shows the possibility for this device to be integrated in dense wavelength-division multiplexing (WDM) and heat-intensive optical interconnects technologies.
Original languageEnglish
Pages (from-to)E218-E223
JournalApplied Optics
Issue number22
Early online date31 Jul 2018
Publication statusPublished - 1 Aug 2018


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