Hybrid integrated InP-Si3N4 diode laser with a 40-Hz intrinsic linewidth

Youwen Fan, Albert van Rees, Peter J. M. van der Slot*, Jesse Mak, Ruud M. Oldenbeuving, Marcel Hoekman, Dimitri Geskus, Chris G. H. Roeloffzen, Klaus-J. Boller

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

40 Citations (Scopus)
98 Downloads (Pure)


We demonstrate a hybrid integrated and widely tunable diode laser with an intrinsic linewidth as narrow as 40 Hz, achieved with a single roundtrip through a low-loss feedback circuit that extends the cavity length to 0.5 meter on a chip. Employing solely dielectrics for single-roundtrip, single-mode resolved feedback filtering enables linewidth narrowing with increasing laser power, without limitations through nonlinear loss. We achieve single-frequency oscillation with up to 23 mW fiber coupled output power, 70-nm wide spectral coverage in the 1.55 μm wavelength range with 3 mW output and obtain more than 60 dB side mode suppression. Such properties and options for further linewidth narrowing render the approach of high interest for direct integration in photonic circuits serving microwave photonics, coherent communications, sensing and metrology with highest resolution.
Original languageEnglish
Article number398906
Pages (from-to)21713-21728
Number of pages16
JournalOptics express
Issue number15
Publication statusPublished - 20 Jul 2020


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