A 10-kHz intrinsic linewidth coupled extended-cavity DBR laser monolithically integrated on an InP platform

Rakesh Ranjan Kumar*, Andreas Hänsel, Mónica Far Brusatori, Lars Nielsen, Luc Augustin, Nicolas Volet, Martijn Heck

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Abstract

We report a monolithically integrated coupled extended-cavity distributed Bragg reflector laser with, to our knowledge, the lowest reported intrinsic linewidth of ∼10 kHz, which is extracted from a corresponding frequency-noise level of ∼3200 Hz 2/Hz, realized on an InP generic foundry platform. Using the delayed self-heterodyne method, the experimentally measured linewidth was 45 kHz. The laser has an on-chip optical output power of 18 mW around 1550 nm at an injection current of 95 mA. The laser operates in a single-mode regime with a side-mode suppression ratio of 54 dB. Our monolithic approach paves the way toward further integration, such as integrated quantum key distribution transceivers.

Original languageEnglish
JournalOptics Letters
Volume47
Issue9
Pages (from-to)2346-2349
Number of pages4
ISSN0146-9592
DOIs
Publication statusPublished - May 2022

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