Linewidth narrowing via low-loss dielectric waveguide feedback circuits in hybrid integrated frequency comb lasers

Jesse Mak*, Youwen Fan, Edwin J. Klein, Dimitri Geskus, Peter J.M. van der Slot, Klaus J. Boller, Albert van Rees

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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We present an integrated hybrid semiconductor-dielectric (InP-Si 3 N 4 ) waveguide laser that generates frequency combs at a wavelength around 1.5 µm with a record-low intrinsic optical linewidth of 34 kHz. This is achieved by extending the cavity photon lifetime using a low-loss dielectric waveguide circuit. In our experimental demonstration, the on-chip, effective optical path length of the laser cavity is extended to 6 cm. The resulting linewidth narrowing shows the high potential of on-chip, highly coherent frequency combs with direct electrical pumping, based on hybrid and heterogeneous integrated circuits making use of low-loss dielectric waveguides.

Original languageEnglish
Pages (from-to)13307-13318
Number of pages12
JournalOptics express
Issue number9
Publication statusPublished - 29 Apr 2019


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