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

We present an integrated hybrid semiconductor-dielectric (InP-Si N ) 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 ci...

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Published inOptics express Vol. 27; no. 9; pp. 13307 - 13318
Main Authors Mak, Jesse, van Rees, Albert, Fan, Youwen, Klein, Edwin J, Geskus, Dimitri, van der Slot, Peter J M, Boller, Klaus-J
Format Journal Article
LanguageEnglish
Published United States 29.04.2019
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Summary:We present an integrated hybrid semiconductor-dielectric (InP-Si N ) 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.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.27.013307