Integrated frequency comb laser with narrow intrinsic optical linewidth based on a dielectric waveguide feedback circuit

Abstract

We present an integrated hybrid semiconductor-dielectric (InP-Si${}_3$N${}_4$) waveguide laser that generates frequency combs at a wavelength around 1.5 $\mu$m 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.

References in corpus (5)

• Fully integrated ultra-low power Kerr comb generation
• Coherent terabit communications with microresonator Kerr frequency combs
• Sub-Hz line width diode lasers by stabilization to vibrationally and thermally compensated ULE Fabry-Perot cavities
• 25 kHz narrow spectral bandwidth of a wavelength tunable diode laser with a short waveguide-based external cavity
• Self-generation of optical frequency comb in single section Quantum Dot Fabry-Perot lasers: a theoretical study

Cited by in corpus (5)

• Hybrid integrated semiconductor lasers with silicon nitride feedback circuits
• Ring resonator enhanced mode-hop-free wavelength tuning of an integrated extended-cavity laser
• High-purity microwave generation using a dual-frequency hybrid integrated semiconductor-dielectric waveguide laser
• Self-pulsing dynamics in microscopic lasers with dispersive mirrors
• Integrated diode lasers for the generation of sub-GHz repetition rate frequency combs