Generation of optical frequency combs at sub-GHz repetition rates with a hybrid-integrated mode-locked diode laser

A. Memon*, A. van Rees, J. Mak, Y. Fan, P.J.M. van der Slot, H.M.J. Bastiaens, K.-J. Boller

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

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Abstract

Optical frequency combs based on broadband-gain bulk lasers offer low intrinsic linewidths and sub-GHz line-spacing. Nevertheless, susceptibility to mechanical and acoustic perturbations and the complexity of pumping of these lasers have motivated chip-integrated extended cavity diode lasers using low-loss and long Si3N4 feedback circuits to extend the laser cavity for low repetition rates. Typically, saturable absorbers are used for mode-locking, however, the short upper-state carrier lifetime in semiconductor optical amplifiers requires repetition rates of a GHz or higher. We demonstrate absorber-free generation of optical frequency combs in a hybrid integrated InP-Si3N4 mode-locked diode laser, using a low-loss Si3N4 feedback circuit that extends the on-chip optical roundtrip length up to 60 cm by three highly-selective ring resonators. This enables passive as well as hybrid mode-locking with a low repetition rate of around 484 MHz.
Original languageEnglish
Publication statusPublished - 25 Nov 2022
Event26th annual Symposium of the IEEE Photonics Benelux Chapter 2022 - Eindhoven University of Technology, Eindhoven, Netherlands
Duration: 24 Nov 202225 Nov 2022
Conference number: 26
https://www.aanmelder.nl/ieee-ps-benelux-2022

Conference

Conference26th annual Symposium of the IEEE Photonics Benelux Chapter 2022
Country/TerritoryNetherlands
CityEindhoven
Period24/11/2225/11/22
Internet address

Keywords

  • semiconductor laser
  • mode-locking
  • hybrid-integrated diode laser
  • frequency comb

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