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 language | English |
---|---|
Publication status | Published - 25 Nov 2022 |
Event | 26th annual Symposium of the IEEE Photonics Benelux Chapter 2022 - Eindhoven University of Technology, Eindhoven, Netherlands Duration: 24 Nov 2022 → 25 Nov 2022 Conference number: 26 https://www.aanmelder.nl/ieee-ps-benelux-2022 |
Conference
Conference | 26th annual Symposium of the IEEE Photonics Benelux Chapter 2022 |
---|---|
Country/Territory | Netherlands |
City | Eindhoven |
Period | 24/11/22 → 25/11/22 |
Internet address |
Keywords
- semiconductor laser
- mode-locking
- hybrid-integrated diode laser
- frequency comb