Dynamic Intermode Beat Frequency Control of an Optical Frequency Comb Single Section Quantum Dot Laser by Dual-Cavity Optical Self-Injection
- Resource Type
- Periodical
- Authors
- Stutz, S.; Auth, D.; Weber, C.; Drzewietzki, L.; Nikiforov, O.; Rosales, R.; Walther, T.; Lester, L.F.; Breuer, S.
- Source
- IEEE Photonics Journal IEEE Photonics J. Photonics Journal, IEEE. 11(5):1-8 Oct, 2019
- Subject
- Engineered Materials, Dielectrics and Plasmas
Photonics and Electrooptics
Quantum dot lasers
Cavity resonators
Optical attenuators
Laser mode locking
Open systems
Optical variables control
Optical frequency comb laser
quantum dot lasers
self mode-locking
intermode beat frequency
self-injection
stochastic modelling
time-domain modelling.
- Language
- ISSN
- 1943-0655
1943-0647
Dynamic frequency tuning of the 40.67 GHz intermode beat frequency of a 1255 nm emitting 1 mm long monolithic self mode-locked single section optical frequency comb InAs/InGaAs quantum dot laser across 70 MHz is experimentally demonstrated by fine-delay dual-cavity controlled all optical self-injection. Fiber-based macroscopic optical delay lengths are 9.4 m (round-trip time of 62.7 ns) and 16.5 m (round-trip time of 110.1 ns), the maximum studied microscopic delay tuning times are 40 ps and the optical self-injection strengths are below 0.02%. For selected delay times, the lowest intermode beat frequency line width amounts to 2 kHz indicating an improvement of carrier phase coherence by a factor of 700 as compared to the free-running laser. We validate these experimental results by a simple and universal stochastic time-domain model which is applied for the first time to model a self mode-locked quantum dot laser subject to optical self-injection. Modeling results are in good quantitative agreement.