Highly Stabilized Integrated Frequency Comb Quantum-Dash Laser Via Voltage-Controlled Temperature Feedback Loop

Semiconductor quantum dash (Qdash)-based lasers have gained significant interest for their ability to generate optical frequency combs, making them attractive for applications such as precision spectroscopy, frequency metrology, optical clocks, LiDAR, or communications. Some of these applications require a highly stabilized comb with frequency spacing on the order of tens of GHz or higher. Various long-term stabilization schemes have been proposed using electrical or ultra-short optical feedback [1]. Resonant optical feedback has allowed passive stabilization of Qdash lasers emitting at 1550 nm [2], though the variation in the spectral comb line separation is still limited to 50 kHz. In this work, we propose an alternative stabilization approach based on voltage-controlled temperature feedback loop, which drastically reduces the frequency drift.