Ultralow-linewidth ring laser using hybrid integration and generic foundry platforms

Abstract

Two photonic integrated circuits (PICs) are coupled to form a hybridly integrated semiconductor ring laser in the telecom C band with an intrinsic linewidth of (158±21) Hz. This is, to the best of our knowledge, the first time an InP active–passive platform is used in conjunction with an integrated low-loss resonator to obtain a narrow-linewidth laser implemented using generic foundry platforms. The presented results pave the way for a hybrid integrated platform for microwave photonics (MWP), as the demonstrated device includes multiple active–passive components, and its narrow optical linewidth can potentially be translated to a narrow-linewidth microwave signal. Furthermore, as the laser is based on hybrid integration of two PICs from generic foundry platforms, there is a path to reproducible and low-cost devices.

Analysis of beam combining efficiency for filled-aperture

“…One notable breakthrough has been the implementation of novel laser cavity designs, 33 which have contributed to the reduction of linewidths while maintaining high output powers. Additionally, advances in active and passive stabilization techniques have played a critical role in mitigating noise-induced linewidth broadening, 34 resulting in more stable and coherent laser sources. Furthermore, the emergence of new gain media and pumping schemes 35 has facilitated the generation of high-power, narrow-linewidth laser sources, enabling their application in a wide range of scientific and industrial settings.…”

Scalable Bandwidth and High-Precision Spectral Measurement by Frequency Chirped Comb

“…Integrated resonators with high quality (Q-) factors are highly desirable for a wide range of applications such as narrow linewidth lasers [1], broadband communications [2], ultra-selectivity filter and biosensing [3,4]. Accurate characterization of such high-Q components plays a fundamental role and has motivated research in optical spectral analysis techniques with finer precision.…”