A novel approach to interface high-Q Fabry–Pérot resonators with photonic circuits
Abstract
The unique benefits of Fabry–Pérot resonators as frequency-stable reference cavities and as an efficient interface between atoms and photons make them an indispensable resource for emerging photonic technologies. To bring these performance benefits to next-generation communications, computation, and time-keeping systems, it will be necessary to develop strategies to integrate compact Fabry–Pérot resonators with photonic integrated circuits. In this paper, we demonstrate a novel reflection cancellation circuit that utilizes a numerically optimized multi-port polarization-splitting grating coupler to efficiently interface high-finesse Fabry–Pérot resonators with a silicon photonic circuit. This circuit interface produces a spatial separation of the incident and reflected waves, as required for on-chip Pound–Drever–Hall frequency locking, while also suppressing unwanted back reflections from the Fabry–Pérot resonator. Using inverse design principles, we design and fabricate a polarization-splitting grating coupler that achieves 55% coupling efficiency. This design realizes an insertion loss of 5.8 dB for the circuit interface and more than 9 dB of back reflection suppression, and we demonstrate the versatility of this system by using it to interface several reflective off-chip devices.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 01, 2023
- Source ID
- 10.1063/5.0174384
Entities
People
- Chao Xiang
- Franklyn Quinlan
- Haotian Cheng
- Joel Guo
- John E. Bowers
- Naijun Jin
- Owen Miller
- Peter T Rakich
- Scott A. Diddams
- Yishu Zhou
- Zhaowei Dai
Organizations
- Defense Advanced Research Projects Agency
- National Institute of Standards and Technology
- National Science Foundation
- United States Department of Energy
- University of Colorado
- University of Colorado Boulder
- Yale University