Tunable microwave-photonic filtering with high out-of-band rejection in silicon
Abstract
The ever-increasing demand for high speed and large bandwidth has made photonic systems a leading candidate for the next generation of telecommunication and radar technologies. The photonic platform enables high performance while maintaining a small footprint and provides a natural interface with fiber optics for signal transmission. However, producing sharp, narrow-band filters that are competitive with RF components has remained challenging. In this paper, we demonstrate all-silicon RF-photonic multi-pole filters with ∼100× higher spectral resolution than previously possible in silicon photonics. This enhanced performance is achieved utilizing engineered Brillouin interactions to access long-lived phonons, greatly extending the available coherence times in silicon. This Brillouin-based optomechanical system enables ultra-narrow (3.5 MHz) multi-pole response that can be tuned over a wide (∼10 GHz) spectral band. We accomplish this in an all-silicon optomechanical waveguide system, using CMOS-compatible fabrication techniques. In addition to bringing greatly enhanced performance to silicon photonics, we demonstrate reliability and robustness, necessary to transition silicon-based optomechanical technologies from the scientific bench-top to high-impact field-deployable technologies.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 01, 2020
- Source ID
- 10.1063/5.0015174
Entities
People
- Eric A Kittlaus
- Nils T Otterstrom
- Peter T Rakich
- Shai Gertler
Organizations
- California Institute of Technology
- David and Lucile Packard Foundation
- National Science Foundation
- Office of Naval Research
- Yale University