Germanium-on-silicon waveguides for long-wave integrated photonics: ring resonance and thermo-optics
Abstract
Germanium-on-silicon (GOS) represents the leading platform for foundry-based long-wave infrared photonic integrated circuits (LWIR PICs), due to its CMOS compatibility and absence of oxides. We describe ring resonance (Q-factors between 2×103 and 1×104) and thermo-optic tunability in germanium-on-silicon waveguides throughout the long-wave-infrared. The ring resonances are characterized by Q-factors and couplings that agree with measurements of propagation loss (as low as 6 dB/cm) and simulations and are enabled by broadband edge coupling (12dB/facet over a 3 dB bandwidth of over 4 microns). We demonstrate the furthest into the infrared that ring resonators have been measured and show the potential of this platform for photonic integration and waveguide spectroscopy at wavelengths from 7 microns to beyond 11 microns.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 05, 2021
- Source ID
- 10.1364/oe.420687
Entities
People
- Dmitry A. Kozak
- Marcel W Pruessner
- Nathan F Tyndall
- Todd H Stievater
- William S. Rabinovich
Organizations
- Office of Naval Research
- United States Naval Research Laboratory