Abstract
We study spontaneous four-wave mixing and spontaneous Raman scattering (SpRS) in a CMOS microring cavity in the C-band and find that the latter contributes a significant fraction to the signal/idler photon flux. We expect operation in the O-band to be less affected by SpRS due to higher confinement of the O-band light in crystalline Si in this device.
| Original language | English (US) |
|---|---|
| Article number | FTu6B.2 |
| Journal | Optics InfoBase Conference Papers |
| State | Published - 2022 |
| Event | Frontiers in Optics, FiO 2022 - Rochester, United States Duration: Oct 17 2022 → Oct 20 2022 |
Funding
We define the mode confinement factor (Γ) to be the ratio of the propagating component of the Poynting vector within the c-Si core region to that in the entire waveguide cross-section. Simulating the Γ for a range of waveguide widths, as shown in Fig. 2(b) for a microring of radius 17.8 µm using a finite-difference numerical modesolver, we find that a mode propagating in the waveguide in the O-band would be more confined to the core as compared to the C-band, also leading to less of the mode being in the cladding where SpRS occurs. Since both gR and γ are expected to scale similarly with wavelength, we can expect lesser SpRS in this device while operating in the O-band versus the C-band for the same pair-generation rate. Quantum communications in the O-band is a rapidly developing field which also involves coexistence of O-band quantum signals with classical signals in the C-band in the same channel [8]. Thus O-band CMOS-based pair sources could be a potential candidate for applications in quantum networking. Acknowledgments: Work funded in part by NSF EQuIP grant 1842692, the Catalyst Foundation, and the ONR grant N000141410259. We thank Ayar Labs and GlobalFoundries for support in fabrication.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Mechanics of Materials