Optimizing performance for an on-chip stimulated Brillouin scattering-based isolator
- Publisher:
- Optica Publishing Group
- Publication Type:
- Journal Article
- Citation:
- Journal of the Optical Society of America B: Optical Physics, 2023, 40, (3), pp. 523-534
- Issue Date:
- 2023-03-01
Open Access
Copyright Clearance Process
- Recently Added
- In Progress
- Open Access
This item is open access.
Non-reciprocal optical components such as isolators and circulators are crucial for preventing catastrophic backreflection and controlling optical cross talk in photonic systems. While non-reciprocal devices based on Brillouin intermodal transitions have been experimentally demonstrated in chip-scale platforms, harnessing such interactions has required a suspended waveguide structure, which is challenging to fabricate and is potentially less robust than a non-suspended structure, thereby limiting the design flexibility. In this paper,we numerically investigate the performance of a Brillouin-based isolation scheme in which a dual-pump-driven optoacoustic interaction is used to excite confined acoustic waves in a traditional ridge waveguide.We find that acoustic confinement, and therefore the amount of Brillouin-driven mode conversion, can be enhanced by selecting an appropriate optical mode pair and waveguide geometry of two arsenic-based chalcogenide platforms. Further, we optimize the isolator design in its entirety, including the input couplers, mode filters, the Brillouin-active waveguide as well as the device fabrication tolerances.We predict such a device can achieve 30 dB isolation over a 38 nm bandwidth when 500mWpump power is used; in the presence of a _10 nm fabrication-induced width error, such isolation can be maintained over a 5-10nmbandwidth.
Please use this identifier to cite or link to this item: