Optimizing performance for an on-chip stimulated Brillouin scattering-based isolator

Choon Kong Lai*, Moritz Merklein, Alvaro Casas-Bedoya, Yang Liu, Stephen J. Madden, Christopher G. Poulton, Michael J. Steel, Benjamin J. Eggleton

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)523-534
    Number of pages12
    JournalJournal of the Optical Society of America B: Optical Physics
    Volume40
    Issue number3
    DOIs
    Publication statusPublished - Mar 2023

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