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Optimizing performance for on-chip SBS-based isolator

Choon Kong LaiMoritz MerkleinAlvaro Casas Bedoya ...+4 Benjamin J. Eggleton
Dec 2022
摘要
Non-reciprocal optical components such as isolators and circulators arecrucial for preventing catastrophic back-reflection and controlling opticalcrosstalk in photonic systems. While non-reciprocal devices based on Brillouinintermodal transitions have been experimentally demonstrated in chip-scaleplatforms, harnessing such interactions has required a suspended waveguidestructure, which is challenging to fabricate and is potentially less robustthan a non-suspended structure, thereby limiting the design flexibility. Inthis paper, we numerically investigate the performance of a Brillouin-basedisolation scheme in which a dual-pump-driven optoacoustic interaction is usedto excite confined acoustic waves in a traditional ridge waveguide. We findthat acoustic confinement, and therefore the amount of Brillouin-driven modeconversion, can be enhanced by selecting an appropriate optical mode pair andwaveguide geometry of two arsenic based chalcogenide platforms. Further, weoptimize the isolator design in its entirety, including the input couplers,mode filters, the Brillouin-active waveguide as well as the device fabricationtolerances. We predict such a device can achieve 30 dB isolation over a 38 nmbandwidth when 500 mW pump power is used; in the presence of a +/- 10 nmfabrication-induced width error, such isolation can be maintained over a 5-10nm bandwidth.
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