Abstract
We present a new approach to long range coupling based on a combination of adiabatic passage and lateral leakage in thin shallow ridge waveguides on a silicon photonic platform. The approach enables transport of light between two isolated waveguides through a mode of the silicon slab that acts as an optical bus. Due to the nature of the adiabatic protocol, the bus mode has minimal population and the transport is highly robust. We prove the concept and examine the robustness of this approach using rigorous modelling. We further demonstrate the utility of the approach by coupling power between two waveguides whilst bypassing an intermediate waveguide. This concept could form the basis of a new interconnect technology for silicon integrated photonic chips.
Highlights
Mass manufacture of monolithic systems of extraordinary complexity, compactness and precision using CMOS processing has underpinned the information revolution
We show this functionality by demonstrating that Coherent Tunnelling Adiabatic Passage (CTAP) using lateral leakage can bypass an intermediate waveguide
We have described a new concept for adiabatic transfer of power between two thin shallow ridge waveguides and proved this concept using rigorous numerical simulation
Summary
Mass manufacture of monolithic systems of extraordinary complexity, compactness and precision using CMOS processing has underpinned the information revolution. Long range communications between waveguides through unguided radiation in the silicon slab have been proposed as an alternate interconnect solution [7] This particular approach uses thin, shallow ridge silicon on insulator waveguides which, when operated in the TM mode, can radiate into the TE modes of the slab [8, 9]. CTAP has the surprising feature that the population in the intervening site is greatly suppressed, and in the adiabatic, tight-binding limit, is identically zero This unusual behaviour raises the question of whether CTAP may be exploited to achieve robust long range coupling between waveguides via unbound radiation, but without exciting this radiation.
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