Optimal interfacing with coupled-cavities slow-light waveguides: Mimicking periodic structures with a compact device

Jacob Scheuer*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We present a design for optimal interfacing (I/O coupling) with slow-light structures consisting of coupled cavities. The I/O couplers are based on adding a small set of cavities with varying coupling coefficients at edges of the coupled cavities waveguide in order to match its impedance with that of the I/O waveguides. I/O efficiencies exceeding 99.9% are shown to be possible over a bandwidth which is larger than 50% of that of the coupled cavities waveguide. Consequently, the reflections at the edges of the slow-light structure are practically eliminated. We discuss the properties of the perfectly impedance matched slow-light structure as an effective (super-structure) cavity and study the impact of the number of cavities comprising the I/O coupler. We also consider in details the impact of errors and disorder in the I/O coupling sections.

Original languageEnglish
Pages (from-to)16260-16273
Number of pages14
JournalOptics Express
Volume25
Issue number14
DOIs
StatePublished - 10 Jul 2017

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