Demonstration of Large Coupling-Induced Phase Delay in Silicon Directional Cross-Couplers
article
We investigate directional couplers in silicon-on-insulator photonic technology. We theoretically and experimentally demonstrate a large coupling-induced phase delay that occurs when nearly all light is coupled from one waveguide to the other, i.e., when the coupler operates as a cross-coupler. We show that even a tiny asymmetry in the two waveguides of the coupler causes a significant additional phase delay. The observed change in the free-spectral-range of ring resonators from 5.0 nm to 6.4 nm is explained by a small 0.1% difference in the propagation constants of the two waveguides. Such a difference can be caused by for example a 1 nm difference in the widths of the two waveguides. © 1995-2012 IEEE.
Topics
Directional couplersintegrated opticsoptical devicesoptical filtersoptical waveguidessilicon-on-insulator technologyDirectional couplersIntegrated opticsOptical devicesOptical filtersOptical waveguidesSiliconWaveguide filtersWaveguidesFree spectral rangePhase delayPhotonic technologiesPropagation constantRing resonatorSilicon on insulator technology
TNO Identifier
954517
ISSN
1077260X
Source
IEEE Journal on Selected Topics in Quantum Electronics, 20(4)
Publisher
Institute of Electrical and Electronics Engineers Inc.
Article nr.
6675800
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