Abstract
We extend the control range of the factor of a ring cavity that consists of a photonic crystal. The control range, which determines the storage time (high ) and efficiency of input and output (low ) of light, is required to be wide for the random-access memory of an optical pulse train. The conventional photonic-crystal ring cavity with a directional coupler and a hexagonal-shape ring waveguide has a very narrow range. We replace these components by a directional coupler having flat dispersion and a circularly curved ring waveguide. We experimentally varied the factor by thermal modulation of the device and achieved a control range between and .
©2012 Optical Society of America
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