“…So far, many integrated optical devices including light couplers, splitters, modulators, and ring resonators have been proposed and fabricated using the SOI material system [1]- [4]. Among them, ring resonators are distinguished with their high wavelength selectivity, a key issue for many device applications ranging from wavelength multiplexers [5] to modulators [6]. Recently, high-resonator-based modulators with significantly lower switching powers have become an important alternative to Mach-Zehnder (MZ) modulators.…”