Silicon photonic devices based on complementary-metal-oxide-semiconductor(CMOS) compatible technologies have shown attractive performances on very-large-scale monolithic optoelectronic integration,high speed modulation and switching,and efficient off-chip optical coupling.This paper presents the recent progress on fast silicon optical modulation,wavelength-insensitive optical switching and efficient optical coupling techniques in our group.Several CMOS-compatible silicon optical couplers with different structures have been developed,showing the highest coupling efficiency of 65%.Broadband silicon-based optical switches with sub-nanosecond switching on-off time are experimentally realized.Silicon modulators with novel PN junctions are demonstrated with the speed up to 50 Gb s-1.
We propose a novel resonator containing an elliptical microring based on a silicon-on-insulator platform. Simu- lations using the three-dimensional finite-difference time-domain method show that the novel elliptical microring can efficiently enhance the mode coupling between straight bus waveguides and resonator waveguides or between adjacent resonators while preserving relatively high intrinsic quality factors with large free spectral range. The proposed resonator would be an alternative choice for future high-density integrated photonic circuits.
