Described herein are optical switches that enable high-speed, low-loss, and low-crosstalk switching across multiple wavelengths within a CMOS-compatible platform. The optical switches described herein use resonant devices (e.g., microring resonators) controlled via carrier-induced phase modulation effects. To allow for multi-wavelength operation, the inventor proposes matching the free spectral range (FSR) of a resonant device to the spacing between adjacent WDM channels. By matching the FSR of a resonant device to the spacing between adjacent WDM channels, all the WDM channels can be switch simultaneously, thereby increasing the system's ability to perform parallel, high-speed switching. Resonant devices of the types described herein may be implemented in various ways. In one example, a device may be configured as a microring resonator, a closed-loop waveguide positioned adjacent to a bus waveguide, where light can couple into and out of the microring through evanescent coupling.

Various embodiments disclosed herein describe optomechanical phase shifters. The optomechanical phase shifters may be configured with an asymmetry that improves the performance of the OM phase shifter as a function of wavelength. In some instances, the optomechanical phase shifter includes a section of a waveguide having an asymmetric cross-sectional shape. In other instances an optomechanical phase shifter is incorporated into a controllable optical switch, such that OM phase shifters may be actuated to selectively route light to different outputs of the controllable optical switch.