Simplified schematics of the isolator device. Undoped, lightly p-doped, lightly n-doped, heavily p-doped, and heavily n-doped silicon, as well as vias and electrical wirings are identified.
Optical microscope image of the device, which consists of an 80 ?m radius ring resonator coupled to an MZI. The ring has a p-i-n diode integrated around it. Waveguide cross sections at various parts of the device are shown.
SEM image of the microring modulator used in the feedback control to thermally stabilize a microring resonator.
(a) Architecture of the WDM Optical Network Unit (ONU). (b) Configuration of the individual colorless ONU. (c) Transmission spectra of the AWG, microring demultiplexer (Demux), and the microring modulator (Si Mod), respectively.
Photograph of true time delay device consisting of 20 resonators with the contact probes on the periphery (input and output fibers at top and bottom).