Optical microring resonator has been the promising device in nano-communication for a high-speed, large-scale platform. A microring add-drop filter consists of one input port, one microring resonator, and two out ports. The microring resonator serves as a selector for optical carriers and wavelengths. The selected optical wavelength can be routed to one output port and the rest of the wavelengths are transmitted to the other output port. These three-port devices function as switches to route optical signals to different output ports, allowing further integration of various devices on the same platform.

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