Serially-connecting cascaded Mach-Zehnder interferometers and ring resonator arrays for wavelength (de)multiplexing CW-WDM channels

We employed a cascaded Mach-Zehnder interferometer for optical interleaving and an array of racetrack ring resonators for optical channelization. Their combination leads to a 100-GHz spaced wavelength (de)multiplexer for CW-WDM with an optical crosstalk as low as -24 dB.