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We design and fabricate a simple ultracompact wavelength-controllable bi-directional optical diode. It consists of a silicon microring (nonlinear attenuator) and a directional coupler (linear attenuator). High nonreciprocal transmission (∼24.2dB) is achieved. Negligible-penalty OFDM/OAM 64-QAM signaling through the diode is demonstrated.
We design and fabricate on-chip two/three mode (de)multiplexer using a tapered asymmetrical directional coupler. System experiments of OFDM 64/128/256-QAM data transmission have been carried out for on-chip two/three mode (de)multiplexing applications.
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