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We have experimentally demonstrated the signal-to-signal beating interference (SSBI) mitigation capability of Kramers–Kronig (KK) detection in a single sideband (SSB) four-ary pulse-amplitude-modulation (PAM4) direct detection (DD) system. A 112-Gbit/s (56-GBaud) SSB-PAM4 optical signal suitable for KK detection is generated by using a single commercial, low-cost dual-drive Mach–Zehnder modulator...
A 1×9 multiport spectrum cutter based on liquid crystal on silicon (LCoS) is proposed, fabricated, and demonstrated. As an LCoS-based optical processor, the spectrum cutter can realize fine control of filter attenuation (0∼30dB range) and phase (0∼2π) characteristics with minimum bandwidth of 15 GHz and maximum bandwidth of 5 THz across the C-band. The optical transfer function can be software-specified...
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.
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