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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...
This paper proposes a novel manipulated rotating polarization switched quadrature phase shift keying (MR-PS-QPSK) technique, and correlated constant modulus algorithm (CMA). The latter utilizes the correlation between PS-QPSK symbols in X/Y polarizations to lock the phase of outputted X/Y signals. Then the X/Y signals are merged according to recovered switching bit, which suppresses the noise and...
This paper proposes a manipulated rotating binary phase shift keying (MR-BPSK) technique, which can use conventional constant modulus algorithm (CMA) to update the adaptive filter coefficient. This technique inherits the robust nonlinear tolerance of conventional BPSK, which is proved in 420/440km real time unrepeatered transmission experiment.
A 2.5Gb/s/λ bi-directional coherent UDWDM-PON is demonstrated with 4-ASK modulation using heterodyne detection. The frequency offset tolerance is around 6 GHz within 0.5-dB penalty, and no EDFA is needed in either ONU or OLT.
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.
We design and fabricate silicon vertical slot waveguides. Ultra-wide bandwidth 1.8-Tbit/s (161 WDM 11.2-Gbit/s OFDM 16-QAM) data transmission through 1-mm, 2mm, 3.1-mm, 12.2-mm-long silicon vertical slot waveguides are demonstrated in the experiment. All 161 WDM channels achieve BER less than 1e-3 after propagating through silicon vertical slot waveguides.
We report the generation and detection of a 44-Gb/s coherent-optical OFDM signal with trellis-coded 32-QAM modulation, showing receiver sensitivity improvements over uncoded 16-QAM of 3.4 and 5.0 dB at BER of 10-3 and 10-4, respectively.
We experimentally demonstrate the intra-symbol frequency-domain averaging based channel estimation for a 40-Gb/s polarization-division-multiplexed coherent optical OFDM signal with 8-QAM modulation under large polarization-mode-dispersion, showing improved efficiency as compared to the time-domain averaging based scheme.
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