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We present a high-speed flexible photonic-assisted Discrete Fourier Transform (DFT) processor based on a dual, phase-locked optical parametric combs. A 25-point DFT at 500 Million-DFT-point per second throughput is achieved relying on slow, 20 MS/s Analog to Digital Converter (ADC).
We demonstrate WDM transmission of seven 50 GHz-spaced 400 Gb/s (30 GBaud) DP-256-QAM channels over 52 km of SMF. Transmission relied on a frequency comb, generating kHz-linewidth, high OSNR carriers to demonstrate compatibility with metro and inter-data-center applications.
The effects of dispersion parameter mismatch and limited steps-per-span are investigated in a system employing Transmitter-Side Digital Back Propagation with Frequency Referenced Carriers.
We discuss necessary and sufficient conditions conducive to the reversal of nonlinear interaction in fiber optic transmission. While the complete information about complex amplitude and phase of the electric field certainly allows reversal of the nonlinear interaction, it is shown that knowledge about carriers' frequencies in WDM represents a sufficient condition for a successful compensation of the...
A 100% reach extension in a coherent Wavelength Division Multiplexing link is demonstrated relying on transmitter-side full-field Digital Back-Propagation and frequency referenced carriers. Transmission reach is extended from 1445 km to 2890 km for a 4-channel 16 GBaud 16-QAM system.
We study the limitations and their origins in the nonlinear effects mitigation in fiber-optic communication systems. The carrier frequencies uncertainty and their stochastic variations are identified as the major impeding factor for successful inter-channel nonlinear impairments management. Furthermore, the results clearly point out to the significant benefits of employing fully frequency referenced...
A 75 nm wide parametric frequency comb with 6.25 GHz frequency grid is used for 31.8 Tb/s coherent transmission of 1520 Nyquist UDWDM channels, offering up to 30 Gb/s per user over a 50 km of regular single mode fiber.
We present a novel scalable photonically-sampled analog-to-digital-converter based on parametric multicasting, polychromatic sampling and frequency referenced lasers. A sampling rate of 30-GS/s is achieved with three subrate-channels with a 6.2-ENOB performance of a 19-GHz signal.
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