Stephen Corteselli

Real-time implementation of digital signal processing for coherent optical digital communication systems

Digital signal-processing-based coherent optical communication systems are widely viewed as the most promising next-generation long-haul transport systems. One of the biggest challenges in building these systems is the implementation of signal processors that are able to deal with signaling rates of a few tens of giga-samples per second. In this paper, we discuss implementation options and design considerations with respect to hardware realization and DSP implementation.

Generation of 224-Gb/s multicarrier offset-QAM using a real-time transmitter

We present the first real-time transmitter generating a multicarrier offset-QAM signal at 224 Gb/s after polarization multiplexing. Low penalties are achieved in a back-to-back experiment using a novel FPGA platform including two high-speed DACs running at 32 GS/s.

Generation of a Digitally Shaped 55-GBd 64-QAM Single-Carrier Signal Using Novel High-Speed DACs

We present a novel 2-channel arbitrary waveform generator (AWG) prototype, generating complex signal constellations with 6-bit digital-to-analog conversion (DAC) of up to 72 GS/s at a 6-dB bandwidth of 23 GHz. We generate a 55-GBd root-raised cosine shaped single-carrier 64-QAM signal.

Generation and FEC-decoding of a 231.5-Gb/s PDM-OFDM signal with 256-iterative-polar-modulation achieving 11.15-b/s/Hz intrachannel spectral efficiency and 800-km reach

A 231.5-Gb/s PDM-OFDM signal with 256-iterative-polar-modulation, outperforming 256-QAM by 1.2 dB in required OSNR after soft-FEC decoding, is generated, FEC-decoded, and transmitted over a record distance of 800 km with 11.15-b/s/Hz intrachannel spectral efficiency.