Abstract
We introduce a flexible, software-defined real-time multi-modulation format receiver implemented on an off-the-shelf general-purpose graphics processing unit (GPU). The flexible receiver is able to process 2 GBaud 2-, 4-, 8-, and 16-ary pulse-amplitude modulation (PAM) signals as well as 1 GBaud 4-, 16- and 64-ary quadrature amplitude modulation (QAM) signals, with the latter detected using a Kramers-Kronig (KK) coherent receiver. Experimental performance evaluation is shown for back-to-back. In addition, by using the JGN high speed R&D network testbed, performance is evaluated after transmission over 91 km field-deployed optical fiber and reconfigurable optical add-drop multiplexers (ROADMs).
Highlights
W ITH the continual increase in demand for data-traffic at lower cost-per-bit, there is an increased interest in low-cost optical transceivers for data-center interconnects
Massive parallel processing capabilities of graphics processing unit (GPU) were exploited for processing single-polarization 5 Gbit/s differential quaternary phase-shift-keying (DQPSK) signals, correcting for intersymbol interference (ISI) using a finite impulse response (FIR) filter
Electrical driving signals for the in-phase and quadrature modulator (IQM) are provided by a 2-channel arbitrary-waveform generator (AWG) operating at 12Gs/s amplified by RF-amplifiers, whilst bias-tees and voltage sources control the bias of the modulator arms
Summary
W ITH the continual increase in demand for data-traffic at lower cost-per-bit, there is an increased interest in low-cost optical transceivers for data-center interconnects. Real-time DSP for optical differential quaternary phase-shift-keying (DQPSK) has been implemented on a GPU [16]–[18] In these papers, massive parallel processing capabilities of GPUs were exploited for processing single-polarization 5 Gbit/s DQPSK signals, correcting for intersymbol interference (ISI) using a finite impulse response (FIR) filter. Multi-modulation format software-defined GPU-based receiver and the first real-time demonstration of coherent KK detection. The fiber ring is part of the Japan Gigabit Network (JGN) high speed R&D network testbed [20] consisting of 3 commercial ROADMs in 2 separate Tokyo locations These results demonstrate the potential of software-defined receivers for low-cost optical links, exploiting the exponentially growing computing power of GPUs. This paper is an extension to the work presented at the European Conference on Optical Communications (ECOC) 2020 [21].
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