Abstract
This study compared two nonlinear distortion compensation techniques, SSII cancellation (in the frequency domain) and Volterra filtering (in the time domain), in a >50-Gbps/λ OFDM-IMDD LR-PON. Experiment results for SNR, BER, and data rate (based on a bit-loading algorithm) revealed that the performance of frequency-domain SSII cancellation is unaffected by power fading; however, it depends heavily on the precision of the mathematical model. Conversely, although time-domain Volterra filtering is affected by the faded waveform, adaptive-weighting provides flexibility in dealing with mixed nonlinear distortion, particularly that associated with the interplay between fiber dispersion and fiber nonlinearity. 4-channel WDM-OFDM and 3rd-order Volterra filtering were used to demonstrate the feasibility of the proposed scheme in a 200-Gbps IMDD system. Based on 10-GHz EAM and PIN, we achieved 200-Gbps transmission over a distance of 60 km with a loss budget of >30 dB, while providing support for 128 ONUs at >1.6 Gbps/ONU without the need for an inline amplifier or pre-amplifier.
Highlights
According to a report published by Cisco [1], metro traffic had surpassed long-haul traffic by 2014
This paper compares the performance of two approaches by which to compensate for nonlinear distortion in an orthogonal frequency-division multiplexing (OFDM)-intensity modulation and direct detection (IMDD) LR systems: subcarrier-to-subcarrier intermixing interference (SSII) cancellation and Volterra filtering
Under normal fiber launch power, power fading and/or significant modulator nonlinearity undermines the effectiveness of 2nd-order Volterra filtering
Summary
According to a report published by Cisco [1], metro traffic had surpassed long-haul traffic by 2014. Metro traffic is expected to continue growing at double the rate of longhaul traffic until at least 2019 This can be attributed primarily to rapid growth in the number of mobile devices and a change in the habits of users leading to increased internet activity. The use of 10G-class components and the IMDD scheme makes it possible for OFDM to achieve data rates of ≥ 40 Gbps with a reach of ≥ 60 km. This has made OFDM LR-PON one of the more promising candidates for the development of low-cost, highcapacity access networks with wide coverage. Based on 10GHz EAM and PIN, we achieved 200-Gbps transmission over a distance of 60 km with loss budget of >30 dB, while providing support for 128 ONUs at >1.6 Gbps/ONU without the need for an inline amplifier or pre-amplifier
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