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We experimentally investigate the excess noise induced on a CV-QKD system in a WDM environment consisting of 4×100 Gb/s PDM-QPSK and 16×10 Gb/s OOK classical telecom signals. The influence of the receiver's noise, the Raman scattering and the four-wave mixing process are evaluated.
We split each stage of back-propagation into a linear and a nonlinear part in parallel. We show by simulation and experiment that negligible performance degradation is achieved with half implementation complexity by baud-rate nonlinear compensation.
We report a complete VCSEL optical link operating at 40-Gb/s (BER<10−12) with an eye opening of 0.56 UI and 6 dB of link margin. Transmitter pre-distortion enables substantial improvements in speed, jitter, and link margin.
We design, fabricate and demonstrate 850 nm VCSEL and PD arrays which operate at 25 Gb/s per channel, up to 600 Gb/s with 24 channels, for low-power parallel optical module applications. We also report a complete 25 Gb/s VCSEL to PD back-to-back link.
8 times 107 Gbit/s DWDM transmission is achieved over a 500 km field installed fibre link in the Deutsche Telekom network, indicating high link utilization of 1 bit/s/Hz spectral efficiency, needed for Terabit/s network capacity, required in a mid-term timeframe.
111-Gb/s transmission combined with 2 times 43-Gb/s and 8 times 10.7-Gb/s on a 50-GHz grid over 1,040-km field fiber and two ROADMs is demonstrated, showing the feasibility of 100G overlaying existing 10G/40G commercial systems.
We propose a multichannel PMD mitigation scheme using forward-error-correction (FEC) and distributed fast polarization scramblers that randomize PMD during each FEC burst-error-correcting-period. Numerical evaluations show substantial improvement in PMD tolerance and reduction in outage probability.
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