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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 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.
For CL code in the L2C signal, the acquisition approach is based on the orthogonality of long PRN code. Hyper code method and the average correlation have certain limits in the overlap and average degree separately. And then, considering acquisition time, reliability and implementation complexity, the improved method that combine the Hyper code method and average correlation method is presented in...
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