SYSTEM PERFORMANCE EVALUATION OF AN OPTICAL SUPERCHANNEL ORIGINATED FROM DIFFERENT OPTICAL COMB GENERATION TECHNIQUES
Keywords:Optical comb generation, optical superchannel, recirculating frequency shifting, cascade of optical modulators, laser gain switching, coherent detection
We describe three optical comb generation techniques to be used as part of ultra-high bit rate (i.e. above Tb/s) systems: (i) recirculating frequency shifting, (ii) cascade of optical modulators, and (iii) laser gain switching. The comb generators were evaluated in two different scenarios for transmitting a 10-subcarrier superchannel (10Â xÂ 112Â Gb/s): (i) spectral narrowing due to filter concatenation and (ii) OSNR and signal degradation due to ASE accumulation and standard fiber propagation effects. By using a coherent receiver and offline digital signal processing, the techniques were compared in terms of bit error rate performance.
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