Frequency comb distillation for optical superchannel transmission

Optical frequency combs can potentially provide an efficient light source for multi-terabit-per-second optical superchannels. However, as the bandwidth of these multi-wavelength sources is increased, it result in low per-line power. amplifiers be used to overcome power limitations, but accompanying spontaneous noise degrade performance systems. To this, we demonstrate wideband reduction comb lines using a high-Q microring resonator whose resonances align with lines, providing tight filtering multiple at same time. By distilling this way, are able reduce required line OSNR when coherent communications system. Through tests on 19.45-GHz-spaced generating 71 18 Gbaud, 64-QAM sub-channels spectral efficiency 10.6 b/s/Hz, find that noise-corrupted signal-to-noise ratio by ~ 9 dB carriers transmitter side, and 12 local oscillator receiver side. This demonstration provides method enable support high high-capacity communications.