Abstract
We present, to the best of our knowledge, the first known detailed analysis and fair comparison of complexity of a 56Gb/s multi-band carrierless amplitude and phase (CAP) and discrete multi-tone (DMT) over 80km dispersion compensation fiber-free single-mode fiber links based on intensity modulation and direct detection for data center interconnects. We show that the matched finite impulse response filters and inverse fast Fourier transform (IFFT)/FFT take the majority of the complexity of the multi-band CAP and DMT, respectively. The choice of the multi-band CAP sub-band count and the DMT IFFT/FFT size makes significant impact on the system complexity or performance, and trade-off must be considered.
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