Abstract
We evaluate single-carrier modulation techniques for 100 Gb/s single-laser data
center interconnects. We present numerical performance analysis for various
single-carrier schemes including pulse amplitude modulation (PAM), carrierless amplitude
phase modulation, and orthogonal multipulse modulation in the presence of optical
modulator bandwidth limitations and nonlinearity, clipping, quantization noise, and
fiber chromatic dispersion. The performance is evaluated in terms of the required
average optical power to achieve a target bit-error ratio for a given modulator
bandwidth. We compare the complexity of different designs in terms of the required
resolution and sampling rate of digital-to-analog (DAC) and analog-to-digital (ADC)
converters, as well as the number of complex operations required for digital signal
processing. We find that 4-PAM is the most power efficient scheme among those
considered, and that it can be implemented with DAC/ADC resolution as low as 5
bits.
© 2015 IEEE
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