Precoder and decoder for duobinary modulation over equalized 50-m SI-POF

This work presents a novel CMOS transceiver that enables 50-m 1-mm step-index plastic optical fiber (SI-POF) to increase transmitted data rate up to 3.125 Gbps using amplitude duobinary modulation, in addition to continuous-time equalization. For that purpose, a duobinary precoder and a duobinary decoder have been designed in a cost-effective 0.18-μm CMOS technology fed with 1.8 V, consuming 27.9 mW in total. Additionally, a new model based on low-pass Bessel filter has been proposed to simulate the effect of the equalized channel, achieving excellent agreement with experimental data. Post-layout results validate the advantages of the proposed transceiver.

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