Abstract
We report a novel digital coherent receiver based on sampling the signal
in the optical domain to overcome the speed limitations of electrical
analog-to-digital converters. Digital coherent receivers with aggregate
optical sampling rates of up to 112 GHz are realized experimentally. The
performance of such receivers is investigated in transmission experiments.
Transmission of 56 GBd quadrature phase-shift keying signals over 610-km
standard single-mode fiber and coherent detection with electronic impairment
mitigation is demonstrated. The employed electrical analog-to-digital
converters have only 20 GHz bandwidth and a sampling rate of 50 GHz.
© 2011 IEEE
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