Abstract
We propose and demonstrate a novel optical method to generate
multi-level signals with reduced driving voltage through degenerate
four-wave mixing processes. With the present approach, it is
possible to extend the size of the signal constellations and at the
same time reduce the modulator driving voltage without bandwidth
degradations. In our experiments, one amplitude shift keying (ASK)
signal and one differential phase shift keying (DPSK) signal are
used to generate one ASK-DPSK signal with clearly opened
eye-diagrams and error-free demodulation results. Our numerical
simulations show that the proposed method is applicable for
generating several 8-ary and 16-ary quadrature amplitude modulation
(QAM) signals with silicon waveguides at a higher modulation baud
rate.
© 2011 IEEE
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