Abstract
As 100-Gb/s coherent systems based on polarization- division
multiplexed quadrature phase shift keying (PDM-QPSK), with aggregate wavelength-division
multiplexed (WDM) capacities close to 10 Tb/s, are getting widely deployed,
the use of high-spectral-efficiency quadrature amplitude modulation (QAM)
to increase both per-channel interface
rates and aggregate WDM capacities is the next evolutionary step. In this
paper we review high-spectral-efficiency optical modulation formats for use
in digital coherent systems. We look at fundamental as well as at technological
scaling trends and highlight important trade-offs pertaining to the design
and performance of coherent higher-order QAM transponders.
© 2012 IEEE
PDF Article
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