Abstract
100G dense wavelength-division multiplexing networks with reconfigurable
optical add–drop multiplexers (ROADMs) enable dynamically reconfigurable
networks and are therefore part of the solution needed to meet increasing
bandwidth and routing flexibility requirements for transport networks. ROADMs,
in particular cascaded ROADMs, also incur penalties including those induced
by passband narrowing, frequency drift, and imperfect isolation. As networks
migrate toward denser wavelength assignments in search of higher capacity,
these issues will become more challenging. Here, passband and in-band crosstalk
effects for long-haul ROADM-enabled 112 Gb/s polarization division multiplexing
quadrature phase shift keying systems are examined. We investigate the pulse
format dependence for passband narrowing/frequency detuning. We also demonstrate
a spectral weighting method to evaluate crosstalk penalties for widely varying
crosstalk spectral content. Our experimental results demonstrate that the
conventional crosstalk metric is insufficient. Finally, we demonstrate experimentally
and in simulation a nonlinearity-enhanced crosstalk penalty that results from
the nonlinear parametric interaction between the primary signal and crosstalk.
We show that this penalty is more limiting than the nonlinear interactions
between signal and amplified spontaneous emission noise.
© 2012 IEEE
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