Abstract
We focus on Nyquist-WDM-based flexible optical networks and examine
the impact of introducing flexibility in physical layer design parameters
on the network level performance. The considered physical layer parameters
include the modulation format, the symbol-rate, the inter-subcarrier spacing,
the inter-superchannel spacing, and the launch power. In order to examine
the impact of allowing the symbol rate to be tuned on a super channel
basis, three alternative launch power schemes are considered: (i) optimum
launch power, (ii) constant launch power, and (iii) constant power spectral
density. Case study results from a realistic reference core network highlight
the identified trade-offs with respect to the utilized spectrum and the required
transponders. It is shown that significant savings can be achieved by allowing
the symbol rate to be dynamically tuned under different launch power options.
© 2013 IEEE
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