I'd like to take a minute to direct your attention to our latest eBook, 100 Gbps Networks See the Light.
In considering a migration to 100G, service providers have had to juggle three balls: deployment strategy, technology and economics.
While port price was initially the main consideration for 100G, a growing group of service providers are now looking at how opex cost plays into the total cost of ownership (TCO) of 100G versus 10G.
Following a number of years of trial deployments and experiments, 2011 has been a big year for 100G optical networking as more and more service providers are finding that it's more economical to migrate to 100G. 
Specific evidence of the 100G adoption trend can be found in the networks of two large service providers--Verizon (NYSE: VZ) and P&TLuxembourg--and one R&D network provider, Internet2.
These service providers are finding that the operations, administration and maintenance (OAM) costs required to operate a 100G link are lower than running 10 links of 10G each.
What's also helped make 100G more affordable for service providers has been the telecom and optical networking industry segment's coalescence around coherent optics, an innovation that enables service providers to forgo the use of modules to overcome dispersion compensation issues that become acute when service providers deploy 100G networks.
As 100G optical networks become a reality in the telecom world, FierceTelecom's new eBook, 100 Gbps Networks See the Light, will address how the service provider community is taking advantage of 100G optical networking to meet the bandwidth needs of their business and consumer clients.--Sean