40gb/s is not that fast.
QUOTE (wikipedia)
OC-768 / STM-256x
OC-768 is a network line with transmission speeds of up to 39,813.12 Mbit/s (payload: 38,486.016 Mbit/s; overhead: 1327.104 Mbit/s).
OC-768 SONET interfaces have been available with short-reach optical interfaces from Cisco since as early as 2006. As of September 2007, Cisco will use OC-768 DWDM line cards from a third party. These line cards will plug into the Cisco chassis. These same line cards will also be made available to Siemens. These cards will use four Xilinx FPGA, a Power PC, a TI c6200 DSP, Four AMCC FEC, two DeMux and two Mux.
Infinera made a field trial demonstration data transmission on a live production network involving the service transmission of a 40Gb/s OC-768/STM-256 service over a 1,969 km terrestrial network spanning Europe and the U.S.
Though unused the standards go as high as 160gb/s
QUOTE (wikipedia)
OC-3072
Will be able to provide transmission speeds of around 159.25248 Gbit/s
Also note a 40gb/s connections is only 2.5GB/s which means a 80GB HD-DVD would take 32 Seconds. thus no where near the claimed 2 seconds.