This is a good article that talks about the next generation of speed
tests for transferring information. The article from
ComputerWorld shows that the research into DWDM and other types of
modulation are still progressing.

Wow! That’s fast TCP!.
Data has been sent across a wide-area optical network at 101Gbit/sec.,
the fastest-ever sustained data transmission speed, equivalent to
downloading three full DVD movies per second, or transmitting all of
the content of the Library of
Congress in 1… [KurzweilAI.net Accelerating Intelligence News]