a Pico second is a trillionth of a second. a new laser that was developed for viewing chemical reactions in real time, pulses light FASTER then nanoseconds (in other words, a fraction of a nanosecond). it's speeds are measured in picoseconds.
apply that to communication and what do u get?? a trillion bits per second, from ONE laser! then of course, to add to that, you add more lasers of different frequencies to multiply your speed!
BTW, my source is Scientific American if you're wondering...