Microwaves transmit stock trades faster than fibre opticsJune 1, 2012
Nowhere is the phrase "time is money" taken more seriously than in the world of high-frequency securities "flash" trading, where the goal is to profit by being first to react to price differences between markets. Trying to tap that market, telecommunications companies are spending hundreds of millions of dollars laying submarine cables through the Arctic Ocean to shave milliseconds off the transit time between Tokyo and London.
Now the Wall Street Journal is reporting that traders are turning to old-fashioned microwave relay towers to speed deals between New York and Chicago. The newspaper reports that 10 companies have filed applications with the Federal Communications Commission to build such links.
Why microwaves? Is the speed of light too slow, as traders have complained? The Journal reports that microwaves take 4.25 milliseconds to travel between New York and Chicago, beating the 6.55 milliseconds for infrared light traveling through a fibre-optic cable, attributing the difference to more bends in the cable.