The last time we looked at this topic was September 3's "Facebook Backs Two Major Undersea Cable Projects, Google Joins Forces For One" in which I somehow veered off to Gilligan's Island and how the Professor kept the castaways' radio working.
No Gilligan this time.
From IEEE Spectrum, October 18:
Old-fashioned telecommunication carriers are falling behind in the global bandwidth race as global giants of content and cloud computing are building their own global networks. Facebook has commissioned electronics and IT giant NEC Corporation to build the world's highest capacity submarine cable. When finished it will carry a staggering 500 terabits—some 4000 Blu-Ray discs of data—per second between North America and Europe on the world's busiest data highway.
For decades, transoceanic cables were laid by consortia of telecommunication carriers like AT&T and British Telecom. As cloud computing and data centers spread around the world, Google, Amazon, Facebook and Microsoft start joining cable consortia, and in the past few years Google began building its own cables. The new cable will give Facebook sole ownership of the world's biggest data pipeline.
Transoceanic fiber-optic cables are the backbones of the global telecommunications network, and their change in ownership reflects the rapid growth of data centers for cloud computing and content distribution. Google has 23 giant data centers around the globe, each one constantly updated to mirror the Google cloud for users in their region. Three years ago, flows between data centers accounted for 77 percent of transatlantic traffic and 60 percent of transpacific traffic, Alan Mauldin, research director at TeleGeography, a market-research unit of California-based PriMetrica, said at the time. Traffic between data centers is thought to be growing faster than the per-person data consumption, which Facebook says increases 20 to 30 percent a year.Vying for maximum bandwidth at the intersection of Moore's Law and Shannon's limit
Fiber-optic developers have worked relentlessly to keep up with the demand for bandwidth. For decades, data capacity of a single fiber increased at a faster rate than the number of transistors squeezed onto a chip, the definition of Moore's Law. But in recent years that growth has slowed as data rates approached Shannon's limit, a point at which noise in the transmission system overwhelms the signal. In 2016 the maximum data rate per fiber pair (each fiber carrying a signal in one direction) was around 10 terabits per second, achieved by sending signals at 100 gigabits per second on 100 separate wavelengths through the same fiber.
Developing more sophisticated signal formats offered some improvement, but not enough to keep pace with the demand for bandwidth. The only way around Shannon's limit has been to open new paths for data delivery.
In 2018, Facebook and Google placed bets on broadening the transmission band of optical fibers by adding signals at a hundred new wavelengths to squeeze 24 terabits through a single fiber. Each bought one pair of fibers on the Pacific Light Cable stretching from Hong Kong to Los Angeles. The leader of the consortium, Pacific Light Data Communications, of Hong Kong, retained four other pairs in the six-pair cable. Although the cable was soon laid, the U.S. Federal Communications Commission has refused to license its connection to the U.S. network because of security concerns arising from its Chinese connections....
....MUCH MORE
