The Internet in the U.S. relies on long-haul and middle-mile fiber routes that are used to connect every part of the country to the core internet hubs located in Virginia, Dallas, Chicago, Atlanta, Los Angeles. New York, and Denver. In more recent times, the growth of data centers has created additional major Internet hubs in places like Phoenix, Silicon Valley, Portland, and Seattle.
Like every other part of the industry, there has been a constant evolution in the lasers that were used to power the long-haul fiber routes. When I first got involved in working with companies providing transport in the early 2000s, the transport electronics delivered 1 GB (gigabit) speeds – something that everybody at the time thought was blazingly fast. Today, millions of homes are buying 1 GB broadband.
The Internet was exploding during the 2000s as millions of people started to buy broadband provided by DSL and cable modems. Gigabit transport routes became full, and carriers knew they had to upgrade. The IEEE standard for 10 GB transport was adopted in 2002, and over the next decade, it became the standard for transport fiber routes.
Of course, 10-gigabit transport routes grew full as growth continued, and carriers were looking for more speed. The IEEE standard for 40 GB transport was adopted in 2010, although a few vendors, like Nortel, had started to market 40 GB products as early as 2008. The biggest technical breakthrough for 40 GB lasers was the introduction of Digital Signal Processing, which better handled light dispersion across long-haul fiber routes. The higher speed became the industry standard for transport by 2012.
Next in the evolution were 100 GB lasers. This standard was also adopted by IEEE in 2010. This faster technology was slower to be adopted because of the relatively high cost of the lasers. By 2014, there were only about 600 deployments of this technology worldwide. But over time, 100 GB lasers became standard for anybody building transport fiber routes.
The next step in progressively faster lasers was 400 GB, with the IEEE standard adopted in 2017. Network owners started to introduce these faster lasers into networks in 2020, and by 2022, 400 GB lasers became the new standard for long-haul transport.
The general continuous growth of Internet traffic, and the new demand from AI, is pushing transport fiber owners to seek even faster lasers. A few vendors introduced 800 GB lasers as early as 2019. Ciena announced the 800 GB WaveLogic 5 laser in 2019, and Infinera and Windstream successfully tested a 800 GB long-haul route in 2020. While 400 GB lasers are still the most affordable option, Nokia and Ribbon say that they are now seeing a lot of demand for 800 GB lasers.
Ciena says it is seeing demand for even faster lasers and has installed a few fiber routes with 1.6 TB lasers for Lumen in the U.S., e& in the USA, and Cirion in Latin America.
The faster speeds are also moving down market into last-mile uses. Nokia is selling a lot of 800 GB pluggable fiber electronics for inside data centers.
This has been an amazingly fast evolution. As recently as 2019, almost everybody in the industry was still buying 100 GB lasers for transport, and in the few years since then, we’ve seen increases to 400 GB, then 800 GB, and now the beginnings of 1.6 TB. I remember seeing a PowerPoint at a trade show twenty or so years ago where a vendor claimed that within twenty years we’d be seeing terabit lasers. It was a bold prediction at a time when 10 GB lasers were cutting-edge technology, but it turned out to be a good prediction. I’m not even going to try to predict the speeds we’ll be seeing twenty years from now.







