Fiber To The Home
Since the first installations of fiber optic networks in the late 1970s, the goal of the fiber optic industry has been to install fiber optics all the way to the home. From an economic standpoint, fiber was immediately cost effective in the long-distance networks. Compared to copper or digital radio, fiber’s high bandwidth and low attenuation easily offset its higher cost. Compared to copper wire used in telephony, fiber could carry thousands of times more phone conversations hundreds of times further, making the cost of a phone connection over fiber only a few percent as much as transmitting over copper.This photo was used many times in the early days to illustrate the information carrying advantage of optical fiber:
It took only a few years before fiber optics dominated the long distance market. Crews buried cables underground or ran aerial cables on poles nonstop for a decade to upgrade long distance service. At the same time, technology was developed for submarine cables and by the late 1980s, all overseas communications expansion was done by fiber optics, replacing copper cables and satellites. Today, virtually all long distance communications is carried over the installed fiber optic network.
The next step was connecting local central offices, the link between subscribers and the switched phone network. Around the time the long distance networks were being completed, consumer use of the Internet took off. It was the Internet that drove the communications revolution by connecting anyone with a PC to a worldwide source of information and communication and forced the expansion of fiber into communications networks. Metropolitan phone networks became overloaded quickly and fiber optics was ready to provide the expansion capability. The scope of metropolitan fiber optic installations was obvious to anyone driving around town, as it was hard to drive anywhere without encountering roads torn up for the installation of conduit and fiber optic splicing trucks blocking the roadways.
Then the telecom/Internet "bubble" burst in 2001. The Internet “bubble” that caused the telecom “bubble” and thereby the fiber optic “bubble” caused the downfall of a tremendous number of companies and left the industry with a glut of both installed fiber backbone capacity and fiber optic component manufacturing capacity. In a good illustration of capitalism at work, the cost of fiber optic components took a nosedive as supply outstripped demand. Since the market bust, fiber prices are dirt cheap. One analyst compared fiber prices to kite string and fishing line, both of which are more expensive than the current prices of top quality optical fiber. The bad news is a lot of people got hurt as the market collapsed, but the good news is it set the stage for the next big application for fiber optics.
Many homes today are connected with aging, low-performance copper telephone wire that cannot support DSL connection speeds that allow the phone companies to compete with the cable modems used by CATV companies for broadband access. These aging phone lines not only cannot carry high bandwidth digital signals, they are extremely expensive to maintain just for POTS (plain old telephone service.) Savings in maintenance alone were projected by a 2005 Telcordia report to pay back the cost of installing fiber in under 20 years, irrespective of revenue from new services.
One problem with converting homes from copper to fiber was the immense size of the task. Long distance cables represent about 10% of the telecom network. Metropolitan networks represent another 10%. But the connection to the home, traditionally called the "last mile," represents about 80% of all the cabling in telecom, making conversion of copper to fiber to the home a massive task.
Besides component prices dropping as a result of oversupply, new network architectures have been developed that allow sharing expensive components for FTTH. A passive splitter that takes one input and broadcasts it to as many as 32 users cuts the cost of the links susbstantially by sharing, for example, one expensive laser with up to 32 homes. This is what we call a PON network, or passive optical network.
More on FTTH network architecture and protocol.
Each home needs to be connected to the local central office with singlemode fiber, through a splitter generally placed close to the homes connected to it. Every home will have a singlemode fiber link placed underground or aerial to the phone company cables running down the street and a network interface device containing fiber optic transmitters and receivers will be installed on the outside of the house. The incoming cable needs to be terminated at the house, tested, connected to the interface and the service tested.
So fiber is now gaining acceptance in the final frontier of telephone networks, the “last mile”—the connection to the home. Phone companies are now realizing the only choice for upgrading the subscriber connection is fiber to the home (FTTH). Service providers have committed billions of dollars to connecting millions of home with fiber in the near future.
Right now, Verizon is the leader in the US in FTTH, but the US trails many other countries around the world in converting to FTTH. Progress requires massive capital investment and training lots of people to install FTTH, or FTTP (fiber to the premises as they call it.) Even the CATV companies are considering fiber to replace aging coax, since the price is right and performance unlimited.
Here is recent data on worldwide FTTH (from Heavy Reading), showing the growth rate:
And here is a graph showing FTTH connections as a percentage of households in 2012 (from the FTTH Council, click here for a larger version of the graph for easier reading.):
Besides the telcos, several other groups are installing FTTH.
National governments: Countries with a national telecom policy usually favor FTTx for their national broadband networks. Some homes may be connected with fiber, but where FTTH is not priced reasonable, wireless or satellite connections may be preferred.
Municipalities: Some of the first FTTH systems were installed by cities - progressive ones like Palo Alto, CA did it at the request of their high-tech citizens, some did it to entice businesses to move there, like Anaheim, CA some did it (or are trying to) because they were not pleased with the service of telcos or CATV companies. The latter often found the telcos or CATV companies to be formidable opponents who did not always play fair! Most municipal FTTx projects use rights of way available to the city through city-owned utilities such as Chattanooga, TN which offers 1Gb/s FTTH already. Google has made municipal FTTH popular by having a competition for a city to get Gigabit FTTH installed by them - and Kansas City won the competition but many other cities are benefiting from the program. Below is a map of communities in the US installing their own broadband networks based on fiber. (Source Community Broadband Networks)
Utilities: Owning rights of way to the home convinced some utilities to try FTTH or FTTC. Ethernet over power lines is becoming a option for power companies who can use power lines for the final connection to the home. FTTx is even becoming real for rural customers through rural electrical cooperatives.
Private companies: There are private companies that will build municipal FTTH networks under an agreement with the city, similar to CATV agreements. In addition, some contractors building large subdivisions or apartments are installing FTTH with the assumption that they can connect with telecommunications companies for services to resell.
Here is a Google Map of worldwide FTTH Projects.
- Technical Information on FTTX From The FOA Online Reference Guide:
- FTTH Overview
- FTTx Architectures, MDUs (Multiple Dwelling Units)
- FTTH PON Protocols
- FTTH Installation
- FTTH Testing
- FTTx Online Tutorial
- Here's links for more information on FTTx
- Training & Certification
- FOA Certification Overview
FOA FTTx Certification Requirements
FOA-Approved Training Programs