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7. Multi-mode transmission
The considerable increase in data rates transmitted over optical fibers, in conjunction with advances in WDM technology, has led to interest in the fiber's capacity in terms of information theory, i.e. the maximum data rate it can transmit. This limit, which no-one considered in the early days of optical transmission, now appears to be a stumbling block that will be reached in the next few years. One solution for increasing the data rate transmitted over an artery is, of course, to lay a new cable alongside the saturated one. But researchers also wondered whether there was still a way of increasing the data rate transmitted over a single fiber. Since 2010, research has been very active in two directions: multi-mode transmission in a conventional fiber, and the use of multi-core fibers (known as MCF).
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Multi-mode transmission
Polarization-maintaining and dispersion-compensating fibers
Bibliography
Conferences
Two major conferences are held each year, showcasing the latest advances in optical telecommunications research:
ECOC (European Conference on Optical Communications), which takes place in a European city in September. The website address is http://www.ecocxxxx.org where xxxx designates the...
Standards and norms
Recommendations concerning the various types of optical fiber for telecommunications, available on the International Telecommunication Union (ITU) website at http://www.itu.int/rec/T-REC-G.652/fr
Directory
Manufacturers – Suppliers – Distributors (non-exhaustive list)
A few major manufacturers share the worldwide market for optical fibers and cables for long-distance telecommunications networks. These "generalist" groups manufacture just about every type of fiber used in telecommunications, and are capable of producing thousands of kilometers of fiber.
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