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27 Feb 2017

As fiber optic networks have developed for higher speeds, longer distances, and wavelength-division multiplexing (WDM), fibers have been used in new wavelength ranges, namely "bands". Fiber transmission bands have been defined and standardized, from the original O-band to the U/XL-bands. This article will mainly illustrate the evolution of the typical fiber transmission bands used for different optical telecom systems.

Among these bands, the O-band, also called the Original-band, was the first band used in optical telecommunication because of the small pulse broadening (small dispersion); Single-mode fiber transmission began in the "O-band" just above the cutoff wavelength of the SM fiber developed to take advantage of the lower loss...

06 Oct 2015
What Are Optical Amplifiers

An optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal. Together with wavelength-division multiplexing (WDM) technology, which allows the transmission of multiple channels over the same fiber, optical amplifiers have made it possible to transmit many terabits of data over distances from a few hundred kilometers and up to transoceanic distances, providing the data capacity required for current and future communication networks.

Functions of Optical Amplifiers

Broadly speaking, optical amplifiers may be used within an optical network as boosters, in-line amplifiers, or pre-amplifiers. The following picture shows a simple WDM...