Abstract

The advent of the erbium-doped fiber amplifier has led to the construction of many attractive transmission systems in the 1.5 µm region such as ultra-long distance systems⁽¹⁾⁽²⁾, large capacity CATV systems⁽³⁾⁽⁴⁾, and optical soliton transmission systems⁽⁵⁾. On the other hand, the 1.3 µm transmission system, where most terrestrial fiber transmission systems installed around the world operate, makes great demands on the development of amplifiers operating at 1.3 µm region. To date, however, there have been no practical amplifiers developed yet.

© 1993 Optical Society of America