Abstract

Erbium-doped fiber amplifiers (EDFAs) are very promising as high gain and low noise optical amplifiers for single-mode fiber communication systems in the 1.55 µm wavelength band. However, wavelength dependence of the gain remains a subject of investigation in some applications, such as long haul transmission with cascaded amplifiers⁽¹⁾ or WDM systems⁽²⁾. It is well-known that codoping aluminum in the core of the erbium-doped fiber (EDF) is effective to broaden the gain spectrum of the EDFAs.

© 1993 Optical Society of America