Abstract

In nonlinear long distance transmission, the distributed erbium doped fiber (d-EDF) is a promising component due to very low signal power excursions [1]. This allows a spacing between two pump power stations in the order of 100 km [1], when the pump wavelength is 1.48 μm. Thus having a signal wavelength near 1.55 μm, the background loss is canceled out by stimulated emission from both Raman scattering and erbium ions. Using a very small erbium concentration the noise figure may be minimized and transparency may be obtained for a total bidirectional pump power of around 100 mW giving noise figures near 10 dB [1],[2].

© 1993 Optical Society of America