Abstract

A new type of erbium doped fiber for optical amplifier was reported where erbium was doped in the center of the core and samarium doped in a ring in the cladding. By utilizing the spectral overlap of the absorption cross section of samarium in the inner-cladding and the emission cross section of erbium ion in the core, we demonstrated a new way of in-line control the gain spectrum of erbium doped amplifier pumped at 980 nm.

© 2000 Optical Society of America