The design and modeling of strongly pumped, doped silver halide fiber ampli
fiers are presented. Lasing properties of doped silver halides, in the near
or mid-IR region, are studied experimentally and analyzed, based on a rate
equation formalism. The analysis is applicable for both three- and four-le
vel systems, such as Er3+, Pr3+, and Nd3+. Optimal amplifier designs are su
ggested to obtain significant amplification. (C) 2001 Society of Photo-Opti
cal Instrumentation Engineers.