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We present for the first time a theoretical model of Er3+-Tm3+-Pr3+ codoped fiber pumped with both 800&#x2009;nm and 980&#x2009;nm lasers to explore possibility of this co-doped system as all-wave fiber amplifier. The rate and power propagation equations of the model are solved numerically and the dependence of the gains at 1310, 1470, 1530, 1600, 1650&#x2009;nm windows on fiber length is calculated. The results show that with pump power of 200&#x2009;mW/200&#x2009;mW, when the concentrations of Pr3+, Tm3+, Er3+ are around 1.7&#x00D7;1024, 3.9&#x00D7;1024, 1.2&#x00D7;1024 (ions/m3), respectively, the signals at 1310, 1470, 1530, 1600, 1650&#x2009;nm may be nearly equally amplified with gain of 13&#8211;16.0&#x2009;dB in the active fiber with length of 23.5&#x2009;m; the co-doping concentrations and fiber length and pump powers may be further optimized to reduce the ripple

Optimization of Multiple Active Ion Doped Fiber Amplifiers for Three Communication Windows