Possibility of Plastic Optical Fiber amplifiers doped with ER(C8h11f8o2)3

Plastic optical fiber amplifiers (POFAs), doped with Er(C8H11F8O2)3, having an energy system showing 3-level features have been investigated theoretically focusing on the condition for amplifying mainly the lowest signal mode (LP01 mode). We have studied the dependence of signal gain on fiber structure design for circular and ring doping conditions and have shown that the gain for the fundamental mode (LP01) and the second order mode (LP11 mode) is a strong function of the outer radius (ro) of the doping area. The gain for the LP01 mode becomes larger than that of LP11 mode when ro is less than 110 μm with doping concentration (N0) of 3 × 1020cm-3. A signal gain of 18.2 dB is predicted for LP01 mode for 9 cm long POFA with circular doping and ro of 80 μm when N0, the pump power and the core radius are 2.66 × 1020cm-3, 30 W and 250 μm, respectively. The gain is 12 dB larger than that for LP11 mode under the same condition.