THEORETICAL AND EXPERIMENTAL INVESTIGATION OF RHODAMINE B-DOPED POLYMER OPTICAL-FIBER AMPLIFIERS

High-power (620 W) and high-gain (28 dB) amplification was achieved by a rhodamine B (RB)-doped GI polymer optical fiber amplifier (POFA) wi th a l-m length, A theoretical analysis of the amplification in the RE -doped GI POFA was carried out using the rate equation for the fast th ree-level system, The calculated gain behavior reasonably fit the expe rimental data. The possibility of higher power (more than 620 W) and h igher gain(more than 28 dB) amplification covering a wide range in the visible region is shown from the calculation. Absorption and emission cross sections of RE in poly(methyl methacrylate) bulk were determine d and used in the calculation. The values of the cross sections (sigma (amax) = 3.4 . 10(-20) m(2), sigma(emax) = 3.4 . 10(-20) m(2)) were ap proximately 10,000 times larger than those of Er3+ in GeO2-SiO2 glass.