COMPARATIVE-STUDY ON TEMPERATURE-DEPENDENT MULTICHANNEL GAIN AND NOISE-FIGURE DISTORTION FOR 1.48-MU-M AND 0.98-MU-M PUMPED EDFAS

Temperature dependence of multichannel gain flatness and noise figure (NF) was compared for different pump wavelengths of 1.48 and 0.98 mu m on silica-based erbium-doped fiber amplifiers (EDFA's) through measur ement-based numerical simulation. Owing to its temperature sensitive p ump emission cross section, the 1.48-mu m pumping showed greater tempe rature sensitivity (maximum 0.75-dB gain flatness distortion with 0.57 -dB average gain level shift, 0.3-dB NF variation for 25 degrees C cha nge) than the 0.98 mu m pumping (maximum 0.5-dB gain flatness distorti on with 0.015-dB average gain level shift, 0.05-dB NF variation for 25 degrees C change). However, it was also found that distortion ripple spectra mainly coming from the changes of signal cross sections and as ymmetric gain temperature dependence necessitate compensation techniqu es in the EDFA link, irrespective of pump wavelength.