This paper is based on the numerical solution of the rate equations model and their gain dependences are discussed. Simulation of the amplifier gain versus the pump power, amplifier length, ion concentration and core radius has been done. In order to keep the fiber amplifiers doped with ytterbium as short as possible with high gain, it is best to increase the doped concentration. For 10m amplifier length, pump power of 25mW, core radius of 2.5m and 3 ion/m 25 10 3.5 doping concentration, the

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... ain is 60dB. Increasing of the core radius would increase the threshold pump power and at the above same conditions, the optimum gain is at 5m core radius. Keywords: Ytterbium Doped Fiber Amplifier (YDFA), Single mode, Population inversion and Three-level rate equations. ‫باالتربيوم‬ ‫المطعم‬ ‫الربح‬ ‫عالي‬ ‫الكفوء‬ ‫الرصاص‬ ‫ات‬ ‫فموروبور‬ ‫زجاج‬ ‫ليف‬ ‫مضخم‬ ‫يم‬ ‫كر‬ ‫جبار‬ ‫مؤيد‬ ‫االسدي‬ ‫حسين‬ ‫جابر‬ ‫داغر‬ ‫حسين‬ ‫يم‬ ‫الكر‬ ‫عبد‬ ‫الخالصة‬ ‫اعتماد‬ ‫و‬ ‫المعدل‬ ‫معادالت‬ ‫لنموذج‬ ‫العددي‬ ‫الحل‬ ‫عمى‬ ‫تستند‬ ‫التي‬ ‫الورقة‬ ‫ىذه‬ ‫مناقشة‬ ‫تمت‬ ‫الضخ,‬ ‫ة‬ ‫قدر‬ ‫مقابل‬ ‫المضخم‬ ‫بح‬ ‫لر‬ ‫محاكاة‬ ‫يت‬ ‫أجر‬ ‫عمييا.‬ ‫بح‬ ‫الر‬ ‫باال‬ ‫المطعم‬ ‫الميف‬ ‫مضخم‬ ‫نحفظ‬ ‫أن‬ ‫ألجل‬ ‫المب.‬ ‫قطر‬ ‫ونصف‬ ‫االيونات‬ ‫تركيز‬ ‫المضخم,‬ ‫طول‬ ‫يد‬ ‫نز‬ ‫أن‬ ‫االفضل‬ ‫من‬ ‫عالي,‬ ‫بح‬ ‫ر‬ ‫مع‬ ‫االمكان‬ ‫قدر‬ ‫ا"‬ ‫قصير‬ ‫بيوم‬ ‫تر‬ ‫طولو(‬ ‫لمضخم‬ ‫التطعيم.‬ ‫تركيز‬ 10m ‫ضخ(‬ ‫ة‬ ‫قدر‬ , ) 25mW ‫لب(‬ ‫قطر‬ ‫نصف‬ ,) 2.5m ) ( ‫تطعيم‬ ‫وتركيز‬ 3.5x1025 ion/m3 ( ‫بح‬ ‫الر‬ ‫يكون‬ ,) 60dB .) ( ‫ه‬ ‫قدر‬ ‫لب‬ ‫قطر‬ ‫نصف‬ ‫عند‬ ‫يكون‬ ‫بح‬ ‫ر‬ ‫أفضل‬ ‫أعاله,‬ ‫الشروط‬ ‫نفس‬ ‫وعند‬ ‫العتبة‬ ‫ضخ‬ ‫ة‬ ‫قدر‬ ‫من‬ ‫يد‬ ‫يز‬ ‫سوف‬ ‫المب‬ ‫قطر‬ ‫نصف‬ ‫يادة‬ ‫ز‬ 5m .)