**Doped Fiber Amplifier Characteristic Under Internal and External Perturbation**

Siamak Emami1, Hairul Azhar Abdul Rashid2, Seyed Edris Mirnia1, Arman Zarei1, Sulaiman Wadi Harun1 and Harith Ahmad1 *1University of Malaya Malaysia, 2Multimedia University Malaysia, Malaysia* 
