In this work, a two- level model for Erbium-doped fiber amplifiers and ring lasers based on optical transmission parameters is proposed. The advantage is that these parameters can be directly determined from fiber-transmission measurements. Formulas are given for the absorbed pump power, and gain for amplifier as well as output power of the laser. The model compares well with previously publishe
Key Words : Laser, Optic fiber, Erbium, Optic Amplifier.