الفهرس 
Schematic Diagram a simple Doped Fiber AmplifierOnly 14 pages are availabe for public view
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Abstract
This work investigates Raman gain for backward pumping using three different fiber types. The
rate and propagation equations characterizing Fiber Raman Amplifiers (FRAs) are
numerically solved. In this work, the gain is simulated for the given FRA parameters
affecting on Raman gain for all optical backward pumped fiber Raman amplifier such as fiber
type, fiber length, pump power and gain coefficient for enhancement the gain of fiber Raman
amplifier. from obtained results, gain is strongly dependent on the fiber length and pumping
power. Also, gain is obtained as a function of fiber length and pump power.
Also due to the benefits of Raman amplifier for Long-Haul UW-WDM Optical Communications
Systems we have investigated the effects of many parameters on the gain of Raman amplifier.
The main objective of this work is to solve the problem of attenuation that occurs in gain
of feedback pump Raman amplifier, To solve this problem we design model of feedback
pump Raman amplifier to improve the attenuation in gain where two of the feedback
pump Raman amplifier are used in cascaded form to overcome the attenuation in gain and
we succeeded in solving this problem and get a gain without attenuation. Also in this
research we presented the results in the case of using one feedback pump Raman
amplifier compared to the model that we designed to show the difference between the
two cases. Three types of fibers with different gain characteristics are used in our
numerical simulations to show the results.