There is also an option of bidirectional pumping, in which the gain fiber is pumped in both directions. Unlike Optical Time Domain Reflectometry (OTDR) OFDR works in the frequency domain using continuous wave (CW) light sources which enables higher signal to. The orientation of the pump can be either forward or backward with respect to the signal propagation, whereas the counter propagating one is called counter pumping the copropagating pumping scheme is called copumping. Optical Frequency Domain Reflectometry (OFDR) is a special technology which is used for the analysis of optical light paths and reflection characteristics in optical fibers and components. coupler for combining the pump and the signal wavelength, and isolators at the input and output ends. The results showed that the gain is higher in bidirectional pumping than in counter pumping, the gain changes with increasing the fiber length while the noise figure remain the same for short fiber lengths and the gain saturates differently for different pumping configuration at different fiber lengths and power levels of the signal. Simulation has been done by using optisystem 7.0 software simulation at signal wavelength of 1550 nm and a pump wavelength of 1450nm. Abstract-This paper describes the gain and noise performances of discrete Raman amplifier as a function of fiber lengths and the signal input powers for different pump configurations.
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