Recently, many research works have been focused on the fiber optic devices for optical communication\r\nsystems. One of the main interests is on the optical amplifiers to boost a weak signal in the\r\ncommunication systems. In order to overcome the limitations imposed by electrical regeneration, a\r\nmeans of optical amplification was sought. The competing technology emerged: the first was Raman\r\namplification. One reason was that the optical pump powers required for Raman amplification were\r\nsignificantly higher than that for Erbium doped fiber amplifier (EDFA), and the pump laser technology\r\ncould not reliably deliver the required powers. However, with the improvement of pump laser\r\ntechnology Raman amplification is now an important means of expanding span transmission reach and\r\ncapacity. We have deeply studied an analytical model for optical distributed Raman amplifiers (ODRAs)\r\nin the transmission signal power and pump power within Raman amplification technique in co-pumped,\r\ncounter-pumped, and bi-directional pumping direction configurations through different types of fiber\r\ncable media. The validity of this model was confirmed by using experimental data and numerical\r\nsimulations.
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