Optical Amplifiers

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In order to transmit signals over long distances (>100 km) it is necessary to compensate for attenuation losses within the fiber. Initially this was accomplished with an optoelectronic module consisting of an optical receiver, a regeneration and equalization system, and an optical transmitter to send the data. Although functional this arrangement is limited by the optical to electrical and electrical to optical conversions. Several types of optical amplifiers have since been demonstrated to replace the OE – electronic regeneration systems. These systems eliminate the need for E-O and O-E conversions.