This document compares three types of optical amplifiers: Erbium Doped Fiber Amplifiers (EDFA), Raman amplifiers, and Semiconductor Optical Amplifiers (SOA). It provides a specification comparison and characteristics comparison of the three amplifiers and discusses their WDM band capabilities. References are provided for EDFA, Raman amplifier, and SOA technologies.

1. AMPLIFIERS: EDFA,RAMAN & SOA Comparision
>> SPECIFICATION COMPARISION
>>CHARACTERISTICS COMPARISON
>>WDM BAND

2. *****************************************************************************************************************************References
EDFA-Erbium Doped Fiber Amplifier
EDFA block

3. RAMAN AMPLIFIER
SOA-Semiconductor Optical Amplifier