Abstract
The use of Erbium Doped Fiber Amplifiers (EDFAs) as in-line optical repeaters allows significantly increased fiber transmission distance. Coherent detection schemes can further enhance this fiber amplifier capability because coherent detection offers high receiver sensitivity and narrow IF (Intermediate Frequency) filtering function. Recent experimental results have clearly demonstrated the advantages of combining fiber amplifier technology and coherent systems in long distance transmission applications.1,2,3 However, in order to determine commercial viability, the experiments using robustly packaged modules are essential.
© 1990 Optical Society of America
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