In a WDM system, after a distance of transmission, the OSNR of the signals at the receive end decreases to a certain extend. Which of the following is the main cause?
A. Use of EDFA
B. The fiber attenuation is too large.
C. New optical fiber is not used.
D. Use of Demultiplexer Multiplexer
In a WDM system, after a distance of transmission, the OSNR of the signals at the receive end decreases to a certain ext
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