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After a certain distance transmission in the wavelength division system, the optical signal-to-noise ratio of...

After a certain distance transmission in the wavelength division system, the optical signal-to-noise ratio of the signal at the receiving end will decrease to a certain extent. The main reason is which of the following?

A.

Use of EDFA

B.

Use of demultiplexer

C.

No new fiber is used

D.

Fiber attenuation is too large

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