Question

Q3/ Analogue optical fiber communications link have OSNR = 10 dBm and the signal

to noise ratio (SNR) = -200dBm. What is the indication about this system? Suggest a

solution about this problem.

Answer 1

The optical signal may be polarized, but the noise is usually not and, depending on the receiver polarization sensitivity, the noise must be considered with a single or two polarizations. Any active (or passive) linear optical device amplifies (or attenuates) simultaneously the incoming signal and the incoming noise