Can you please explain the difference between BER (with No-FEC) ,
PRE-FEC BER and Post-FEC BER??
As per my understanding , PRE-FEC BER is the BER at the I/p of the
FEC Decoder and Post FEC BER is the BER at the o/p of FEC Decoder.
But when I saw the graph of BER vs OSNR , I see curves for No-FEC,PRE-FEC,POST-FEC and asymptotic..
Can you explain the difference elaborately.
Hello Krishna,
You wrote:
Can you please explain the difference between BER (with No-FEC) ,
PRE-FEC BER and Post-FEC BER??
As per my understanding , PRE-FEC BER is the BER at the I/p of the
FEC Decoder and Post FEC BER is the BER at the o/p of FEC Decoder.
But when I saw the graph of BER vs OSNR , I see curves for No-FEC,PRE-FEC,POST-FEC and asymptotic..
Can you explain the difference elaborately.
PRE-FEC BER are the bit errors caused by attenuation, ageing,
temperature changes of the optical fiber.
PRE-FEC indicates that the signal on the optical fiber is FEC
encoded.
The FEC decoder will recover the original signal, but depending
on the PRE_FEC BER it will succeed to recover the original signal
completely without errors.
Or, if the BER on the fiber is too high, the recovered signal will
contain bit errors.
If the signal was FEC encoded the remaining bit errors after the
decoder are called POST_FEC BER.
The NO_FEC BER are the bit errors detected when no FEC coding is
used on the optical fiber.
See also: https://goo.gl/cuhbjj
Best regards, Huub.
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