All would benefit from FEC
•
Links with optical amplifiers will benefit 50% more
–
Similarly with APDs (avalanche photodiodes)
•
Any future high
-
tech 100G modulation scheme e.g. DQPSK will
probably need FEC
•
Anything at 25G/lane
–
If optical: for constant laser SNR/Hz (RIN), the extra bandwidth
means
worse SNR on faster channels. We can spend the SNR on EDC
–
If electrical: 10GBASE
-
KR backplane Ethernet has already chosen to
allow FEC, 25G crosstalk will be significantly worse
•
Links significantly affected by near
-
Gaussian crosstalk or "random"
jitter will benefit significantly
•
Expect all 25G, all 1550 nm, links with SOA, and some others, wi
ll
need FEC
•
Don't know enough about 10G/lane 10 m electrical cable to commen
t
•
Is that every PMD type?