Ethologus
Newbie level 4
I have the following problem:
Design a digital system transmitting a 4-Gbps NRZ signal over a 100-km path without the use of repeaters. The error rate must be 10^-9 or better.
My first step is to find the total system rise time which is:
.7 / (4x10^9) = .175ns
the selected fiber must have a pulse spread less than .175ns for 100km or
1.75 ps/km. The only fiber I found that has a pulse spread remotely close to this is a single mode at 1.3um (~4 ps/km).
Does anyone have any ideas as to how to approach this problem?
Thanx
Design a digital system transmitting a 4-Gbps NRZ signal over a 100-km path without the use of repeaters. The error rate must be 10^-9 or better.
My first step is to find the total system rise time which is:
.7 / (4x10^9) = .175ns
the selected fiber must have a pulse spread less than .175ns for 100km or
1.75 ps/km. The only fiber I found that has a pulse spread remotely close to this is a single mode at 1.3um (~4 ps/km).
Does anyone have any ideas as to how to approach this problem?
Thanx