Fiber Optic System Design Problem
时间：04-10
整理：3721RD
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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
You can distort the transmission source so that the signal arrives in synch. Solitons, etc.
Dispersion Compensation Fiber
Negative factor [ps/Km]