Fiber Nonlinearities and Their Impact on Transmission Systems
Fiber Nonlinearities and Their Impact on Transmission Systems
Fiber Nonlinearities and Their Impact on Transmission Systems
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Self-Phase Modulati<strong>on</strong> (SPM)<br />
• The refracti<strong>on</strong> index of silica is weakly intensity<br />
dependent<br />
P<br />
n n + n ⋅<br />
• n 2 =2.6x10 -20<br />
m 2 /W for silica fibers<br />
• The n<strong>on</strong>linear refracti<strong>on</strong> index results in a phase<br />
change for the propagating light<br />
ΦNL = γPL e<br />
• γ is the n<strong>on</strong>linear coefficient. The phase change<br />
becomes significant when the power times the<br />
length of the system equals 1W-km<br />
2πn<br />
2<br />
γ =<br />
λ<br />
Tuesday, March 22, 2005<br />
=<br />
1 2<br />
A e<br />
A e<br />
12(32)
Change language