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Transmission Technology: what’s the big deal? - page 18 / 46

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18 / 46

Dispersion-Shifted Fiber (DSF) – Oops!

Move the zero dispersion point to 1550nm, so no dispersion compensation required for 1550nm signals, even at 10G.

However, lack of dispersion at 1550 aggravates FWM and severely limits optical power levels for C-band DWDM systems.  Thus, DSF was a “bad idea” for DWDM.

Substantial amounts of DSF in some U.S. networks.

Small effective core area, so very nonlinear.

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