dispersion shifted fiber (fiber optics) (DSF)
Several monomode fibers with special doping have been developed to compensate for signal distortions caused by optical amplifiers and dispersion during transmission over longer optical fiber distances: The Dispersion Shifted Fiber (DSF), the Non Dispersion Shifted Fiber( NDSF) and the Non Zero Dispersion Shifted Fiber( NZDSF).
The Dispersion Shifted Fiber (DSF) is a fiber with special doping standardized by the International Telecommunication Union ( ITU) in Recommendation G.653, in which the zero crossing of the chromatic dispersion has been shifted to the third optical window at 1,550 nm. The remaining dispersion in the DSF fiber is close to 0, well below the 15 ps/nm/km of a conventional fiber. The DSF fiber can be used in local area networks and is suitable for data rates of 10 Gbps.
Thanks to improved dispersion, pulse broadening is reduced in this optical window suitable for use with erbium doped fiber amplifiers( EDFA). The link length and transmission frequency can be increased as a result.