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Optica Publishing Group
  • Optical Fiber Communications Conference
  • OSA Trends in Optics and Photonics (Optica Publishing Group, 2002),
  • paper TuT4

Modules for chromatic dispersion and dispersion slope management

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Abstract

Chromatic dispersion plays a dual and contradictory role in modern fiber optic communication systems. Its very essence—the dependence of the group velocity of the propagating light waves on their wavelength—hurts system performance by temporally spreading the pulses, leading to limitations on the transmitted bit-rate and range. However, in the absence of chromatic dispersion, nonlinear effects such as four-wave mixing and cross-phase modulation make high channel count WDM systems practically inoperable. Reconciliation of these two opposite effects is achieved by dispersion management: the transmission fiber is required to have non-zero, typically positive, dispersion and every so often along the link, an equal amount of negative dispersion is introduced to obtain a link average of zero or near zero dispersion. In such a dispersion managed link, the non-zero dispersion of the transmission fiber significantly attenuates the inter-channel nonlinear effects, while the linear effects of dispersion-induced pulse spreading are corrected by the introduced negative dispersion, allowing high channel counts and bit-rates in excess of 40 Gb/s.

© 2002 Optical Society of America

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