Optical pulse compressor for optical communications systems

Optical waveguides – Having nonlinear property

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385123, 385 27, 385 37, 359138, 359161, H04J 1408

Patent

active

061084743

ABSTRACT:
In accordance with the invention, an optical pulse compressor comprises a pulse source, a section of nonlinear optical waveguide including a periodic structure, such as a Bragg grating, for providing positive dispersion and a section of linear optical waveguide including a negative dispersion component. The nonlinear waveguide should have a second order index N.sub.2 at least ten times the second order index N.sub.2 ' of the linear waveguide. The nonlinear waveguide is preferably chalcogenide fiber, with a Bragg grating photoinduced into the core. Because the grating is 4-5 orders of magnitude more dispersive than standard optical fiber, the length of the nonlinear waveguide section can be scaled down to a few centimeters with accompanying reduction of deleterious processes. Modeling suggests that compression factors of 5 with an initial 60 ps pulse are achievable with grating lengths of about 20 cm.

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patent: 5499134 (1996-03-01), Galvanauskas et al.
patent: 5717799 (1998-02-01), Robinson

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