Gazillion Bits, Inc.

Aladin H Kumel

Aly F Elrefaie

An optical fiber having a strongly negative dispersion characteristic that is well suited for use as a dispersion compensating fiber is described. The optical fiber comprises a primary core, a primary cladding surrounding the primary core, a secondary core surrounding the primary cladding, and a secondary cladding surrounding the secondary core, wherein a plurality of voids is formed within the secondary core. The voids in the secondary core are elongated and run parallel to the fiber axis, and form a spatially periodic pattern when viewed in cross-section. In one preferred embodiment, the voids are circular and the spatially periodic void pattern comprises hexagonal unit cells having central members, whereby each void is the same distance from each of its six nearest neighbors. The optical fiber exhibits a strongly negative dispersion characteristic, thereby reducing the required length of dispersion compensating fiber per unit distance of optical fiber span.

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Cairo, Egypt

Aladin H Kumel