Equalizing modal delay of high order modes in bend...

Details Equalizing modal delay of high order modes in bend... Equalizing modal delay of high order modes in bend...

2011-01-04

2011-01-04

Ullah, Akm E (Department: 2874)

Optical waveguides

Optical fiber waveguide with cladding

C385S127000, C385S130000

Reexamination Certificate

active

07865050

ABSTRACT:
Described are multimode optical fibers in which the differential in the mode delay for higher order modes is reduced for bending insensitive MMF. The result is preservation of low differential mode delay and high bandwidth while low bend loss is achieved. The designs are based on choosing a combination of a core profile and a cladding structure with a negative trench positioned at a radius related to the core profile. A feature of the preferred embodiments is a core with a hybrid refractive index profile. The hybrid refractive index profile is essentially a combination of a standard alpha profile and a step profile at the outer edge of the alpha profile.

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