Multiple mode fiber with mode discrimination

Details Multiple mode fiber with mode discrimination Multiple mode fiber with mode discrimination

2005-04-05

2005-04-05

Lee, John D. (Department: 2874)

Optical waveguides

Optical fiber waveguide with cladding

Utilizing nonsolid core or cladding

C385S028000, C385S126000

Reexamination Certificate

active

06876805

ABSTRACT:
An optical fiber for reducing modal dispersion and increasing both travel distance and transmission speed. A core center is formed in the core of the optical fiber. The core center is doped with impurities, is hollow, or is pulled at a lower temperature to increase diffraction of the core center. The core center discriminates the low order modes such that only the high order modes are present in the optical fiber. Because the low order modes are absorbed or otherwise discriminated against, the range of propagation constants is reduced and modal dispersion is likewise reduced. High order modes can be launched in the optical fiber using a lens whose center portion is obscured or by using a diffractive lens to couple a source to the optical fiber.

REFERENCES:
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patent: 5485296 (1996-01-01), Healey et al.
patent: 5828802 (1998-10-01), Stolen et al.
patent: 6404966 (2002-06-01), Kawanishi et al.
patent: 20010024557 (2001-09-01), Hasegawa et al.
patent: 20020034362 (2002-03-01), Yamazaki et al.

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