Optical waveguides – With optical coupler – Input/output coupler
Patent
1990-08-30
1991-08-06
Lee, John D.
Optical waveguides
With optical coupler
Input/output coupler
385 49, G02B 626
Patent
active
050371711
ABSTRACT:
A novel optical fiber structure is described which includes an end thereof for transmitting optical signals and substantially reducing reflections of optical signals thereat wherein the fiber end has a substantially flat end surface disposed at an angle to a plane perpendicular to the transmission axis of the fiber equal to or greater than sin.sup.-1 (NA
) where NA is the numerical aperture and n is the index of refraction of the fiber core material, and the fiber outer surface has adjacent the end surface a flattened portion of preselected depth and length whereby substantially all paraxial and meridional optical signals propagated along the fiber axis are transmitted through the end surface and skew rays transmitted along the fiber are substantially attenuated near the fiber end.
REFERENCES:
patent: 4684206 (1987-08-01), Bednorz et al.
patent: 4717226 (1988-01-01), Mori
patent: 4726641 (1988-02-01), Mori
patent: 4728170 (1988-03-01), Robertson
patent: 4730883 (1988-03-01), Mori
patent: 4865417 (1989-09-01), Yamamoto et al.
"Partially cladded triangular-cored glass optical fibers and lasers", Tynes, J. Opt. Soc. of America; vol. 64, #11, Nov. 1974, pp. 1415-1423.
Hamilton, Jr. Harold L.
Lund Mark W.
Barns Stephen W.
Lee John D.
Scearce Bobby D.
Singer Doanld J.
The United States of America as represented by the Secretary of
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