Cladded optical fiber having a longitudinal side coupling zone

Details Cladded optical fiber having a longitudinal side coupling zone Cladded optical fiber having a longitudinal side coupling zone

1978-09-21

1982-10-26

Lee, John D.

G02B 5172

Patent

active

043558631

ABSTRACT:
An optical fiber having a core surrounded by a cladding layer which has an index of refraction less than the index of refraction of the core characterized by a longitudinal side coupling zone being formed by a longitudinal opening extending through the cladding layer of the fiber to expose a portion of the core. The optical fiber of the invention is particularly useful in conjunction with a light sensitive detector and is useful in a mixer where more than one fiber are joined together either in a bundle or in a strip configuration. The fiber with the side coupling zone can be formed by drawing the fiber from a workpiece having a core or rod member surrounded by a sleeve member or layer which is provided with the opening or can be drawn from a molten material utilizing a double crucible in which the opening of the inner crucible is provided with at least one bulge extending to the edge of the opening of the outer crucible.

REFERENCES:
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patent: 3777149 (1973-12-01), Marcatili
patent: 4021097 (1977-05-01), McMahon
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patent: 4103154 (1978-07-01), d'Auria et al.
patent: 4136929 (1979-01-01), Suzaki
patent: 4240694 (1980-12-01), Pan
C. Stewart et al., "Directional Couplers for Optical Fibre Communication Systems", Proceedings 3rd European Conf. on Optical Communications, Sep. 1977.
T. Ozeki et al., "Optical Directional Coupler Using Tapered Sections in Multimode Fibers", App. Phys. Letts., vol. 28, No. 9, May 76, pp. 528-529.
Aulich et al., "High-Aperture, Medium-Loss Alkali-Lead Silicate Fibers Prepared by the Double Crucible Technique", Optical Meeting on Optical Fiber Transmission, Feb. 1977, Williamsburg, Virginia, pp. TuC5-1 to TuC5-4.

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