Optical unit having a longitudinal side coupling zone

Details Optical unit having a longitudinal side coupling zone Optical unit having a longitudinal side coupling zone

1980-03-31

1981-11-10

Lindsay, Jr., Robert L.

Glass manufacturing

Processes

Forming product or preform from molten glass

65121, 65 111, C03C 2502, L03B 17025

Patent

active

042996090

ABSTRACT:
An optical unit having at least one longitudinal side coupling zone characterized by the unit comprising at least one glass fiber having a glass core with a glass cladding layer surrounding the core with a step in the index of refraction from a greater to a lower value occurring at the junction between the glass core and cladding layer, the cross section of the glass fiber remaining uniform along the entire length and the core having at least one constriction to form the longitudinal coupling zone. To form the optical unit, a device utilizing a double crucible with a nozzle opening of the inner crucible being arranged to discharge into the nozzle opening of the outer crucible and provided with a means for regulating the flow therethrough is utilized. If the unit includes a plurality of optical fibers, these fibers may be individually formed and held together by an adhesive, the cladding of the fiber may be fused together or the unit may be formed jointly by utilizing a crucible having a plurality of nozzle openings for the inner crucible so that a continuous cladding layer is disposed around a plurality of cores.

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Kawasaki et al., "Low Loss Access Coupler . . . " Applied Optics, vol. 16, #7, Jul. 1977, pp. 1794, 1795.
Hill et al., "Efficient Power Combiner . . . " Applied Physics Letters, vol. 31, #11, Dec. 1977, pp. 740-742.
Barnowski, "Data Distribution Using Fiber Optics", Applied Optics vol. 14, #11, Nov. 1975, pp. 2571-2577.
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