Concentric core optical fiber coupler
First Claim
1. A fiber optical coupler, comprising in combination:
- a concentric core optical fiber element having coaxial inner and outer light conducting cores separated by intermediate cladding material and having external cladding material over said outer core;
a region of said concentric core optical element where said external cladding material is removed exposing a predetermined length of said outer core;
at least one single core optical fiber element having a light conducting core and external cladding covering said core;
a region of said at least one single core element where said respective external cladding is removed exposing a predetermined length of said single core, said length of said single core thus exposed being bonded to and optically matched to the length of said exposed outer core of said concentric core element; and
at least one other single core optical fiber element having a single light conducting core and external cladding and wherein the end of said respective single core has a numerical aperture substantially equal to and bonded to said inner core of said concentric core element.
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Accused Products
Abstract
A method for constructing and the resulting structural configuration of annput coupler for a concentric core optical fiber comprises removing the outer protective material of a concentric core optical fiber to expose the outer core back a predetermined distance from the end which includes the intermediate protective material or cladding and the inner core. A plurality of single core optical fibers are stripped so that their respective cores are exposed whereupon they are bonded to the exposed outer core by a transparent index matching epoxy, which bonding is located at the transition region where the exposed outer core begins and the outer cladding ends. The outer end of the concentric core fiber element including the intermediate protective material and the inner core is cleaved and at least one other single core optical element is cleaved and bonded in end to end abutting relationship with the inner core by transparent index matching epoxy. Additionally, opaque material is located on either side of the bonds to attenuate any optical energy not coupled between the cores.
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Citations
21 Claims
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1. A fiber optical coupler, comprising in combination:
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a concentric core optical fiber element having coaxial inner and outer light conducting cores separated by intermediate cladding material and having external cladding material over said outer core; a region of said concentric core optical element where said external cladding material is removed exposing a predetermined length of said outer core; at least one single core optical fiber element having a light conducting core and external cladding covering said core; a region of said at least one single core element where said respective external cladding is removed exposing a predetermined length of said single core, said length of said single core thus exposed being bonded to and optically matched to the length of said exposed outer core of said concentric core element; and at least one other single core optical fiber element having a single light conducting core and external cladding and wherein the end of said respective single core has a numerical aperture substantially equal to and bonded to said inner core of said concentric core element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for coupling at least one single core optical fiber to each core of a dual concentric core optical fiber having coaxial inner and outer cores separated by intermediate cladding and including external cladding and a plastic coating over the outer core, comprising the steps of:
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removing the plastic coating for a first length at one end of the concentric core optical fiber and exposing the external cladding; removing the external cladding for a second and smaller length relative to said first length to expose the outer core of said concentric core optical fiber; exposing the core of at least one single core fiber; positioning and bonding said core of said single core fiber against the exposed outer core with an index matching bonding agent at a predetermined point back from said end of said concentric core fiber; applying opaque material adjacent the location of bonding for absorbing extraneous optical power not coupled between the outer core and said core of at least one single core fiber; exposing the core of at least one other single core fiber having a numerical aperture substantially matching that of the inner core of said concentric core optical fiber; positioning and bonding the core of said at least one other single core fiber in end to end relationship with the inner core and wherein said bonding is effected with an index matching agent; and applying opaque material between the location of the inner core bond and the outer core bond for absorbing extraneous optical power not coupled between the core of said at least one other single core fiber and the inner core. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification