Optical fiber coupler of improved signal distribution characteristics
First Claim
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1. A coupler comprising:
- a central in put optical fiber radically surrounded uniformly by N number of fibers, output optical fibers of the N number of fibers having optical cores uniformly surrounded by optical cladding, the N number of fibers having radii "r" of the central optical fiber is determined by the equation;
space="preserve" listing-type="equation">R=(r)(1-sin θ
/sin θ
wherein θ
is 360°
/2N, and the central optical fiber and the N number of fibers being optically fused together radially along an optical coupling length corresponding to that coupling length along which optical power transmitted by the central optical fiber is coupled completely and distributed uniformly radially to the output optical fibers having the optical cores proportionately spaced the same from an optical core of the central optical fiber.
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Abstract
A coupler (2,3) comprises, a central single mode optical fiber (5) and N number of glass fibers (4), having radii of equal dimensions, fused together along biconic tapered sections (13, 13) to couple optical power from the central fiber (5) completely and uniformly to only the fibers (4) that have optical cores (6).
29 Citations
16 Claims
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1. A coupler comprising:
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a central in put optical fiber radically surrounded uniformly by N number of fibers, output optical fibers of the N number of fibers having optical cores uniformly surrounded by optical cladding, the N number of fibers having radii "r" of the central optical fiber is determined by the equation;
space="preserve" listing-type="equation">R=(r)(1-sin θ
/sin θwherein θ
is 360°
/2N, and the central optical fiber and the N number of fibers being optically fused together radially along an optical coupling length corresponding to that coupling length along which optical power transmitted by the central optical fiber is coupled completely and distributed uniformly radially to the output optical fibers having the optical cores proportionately spaced the same from an optical core of the central optical fiber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of making an optical fiber coupler comprising the steps of:
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providing N number of fibers having radii "r" of equal dimensions; providing a central input optical fiber having a radius "R", the radius "R" determined by the equation;
space="preserve" listing-type="equation">R=(r)(1-sin θ
/sin θwherein θ
is 360°
/2N;surrounding said central input optical fiber by said N number of glass fibers, wherein output optical fibers of the N number of fibers have optical cores uniformly surrounded by optical cladding; fusing together optically the central optical fiber and the N number of fibers radially along an optical coupling length corresponding to that coupling length along which optical power transmitted by the central optical fiber is coupled completely and distributed uniformly to the output optical fibers having the optical cores proportionately spaced the same from an optical core of the central optical fiber. - View Dependent Claims (10, 11)
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12. An array of optical fibers in a tube for producing an optical coupler, comprising:
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a central single mode optical fiber, N number of glass fibers of equal radii "r" surrounding and packed together with the central optical fiber, each output optical fiber of the N number of fibers is provided by a corresponding optical core surrounded by optical cladding, a tube encompassing all the fibers, and a radius "R" of the central fiber is determined by [R=(r)(1-sine Theta)/(sine Theta), wherein Theta is 360 degrees/2N]
space="preserve" listing-type="equation">R=(r)(1-sin θ
/sine θwherein θ
=260°
/2N. - View Dependent Claims (13, 14, 15, 16)
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Specification