Achromatic coupler

Details Achromatic coupler Achromatic coupler

G - Physics

02

B

G02B 6/28 (2006.01) C03B 23/057 (2006.01)

Patent

CA 2108589

Abstract of the Disclosure An achromatic fiber optic coupler of the type wherein three single-mode optical fibers are fused together along a portion of the lengths thereof to form a coupling region. Each fiber includes a core and a cladding, the lowest refractive index of the fiber claddings being n2. The fibers are disposed in a triangular array in the coupling region. A matrix glass body of refractive index n3 surrounds the coupling region, n3 being lower than n2 by such an amount that the value of .DELTA.z-3 is less than 0.125%, wherein .DELTA.2-3 equals (n22-n32)/2n22.

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