Optical waveguide fiber achromatic coupler

摘要

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 n. sub. 2. The fibers are disposed in a triangular array in the coupling region. A matrix glass body of refractive index n.sub.3 surrounds the coupling region, n.sub.3 being lower than n.sub.2 by such an amount that the value of &Dgr;.sub.2-3 is less than 0.125%, wherein &Dgr;.sub.2-3 equals (n. sub.2.sup.2' -n.sub.3.sup.2)/2n.sub.2.sup.2.