Patent ID: 6483966
Filing Date: 2002-11-19
Classification: G02B

Abstract:
Singlemode lightwaveguide-coupling element being with a first end couplable to an end of an initial waveguide section which there has a basic final width (W0f) in a plane of curvature, further being couplable with a second end to an end of a final waveguide section which there has a basic initial width (Wn+1i) in said plane of curvature, said basic initial width (Wn+1i) being bigger than said basic final width (W0f), the lightwave directions of both waveguide sections being inclined at a predetermined total angle (&Dgr;&agr;) towards each other in said plane of curvature, characterized in that starting from said initial waveguide section said lightwaveguide element comprises a number (n) of intermediate waveguide sections, said number (n) being at least 1, that each of said intermediate waveguide sections at its end has a lightwave direction which is inclined towards the lightwave direction at its opposite end at an inclination angle (&Dgr;&agr;v), such that the sum of all inclination angles (&Sum;v=1n&it;Î”&it;â€ƒ&it;Î±v)equals the predetermined total angle (&Dgr;&agr;), that each of said intermediate waveguide sections at its end which is directed towards the directly preceding waveguide section, has an initial width (Wvi), that each of said intermediate waveguide sections further at its opposite end has a final width (Wvf) which is bigger than said initial width (Wvi) by a width difference (&Dgr;Wv) which follows the equation &Dgr;Wv=&Dgr;&agr;v(Wn+1iâˆ’W0f)/&Dgr;&agr;, that for each of said intermediate waveguide sections and for said final waveguide section its initial width (Wvi) equals said final width (Wvâˆ’1f) of the directly preceding waveguide section, and that each of said intermediate waveguide sections further has a length (lv) that is constant or steadily decreasing dependent on said final width (Wvf).