| 摘要 |
PCT No. PCT/JP93/00446 Sec. 371 Date Apr. 22, 1994 Sec. 102(e) Date Apr. 22, 1994 PCT Filed Apr. 6, 1993 PCT Pub. No. WO93/20468 PCT Pub. Date Oct. 14, 1993The present invention provides an asymmetrical lens showing different sets of optical characteristics as projected on two planes that are parallel to the optical axis of the lens and perpendicular to each other and satisfying the following simultaneous system of equations.(w ORTHOGONAL 2)/(w ORTHOGONAL 1)=(f ORTHOGONAL 2)/(f ORTHOGONAL 1)[2](w PARALLEL 2)/(w PARALLEL 1)32 (f PARALLEL 2)/(f PARALLEL 1)[3](d ORTHOGONAL 1)=|(s ORTHOGONAL 1)|(s PARALLEL 1)[4](d2)=|(s ORTHOGONAL 2)-(s PARALLEL 2)[5]Since the asymmetry of an asymmetrical lens according to the invention is clearly defined by a given simultaneous system of equations, it can be effectively used to optically couple optical waveguides with a low optical loss level if the optical waveguides operate with different waveguide modes, if the waveguide modes of the optical waveguides are not similar relative to one another, if the optical waveguides have mutually different sets of optical characteristics or even if the optical waveguides show astigmatism in their respective radiation patterns.
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