| 摘要 |
A dielectric line having a line curvature, consisting of at least two line sections which are connected to one another, of which at least one is curved, the line sections in each case consisting of a core having the refractive index n1 and of a sheath having the refractive index n2, where n1 > n1. The refractive index n2 of the sheath (6) is changed to n3 < n2 after the distance <IMAGE> where R = the radius of curvature of the curved line section (2), c/n2 = the speed of propagation of light in the sheath (6), vph = the local phase velocity = omega / beta , where omega = the angular frequency, beta = the phase constant of the beam wave axis (4) of the curved line section (2).
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