| 摘要 |
67487-377 Disclosed is a dielectric wave guide having circular birefringence. The wave guide has a circular central area having a refraction index n1. An intermediate area surrounding said central area comprises a plurality of angular sectors alternating first and second types. The total number of sectors is 8 or a multiple thereof. The sectors of the first type have a refraction index n3 which is constant while the sectors of the second type have a refraction index n4 which varies in substantially inverse proportion to the square of the distance from the longitudinal axis of the wave guide, n3 always being not greater than n4. An outer annular area (cladding) surrounds the intermediate area and has a constant refraction index n2. The wave guide is twisted along its axis. The sectors of the second type have an elasto-optic coefficient under torsion stresses which is different from that of the sectors of the first type. |
