| 摘要 |
PURPOSE:To permit easy production, efficient sepn. of planes of polarization and control of polarized light and to decrease the loss of guided light by disposing two optical waveguides in proximity to each other and providing control electrodes to the respective optical waveguides. CONSTITUTION:The 1st optical waveguide which is made larger in both extraordinary refractive index and ordinary refractive index than a base plate 21 and the 2nd optical waveguide 23 which is made larger only in the extraordinary refractive index than the base plate are disposed in parallel, and electrode groups 24-26 are constituted. Only the TM mode polarized light of the light P incident to the waveguide 22 is then led out to the waveguide 23 and the difference in the phase velocities of respective polarization modes is controlled by the groups 24-26. Such device is usable as a modulator, switch and synthesizing element for planes of polarization. Both waveguides can be formed independently, and since the high refractive index forming materials are respectively of one kind, diffusion control is easy and there is no induction of crystal strain. Since the element is linear-shaped, the loss of the guided light is decreased. |
