| 摘要 |
PURPOSE:To exclude dependence on polarization and to miniaturize an element by combining a reciprocal mode converter, a non-reciprocal mode converter, and a mode selecting part. CONSTITUTION:The guide light made incident on a core part from an incidence/ exit part 1 has the quasi-TE mode and the quasi-TM mode separated to a waveguide a and a waveguide b respectively in a selecting part 8 and is made incident on a non-reciprocal mode converting part 9, and respective guided light are subjected to 50% mode conversion and are propagated to a reciprocal mode converting part 10 and are converted to 100% quasi-TE mode and 100% quasi-TM mode by waveguides a and b respectively and are made incident on a selecting part 8', and the quasi-TM mode in the waveguide b has the power shifted to the waveguide a by 100% and is emitted to an incidence/exit part 2 together with the quasi-TE mode. The guided light from the incidence/ exit part 2 to a core part 14 is emitted to an incidence/exit part 3 through the selecting part 8'. The converting part 10, and a selecting part 8. The guided light from the incidence/exit part 3 is emitted from an incidence/exit part 4, and the guided light from the incidence/exit part 4 is emitted to an incidence/ exit part 1, and this element functions as an optical circulator. |
