| 摘要 |
PURPOSE:To form a liquid crystal optical switch reduced at its loss by removing a reflection loss due to the difference of refractive indexes between an electrode and liquid crystal at the transmission of light through a liquid crystal cell. CONSTITUTION:Light beams made incident from input optical fibers 1, 2 to a liquid crystal optical switch are made parallel by lenses 5, 6 and then turned to vertical polarized beams (S deflection) through a birefringent crystal or the like. The incident light beams are reflected by the inclined surfaces of trapezoidal glasses 1, 2 a shown by a short dashes line and made obliquely incident upon the liquid crystal 11. When electrodes 12, 13 and 14, 15 are connected respectively and voltages are impressed between the electrodes 12, 13 and between the electrodes 14, 15, potential differences (electric fields) are generated between the electrodes 12, 13 and between the electrodes 14, 15. The incident light beams are transmitted or fully reflected through/by the liquid crystal 11 between the electrodes 12, 13 and 14, 15 in accordance with the existence of the voltage and emitted from output optical fibers 4, 7. When the voltage are not impressed between the electrodes 12, 13 and between the electrodes 14, 15, the incident light beams are emitted from the output optical fiber 4 without the generation of a reflection loss. |
