| 摘要 |
PURPOSE:To execute an exact phase modulation being free form a malfunction by constituting the titled modulator of a push-pull type, and impressing a voltage by which phases of light in each linear waveguide part have the same magnitude each other and become each reverse code, and a voltage before and after a part where a composite phase of each phase is inverted, to an electrode part. CONSTITUTION:The titled modulator is provided with two pieces of linear waveguide parts 13, 14 having each equal length and width between two Y branch waveguide parts 11, 12, and constituted of a push-pull type in which electrodes 15, 16 have been placed on the linear waveguide parts 13, 14, respectively. In case a voltage has been impressed between the electrodes 15, 16, when electric fields whose directions are reverse to each other and whose magnitudes are equal are generated in the linear waveguide parts 13, 14, in accordance therewith, phases of light propagated in the linear waveguide parts 13, 14 also become each reverse code and the same magnitude. Therefore, a phase (namely, a phase of light which has been synthesized and outputted as a vector by the Y branch waveguide part 12) of an output light has only one state of (omicron) and (pi), and an incomplete phase state does not exist. |
