Directional coupler type optical device and a driving method...

Details Directional coupler type optical device and a driving method... Directional coupler type optical device and a driving method...

G - Physics

02

F

G02F 1/035 (2006.01) G02B 6/26 (2006.01) G02F 1/313 (2006.01)

Patent

CA 2070259

ABSTRACT OF THE DISCLOSURE A l-input/2-output or 2-input/2-output directional coupler type optical device comprising a junction including two optical waveguides arranged parallel to each other and each fitted with an electrode for controlling a propagation constant, the incidence end or ends of one or both of the optical waveguides being connected to curved or straight optical waveguides, thus forming an incidence-side lead section, and the respective emergence ends of the two optical waveguides being optically connected to curved or straight optical waveguides, thus forming an emergence-side lead section. An electrode for suppressing the mode coupling is mounted on each optical waveguide of the emergence- or incidence-side lead section. A high extinction ratio of 30 dB or more can be obtained in either of cross and through modes by activating a required one of the mode coupling suppressing electrodes while applying an electrical signal to each propagation constant control electrode.

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