Directional coupler type optical device and a driving method the

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

1992-05-29

1993-10-19

Gonzalez, Frank

Optical waveguides

With optical coupler

Particular coupling structure

385 8, 385 9, 385 21, 385 22, 385 40, G02B 610

Patent

active

052553345

ABSTRACT:
A 1-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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