Electrode systems for optical modulation and optical modulators

Details Electrode systems for optical modulation and optical modulators Electrode systems for optical modulation and optical modulators

2007-05-15

2007-05-15

Bovernick, Rodney (Department: 2874)

Optical waveguides

With optical coupler

Particular coupling structure

C385S002000

Reexamination Certificate

active

10740850

ABSTRACT:
An object of the invention is to provide an electrode system for optical modulation of an optical modulator to reduce a thickness “E” of an electrode required for velocity matching and for reducing a propagation loss in the electrode. A substrate2is made of an electrooptic material and has one and the other main faces2a, 2bopposing each other. An electrode system20A is provided on the substrate2for applying a voltage for modulating light propagating in optical waveguides6A and6B. The electrode system20A includes ground electrodes3A,3B and a signal electrode4. A ratio “W/G” of a width “W” of the signal electrode4to a gap “G” between the ground and signal electrodes is 0.8 or higher. Preferably, the substrate2has a thickness “T” of 20 μm or larger, in a region where the optical waveguides6A and6B are provided.

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