Ultrafast optical modulator

Details Ultrafast optical modulator Ultrafast optical modulator

1989-10-23

1990-05-22

Tarcza, Thomas H.

Amplifiers

Parametric amplifiers

Semiconductor type

350 9614, G02B 610

Patent

active

049280767

ABSTRACT:
An ultrafast traveling wave optical modulator capable of functioning at frequencies greater than 100 GHz having an optical waveguide parallel to a transmission line. The optical waveguide is in a substrate of electro-optic material (GaAs with GaAlAs layers forming the optical waveguide). The transmission line is a pair of coplanar electrodes on the substrate. A superstrate having an effective dielectric constant substantially equal to the square of the index of refraction of the substrate (a GaAs body in which the electric field on the line is substantially confined) eliminates the mismatch in velocity of propagation of the traveling electrical and optical signals thereby increasing the response time of the modulator so that it can function when the electrical modulating signal on the line exceeds 100 GHz in bandwidth.

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