Optical modulator, method of achieving velocity matching and...

Optical: systems and elements – Optical modulator – Light wave directional modulation

Reexamination Certificate

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C359S320000

Reexamination Certificate

active

06958852

ABSTRACT:
A Mach-Zehnder optical waveguide is disposed in a substrate made of a material having an electro-optic effect. Coplanar-waveguide modulating electrodes are disposed on a principal surface of the substrate. A dielectric layer is disposed on a reverse surface of the substrate. A supporting substrate having a recess is disposed in contact with the dielectric layer such that the recess is located at a position corresponding to a modulating region. The relationship: ∈r>∈sis satisfied where ∈rrepresents the dielectric constant of the supporting substrate and ∈srepresents the dielectric constant of the dielectric constant of solid, liquid, or gaseous substance in the recess.

REFERENCES:
patent: 05093892 (1993-04-01), None
patent: A 9-211402 (1997-08-01), None
Yoneyama et al, “Velocity-Matched . . . Optical Modulator Using Inverted Slot Line”, IEEE Microwave and Guided Wave Letters, vol. 1, No. 8, p. 192, Aug. 1991.
Kawano, “High-Speed Shielded Velocity Matched . . . Optical Modulator”, IEEE J. of Quantum Electronics, vol. 29, No. 9, p. 2466, Sep. 1993.

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