Optical modulator

Details Optical modulator Optical modulator

2006-08-08

2006-08-08

Palmer, Phan (Department: 2874)

Optical waveguides

Temporal optical modulation within an optical waveguide

Electro-optic

C385S008000, C385S045000

Reexamination Certificate

active

07088875

ABSTRACT:
An object of the invention is to provide a Mach-Zehnder type optical modulator that can reduce wavelength chirp occurring in a modulated light, and also can reduce an optical loss with a small sized configuration. To this end, according to the present Mach-Zehnder type optical modulator, in a configuration where optical waveguides and a coplanar electrode are formed on a substrate having an electro-optical effect, a polarization inversed region is formed in a part of an interaction portion of the substrate, and a signal electrode is arranged above one of parallel waveguides in a polarization inversed region and is arranged above the other parallel waveguide in a non-inversed region. Furthermore, a surface area of the substrate positioned on both sides of each of the parallel waveguides is lowered to provide a ridge structure section, and a buffer layer is formed on a ridge side face thereof.

REFERENCES:
patent: 6678428 (2004-01-01), Seino et al.
patent: 6853758 (2005-02-01), Ridgway et al.
patent: 11-167032 (1999-06-01), None
I.E. Barry, et al., “Ridge Waveguides In Lithium Niobate Fabricated By Differential Etching Following Spatially Selective Domain Inversion”, Applied Physics Letters, vol. 74, No. 10, Mar. 8, 1999, pp. 1487-1488.

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