Optical modulator

Optical waveguides – Directional optical modulation within an optical waveguide

Reexamination Certificate

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C385S008000

Reexamination Certificate

active

07058241

ABSTRACT:
The present invention has an object to provide a Mach-Zehnder optical modulator for achieving the reduction of wavelength chirping caused in a modulated light. To this end, according to the present invention, in a Mach-Zehnder optical modulator configured by forming an optical waveguide and a coplanar electrode on a substrate having an electro-optic effect, a polarization inversion region is formed on a part of a portion where lights being propagated through a pair of parallel waveguides and a high frequency electric signal being propagated through a signal electrode interact to each other, and also the signal electrode is arranged on one of the parallel waveguides in the polarization inversion region and is arranged on the other parallel waveguide in a non-inversion region.

REFERENCES:
patent: 2002/0159666 (2002-10-01), Gates et al.
patent: 53-90747 (1978-08-01), None
patent: 2-167525 (1990-06-01), None
Nadege Courjal et al., LiNbO3 Mach Zehnder Modulator with chirp adjusted by Ferroelectric domain inversion, IEEE photonics Technology Letters, vol. 14, No. 11, dated Nov. 11, 2002 pp. 1509-1511.
Nadege Courjal, et al., “LiNbO3Mach-Zehnder Modulator With Chirp Adjusted by Ferroelectric Domain Inversion,” IEEE Photonics Technology Letters, vol. 14, No. 11, Nov. 2002, pp. 1509-1511.
Weidong Wang, et al., “Bandpass Traveling-Wave Mach-Zehnder Modulator in LiNbO3with Domain Reversal,” IEEE Photonics Technology Letters, vol. 9, No. 5, May 1997, pp. 610-612.
PCT Search Report for Application PCT/JP02/12824.

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