Optical waveguides – Directional optical modulation within an optical waveguide
Reexamination Certificate
2006-06-06
2006-06-06
Ullah, Akm Enayet (Department: 2874)
Optical waveguides
Directional optical modulation within an optical waveguide
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:
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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.
Doi Masaharu
Sugiyama Masaki
Fujitsu Limited
Staas & Halsey , LLP
Ullah Akm Enayet
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