Optical waveguides – Temporal optical modulation within an optical waveguide – Electro-optic
Reexamination Certificate
2006-04-11
2006-04-11
Ullah, Akm Enayet (Department: 2874)
Optical waveguides
Temporal optical modulation within an optical waveguide
Electro-optic
C385S008000, C385S041000, C385S129000, C359S246000, C359S254000, C359S322000
Reexamination Certificate
active
07027668
ABSTRACT:
The present invention relates to an optical modulator including an optical waveguide, and at least one CPW-to-CPS transition. The CPW segments include a hot electrode; and a ground plane disposed on each side of the hot electrode, and they share a ground plane. The CPS segment extends along an interaction length of the modulator. In one embodiment, two driving signals are applied so that the modulator operates as a dual-drive modulator. In another embodiment, a domain-inverted region is formed in a substrate of the dual-drive modulator to overlap with one arm of the optical waveguide (MZI) and invert a sign of a phase shift induced in that arm. Finally, a fixed chirp can be introduced into the dual-drive modulator by asymmetrically positioning the interferometer arms into gaps of the CPW segments with respect to the hot electrode, and by employing unequal width gaps in the CPW segments.
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Gopalakrishnan Ganesh K.
Tavlykaev Robert F.
Taylor Scott T.
Covega Corporation
Dickinson Wright PLLC
Edwards, Esq. Jean C.
Rahll Jerry T.
Ullah Akm Enayet
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