Launch interface electrode structure for suppressing...

Details Launch interface electrode structure for suppressing... Launch interface electrode structure for suppressing...

2006-08-08

2006-08-08

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave temporal modulation

C359S245000, C359S255000

Reexamination Certificate

active

07088489

ABSTRACT:
A reduced size RF signal and ground electrode interface is configured to provide better field confinement of dominant coplanar waveguide mode in the propagation direction and reduce coupling RF energy into a substrate beneath the launch, while matching the impedance of the launch to both that of the coplanar microwave electrode structure overlying the interaction region, and that of the external RF connection to the launch. In ground plane embodiments, an underlying ground plane provides better modal confinement of the dominant coplanar waveguide mode and precludes coupling of RF power to the substrate under the launch. In other embodiments, finite width electrodes provide better modal transition and mitigate against coupling to substrate modes, while providing a pad geometry that facilitates connections to external transmission line components.

REFERENCES:
patent: 5416859 (1995-05-01), Burns et al.
patent: 6069729 (2000-05-01), Gill et al.
patent: 6304685 (2001-10-01), Burns
patent: 6552365 (2003-04-01), Miyahara

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