Waveguide interface

Details Waveguide interface Waveguide interface

2007-03-27

2007-03-27

Font, Frank G. (Department: 2883)

Optical waveguides

Planar optical waveguide

Thin film optical waveguide

C385S129000, C385S130000, C385S132000

Reexamination Certificate

active

11299007

ABSTRACT:
Apparatus and associated systems for transmission of signals within a wide bandwidth (e.g., from DC to40GHz and above) include a conduction path and ground structures in an arrangement to provide a smooth transition between propagation in a coplanar waveguide mode and propagation in a microstrip waveguide mode. Some embodiments may be provided without vias, for example, by providing low impedance connections between ground structures on different layers, where the connections are made external to a medium between the layers. Some embodiments may feature a monotonically decreasing gap between a signal conduction path and a coplanar ground structure. Such embodiments may be used, for example, to provide a low loss, wide bandwidth interface between a coaxial transmission line and a microstrip transmission line. As another example, one or more such structures may be used in an electro-optic modulator to control an optical signal.

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