Humidity tolerant electro-optic device

Optical waveguides – With optical coupler – Particular coupling structure

Reexamination Certificate

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Details

C385S001000, C385S002000, C385S003000, C385S004000, C385S015000

Reexamination Certificate

active

07844149

ABSTRACT:
The invention relates to an electro-optic modulator structure containing an additional set of bias electrodes buried within the device for applying bias to set the operating point. Thus the RF electrodes used to modulate incoming optical signals can be operated with zero DC bias, reducing electrode corrosion by galvanic and other effects that can be present in non-hermetic packages. The bias electrodes are at least partially separated from the substrate with a buffer layer, which in one embodiment has a small amount of conductivity. This conductive buffer layer reduces optical loss from the bias electrodes and also reduces DC drift.

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