A system and method for receiving output signals from each receiver of multiple receivers, the output signals generated based on receipt of a same transmission; incrementing a count value associated with each receiver based on the output signals; and determining whether a fault in a receiver exists based on the associated count values of the receivers.

 
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< Optical device for extracting a sideband signal from a composite signal including orthogonally modulated signals

> Ridge and mesa optical waveguides

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