Method to inject pilot tone into microcontroller-supervised...

Details Method to inject pilot tone into microcontroller-supervised... Method to inject pilot tone into microcontroller-supervised...

2007-12-25

2007-12-25

Singh, Dalzid (Department: 2613)

Optical communications

Diagnostic testing

Determination of communication parameter

C398S183000, C398S186000, C398S192000, C398S193000, C398S197000

Reexamination Certificate

active

10756626

ABSTRACT:
The power of a digital signal such as an optical data stream is set via digital-to-analog converter having a reference input for connection to a DC reference signal. The pilot tone is injected into the reference input of the digital-to-analog converter. In the place of a dual amplitude control (modulation current and pilot tone), the disclosed arrangement only requires a single control, thereby reducing cost, power consumption, microcontroller input/output activity, area occupation (PCB real estate) and failure rate.

REFERENCES:
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patent: 6137522 (2000-10-01), Melino et al.
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patent: 2004/0144913 (2004-07-01), Fennelly et al.
patent: WO 01/73377 (2001-10-01), None

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