Method to inject pilot tone into microcontroller-supervised DWDM transmitters
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United States of America Patent
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-
Dec 25, 2007
Grant Date -
Jul 29, 2004
app pub date -
Jan 13, 2004
filing date -
Jan 14, 2003
priority date (Note) -
Expired
status (Latency Note)
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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.
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