Thermal control for laser diode used in outside plant communications terminal
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United States of America Patent
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Jul 30, 1991
Grant Date -
N/A
app pub date -
Apr 3, 1990
filing date -
Apr 3, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus implementing the method are provided for controlling optical power output level of a laser diode modulated during a burst mode interval by digital data transitions within a shared logical bus optical communications network and over a predetermined thermal gradient. The method comprises the steps of: optically monitoring a component of the optical output power of the laser diode during each burst mode interval and converting the component into a control signal, establishing a reference signal and comparing the control signal with the established reference signal and for providing a logical condition from said comparison, generating a strobe signal from information related in time to the burst mode interval, storing the logical condition upon receipt of the strobe signal, integrating the stored logical condition over a time period to provide an integrated control signal, and regulating current flow through the laser diode in accordance with the integrated control signal.
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