Optical transmission device and method for driving laser diode
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United States of America Patent
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Feb 27, 2001
Grant Date -
N/A
app pub date -
Jan 18, 2000
filing date -
Sep 16, 1997
priority date (Note) -
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Abstract
An optical transmission device obtains driving control data corresponding to a temperature detected by a temperature detection circuit (112) from memory means (173), controls a driving current to be supplied to a laser diode (100) based on the driving control data, and measures a driving current to be actually supplied to the laser diode whose emission power is held constant by an automatic optical output control circuit (115, 113). Further, when the difference between the measured driving current and a driving current determined by the driving control data corresponding to the detected temperature at that time exceeds an allowable range, the optical transmission device updates the driving control data. Upon determination of the deterioration of the laser diode, the progress of the deterioration of the laser diode is determined based on the difference between a driving current defined by driving control data corresponding to a newly measured temperature and an actual driving current formed by automatic optical output control. Therefore, a distinction between whether an increase in driving current due to the automatic optical output control results from the deterioration of the laser diode and whether it results from a variation in ambient temperature is reliably made.
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