A method for optimizing a dc operating drive current of a laser diode is
presented. Lasers of a particular type are characterized in terms of the
dependency of certain parameters on temperature and of the minimum bias
current required for adequate laser speed. The minimum bias current is
determined using the operating bias current minus the threshold current
all normalized by the threshold current. For individual laser diodes, the
threshold current and slope efficiency are obtained at various
temperatures to allow calculation at operating temperatures of interest.
The minimum laser bias current for speed can then be determined over the
operating temperature range. This may be done by setting the optical
power to the highest value calculated using this minimum acceptable bias
criterion over the operating temperature range. The ac and dc laser
driver current sourcing requirements may be computed to ensure laser and
module compatibility.