Electro-optic system controller and method of operation
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United States of America Patent
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Dec 17, 2002
Issued Date -
N/A
app pub date -
Mar 2, 2000
filing date -
Dec 11, 1997
priority date (Note) -
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Abstract
A method for calibrating a laser module system includes the processes of connecting testing equipment used for laser calibration to the laser output; setting preamplifier gain to nominal; connecting input of preamplifier to ground; turning off the DC bias for laser; canceling the offset voltage of the preamplifier; recording the monitoring photodiode dark current; incrementing the DC bias to the laser; reading P.sub.L ; computing dP.sub.L /dI.sub.L ; setting the DC bias to threshold; recording P.sub.LTH ; recording the photodiode current I.sub.PT ; recording the temperature of laser module; connecting the preamplifier to provide a V.sub.REF input signal to the laser module input increment preamplifier gain G.sub.1 while reading power output P.sub.L with instrument; determining the preamplifier gain G.sub.F needed to obtain full scale output of laser power (P.sub.LM); determining the corresponding photodiode current for above condition I.sub.PM ; calculating the effective responsivity R.sub.eff of the module containing the laser and the photodiode; and storing the effective module responsivity R.sub.eff in memory.
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