Visible-Laser Driver Has Digitally Controlled Power Modulation

Abstract:Thecircuitinthefigurebelowincludesa10-bitdigital-to-analogconverter(DAC)with3-wireserialinputthatoperatesandmaintainsavisible-lightlaserdiodeatconstantaverageopticaloutputpower.Aseparatedigitalinputline(MOD)enablesacomparatorwithopen-drainoutput(IC4)toimplementdigitalcommunicationsbypulsingthelaser-diodethroughQ1.Maxim>AppNotes>A/DandD/ACONVERSION/SAMPLINGCIRCUITSAMPLIFIERANDCOMPARATORCIRCUITSFIBER-OPTICCIRCUITSKeywords:modulatedlaser,diodedriver,visible-lightlaser,optical,photodiode,photodiode,peakopticalJul01,2001power,visiblelaserdriverAPPLICATIONNOTE1811Visible-LaserDriverHasDigitallyControlledPowerModulationAbstract:Thecircuitinthefigurebelowincludesa10-bitdigital-to-analogconverter(DAC)with3-wireserialinputthatoperatesandmaintainsavisible-lightlaserdiodeatconstantaverageopticaloutputpower.Aseparatedigitalinputline(MOD)enablesacomparatorwithopen-drainoutput(IC4)toimplementdigitalcommunicationsbypulsingthelaser-diodethroughQ1.Manylaserdiodesincludeaphotodiodethatgeneratesacurrent