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Regarding your request
-opto.lib file of OrCAD9.0 and all later versions contain the model of SONY SLD1121 laser diode.
-diode5.lib of Intusoft's PSpice 7.0 contains the model of HITACHI's HL7801 laser diode.
-an improvement of this model can be find in EDN magazine.
-one accurate model can be found Journal of Lightwave Technology vol.15, no.4, april 1997, page 717.
You can use these model text codes for improving your application. Please, take care on the differencies existing between the CADENCE and INTUSOFT SPICE versions.
Check also: http://content.honeywell.com/vcsel/technical/pending/vdc_modl.pdf http://www.e-insite.net/ednmag/archives/1998/071698/pdf/15di.pdf