High speed semiconductor laser driver circuits

Details High speed semiconductor laser driver circuits High speed semiconductor laser driver circuits

H - Electricity

01

S

H01S 3/00 (2006.01) H01S 5/042 (2006.01)

Patent

CA 2294753

A semiconductor laser driver circuit that provides single supply operation over a wide supply voltage range (e.g., 3V to 5.5V), is capable of high speed data transmission, and is programmable over a wide laser modulation current range (such as 5mA to 60mA). The circuit includes temperature sensitive circuits to adjust for changes in Vbe over the operating temperature range, and to adjust a bias current to maintain transistor gm in the presence of temperature changes. Also included is an adaptive drive feature to accommodate different laser drive currents. Details of these and other features are disclosed.

L'invention concerne un circuit d'attaque pour laser à semiconducteur, à mode d'alimentation unique sur une large gamme de tensions d'alimentation (par exemple, 3 à 5 V), qui offre une grande vitesse de transmission des données et est programmable sur une large gamme de courants de modulation (par exemple, 5 à 60 mA). Le circuit en question comporte des circuits sensibles à la température permettant de s'adapter aux changements de Vbe sur la gamme des températures de fonctionnement, et aussi d'ajuster un courant de polarisation afin d'assurer le maintien de transistor gm face aux changements de température. L'invention concerne également une fonction d'attaque adaptative qui permet un fonctionnement avec différents courants d'attaque de laser. On décrit en détail ce type de fonction et un certain nombre d'autres fonctions.

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