High speed non-biased semiconductor laser diode driver for...

H - Electricity – 01 – S

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H01S 5/042 (2006.01) H03K 17/041 (2006.01) H04B 10/04 (2006.01)

Patent

CA 2237506

The length of the tail which results in an optical output from a laser diode after the laser diode is no longer being driven is reduced or eliminated by a laser diode driver with a tail eliminator. More specifically, the laser diode driver includes an energy drainage path that is activated when packet communication is over. In one embodiment of invention, the terminals of the laser diode are short-circuited to provide the energy drainage path. In another embodiment of the invention, the laser diode is reverse biased, so that charges stored in the laser diode are combined with charges which are provided thereto. Advantageously, the tail emission is substantially eliminated.

La durée de la lumière résiduelle émise par une diode laser après l'interruption de l'alimentation de cette dernière est réduite ou annulée à l'aide d'un dispositif d'attaque doté d'un éliminateur de lumière résiduelle. Plus exactement, ce dispositif d'attaque comprend un trajet de drainage d'énergie qui entre en fonction quand la transmission d'un paquet est terminée. Dans l'une des concrétisations de l'invention, les bornes de la diode laser sont court-circuitées pour créer le trajet de drainage d'énergie. Dans une autre concrétisation, la diode laser est polarisée en inverse et les charges qui y sont stockées sont combinées avec d'autres charges qui lui sont fournies. Il en résulte une réduction importante de la lumière résiduelle.

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