Optical clock recovery

H - Electricity – 04 – L

Patent

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Details

H04L 7/027 (2006.01) H04B 10/12 (2006.01) H04B 10/17 (2006.01) H04L 7/00 (2006.01)

Patent

CA 2118407

A system for recovering a clock from an optically encoded signal uses a mode- locked laser (4). A modulator (2) is connected in common with the laser cavity (3) of the laser ana won a transmission path (1) which applies the input optically encoded signal to the modulator (2). The modulator (2) in response to the optically encoded signal modulates the phase-and/or amplitude of light in the laser cavity (3) thereby locking the phase and frequency of an output pulse stream to the timing wave of the optically encoded signal. In a preferred example, the modulator is a non-linear optical modulator used for cross-phase modulation (XPM) of the light in the laser cavity.

Système permettant de récupérer une cadence d'horloge provenant d'un signal codé optiquement, à l'aide d'un laser (4) à modes verrouillés. Un modulateur (2) est connecté à la cavité laser (3) du laser et à une voie de transmission qui applique au modulateur (2) le signal entré codé optiquement. En réaction au signal codé optiquement le modulateur (2) module la phase et/ou l'amplitude de la lumière dans la cavité laser (3) et verrouille ainsi la phase et la fréquence d'un courant d'impulsions de sortie sur l'onde de synchronisation du signal codé optiquement. Dans un exemple préféré, le modulateur est un modulateur optique non linéaire utilisé pour effectuer la modulation croisée de la phase de la lumière à l'intérieur de la cavité laser.

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