Electrical pulse tranformation using optical delay lines

G - Physics – 02 – B

Patent

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Details

G02B 6/28 (2006.01) H01Q 3/26 (2006.01) H04B 10/18 (2006.01) G02B 6/34 (2006.01)

Patent

CA 2406928

A recirculating optical delay line (30) has a laser (32) controlled by wavelength control (33) so as to vary the wavelength of radiation over time to provide a first input (34) to an optical modulator (35). The modulator (35) modulates the intensity of the first input (34) with a pulsed electromagnetic frequency signal (36) to produce a pulsed modulated optical signal (39). The signal (39) passes through an optical coupler (40) into a delay loop (41) having a delay fibre (44) arranged to delay the signal (39) for a predetermined duration. The wavelength control (33) is arranged to vary the first input (35) so as to ensure that overlapping pulses of the signal (39) in the delay loop (41) are at different wavelengths, thereby inhibiting optical mixing effects between the overlapping pulses.

Une ligne (30) de retard optique à recirculation comporte un laser (32) commandé par une commande (33) de longueur d'onde de manière à faire varier la longueur d'onde du rayonnement dans le temps, pour fournir un premier signal d'entrée (34) à un modulateur optique (35). Le modulateur (35) module l'intensité du premier signal d'entrée (34) à l'aide d'un signal (36) de fréquence électromagnétique pulsé afin de produire un signal (39) optique modulé pulsé. Le signal (39) traverse un coupleur optique (40) et entre dans une boucle (41) de retard comportant une fibre (44) de retard conçue pour retarder le signal (39) pendant une durée prédéterminée. La commande (33) de longueur d'onde permet de faire varier le premier signal d'entrée (35) de manière à assurer que les impulsions chevauchantes du signal (39) dans la boucle (41) de retard présentent des longueurs d'onde différentes, ce qui permet d'inhiber des effets de mélange optique entre impulsions chevauchantes.

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