Square optical pulse generator

Details Square optical pulse generator Square optical pulse generator

H - Electricity

01

S

H01S 3/00 (2006.01) G01C 19/66 (2006.01) G02B 6/28 (2006.01) G02F 1/35 (2006.01)

Patent

CA 2066259

An all-optical fibre Sagnac antiresonant interferometer (2) is formed from an optical fibre having a non-linear refractive index. The coupler (8) is a dichroic coupler coupling equal portions of a cw optical signal at 1.53 µm from laser (16) to ports (14 and 16) and all of a pulsed optical signal from laser (20) to port (14). The intensity of the pulsed optical signal is sufficient to provide a relative phase shift in the counter propagating 1.53 µm signals. The loop (6) is longer than the inverse of the absolute difference in group delays of the cw and pulsed optical so causing a square optical pulse at 1.53 µm to be switched to port (12) of the coupler.

Un interféromètre antirésonnant Sagnac à fibre tout optique (2) est formé à partir d'une fibre optique possédant un indice de réfraction non linéaire. Le coupleur (8) est un coupleur dichroïque couplant des parties égales d'un signal optique à onde entretenue de 1,53 µm d'un laser (16) aux ports (14 et 16) et la totalité d'un signal optique pulsé d'un laser (20) au port (14). L'intensité du signal optique pulsé est suffisante pour donner un déphasage relatif des signaux de rétropropagation de 1,53 µm. La boucle (6) est plus longue que l'inverse de la différence absolue des temps de propagation de groupe du signal optique à onde entretenue et du signal optique pulsé, causant ainsi la commutation d'une impulsion optique carrée de 1,53 µm au port (12) du coupleur.

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