Optical analog/digital converting method and apparatus

G - Physics – 02 – F

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G02F 7/00 (2006.01)

Patent

CA 2606167

A simple structure is used to achieve a high-rate optical analog/digital conversion. There are included an optical pulse branching/delaying/multiplexing unit (40), an optical encoder (60) and an optical threshold value processor (70). The unit (40) branches each of optical pulse sequences (S11), which is obtained by sampling an input optical analog signal (Sin), to generate the same number of replicas of optical pulses as a predetermined number of bits. The unit (40) then imparts a predetermined intensity difference and a predetermined time difference to each of the replicas of optical pulses and multiplexes them to generate and output a sequence of temporally successive optical pulses. The combination of optical encoder (60) and optical threshold value processor (70) encodes and quantizes the optical pulse sequence (S12) to output an optical digital signal (Sout) corresponding to the optical analog signal (Sin).

L~invention prévoit l~utilisation d~une structure simple pour réaliser une conversion analogique/numérique à une vitesse élevée. Le dispositif inclut une unité de branchement/retard/multiplexage (40) d~impulsions optiques, un encodeur optique (60) et un processeur de valeur de seuil optique (70). L~unité (40) fait bifurquer chacune des séquences d~impulsions optiques (S11), ce qui est obtenu en échantillonnant un signal analogique optique d~entrée (Sin), afin de générer le même nombre de répliques d~impulsions optiques qu~un nombre prédéterminé de bits. L~unité (40) transmet ensuite une différence d~intensité prédéterminée et une différence temporelle prédéterminée à chacune des répliques d~impulsions optiques et les multiplexe pour générer et fournir une séquence d~impulsions optiques successives dans le temps. La combinaison de l~encodeur optique (60) et du processeur de valeur de seuil optique (70) code et quantifie la séquence d~impulsions optiques (S12) pour fournir un signal numérique optique (Sout) correspondant au signal analogique optique (Sin).

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