Receiver for optical burst signal and receiving method therefor

H - Electricity – 04 – B

Patent

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H04B 10/06 (2006.01) H04B 10/158 (2006.01)

Patent

CA 2214946

16 There is disclosed an optical receiver and an optical receiving method for receiving optical burst signals. The optical receiver comprises a light receiving element, an automatic threshold level control circuit for identifying an electrical signal output from the light receiving element and outputting an identification signal, a limiter circuit for outputting the identification signal as a digital signal, and offset optical signal generator means for generating an offset optical signal based on the reset signal input into the automatic threshold level control circuit and inputting it into the light receiving element. The optical receiving method inputs a reset signal between optical burst signals, and inputs an offset signal between the optical burst signals after the reset signal. According to the present invention, the sensitivity is not deteriorated because a noise signal is not output in no signal state between the burst optical signals, and the duty ratio does not vary regardless of the light receiving level.

L'invention est constituée par un appareil et une méthode de réception de salves de signaux lumineux. Le récepteur optique de l'invention comporte un élément photorécepteur, un circuit de commande automatique de seuil servant à reconnaître les signaux électriques de sortie de l'élément photorécepteur et à produire des signaux d'identification, un circuit limiteur servant à reproduire ces signaux d'identification sous la forme de signaux numériques, et un générateur qui utilise le signal de réinitialisation introduit dans le circuit de commande automatique de seuil pour produire un signal lumineux décalé et l'introduire dans l'élément photorécepteur. Dans la méthode de réception optique de l'invention, un signal de réinitialisation est introduit entre les salves de signaux lumineux et un signal décalé est introduit entre les salves de signaux lumineux après le signal de réinitialisation. D'après la présente invention, la sensibilité n'est pas dégradée parce qu'aucun bruit n'est produit entre les salves de signaux lumineux et que le rapport cyclique ne varie pas indépendamment du niveau de la lumière reçue.

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