Optical receiver

H - Electricity – 04 – B

Patent

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Details

H04B 10/14 (2006.01) H04B 7/212 (2006.01) H04B 10/158 (2006.01)

Patent

CA 2067487

A network head-end station (1) is arranged to receive an upstream TDMA frame comprising interleaved optical signals from a plurality of terminations (2) connected to the head-end station (1) by a fibre network (3). The upstream TDMA frame includes a quiet phase during which none of the terminations transmit. The station (1) includes an opto-electronic receiver (4), a DC clamping circuit (10) for the opto-electronic receiver (4) and a clamping pulse generator. The clamping pulse generator is arranged to generate a pulse at a predetermined time falling within the quiet phase to operate the DC clamping circuit to clamp signals received during the remainder of the TDMA frame to a DC reference level received during the quiet phase.

Une station de tête de réseau (1) est installée de façon à recevoir une trame AMRT transmise par une liaison ascendante et comportant des signaux lumineux entrelacés provenant d'une pluralité de stations terminales (2) reliées à la station de tête (1) par un réseau de fibres (3). La trame AMRT en cause contient une phase durant laquelle toutes les stations terminales sont silencieuses. La station (1) comprend un récepteur optoélectronique (4), un circuit de calage à courant continu (10) utilisé par le récepteur optoélectronique (4) et un générateur d'impulsions de calage. Ce dernier est monté de façon à produire une impulsion à un instant prédéterminé durant la phase de silence pour déclencher le circuit de calage à courant continu afin de caler les signaux reçus durant le reste de la trame AMRT au niveau de référence de courant continu reçu durant la phase de silence.

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