H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/06 (2006.01) G02B 5/28 (2006.01) H04B 10/158 (2006.01) H04J 14/02 (2006.01)
Patent
CA 2206945
An optical receiver board is disclosed. In the optical receiver board, a signal light is amplified in an optical fiber amplifier. The amplified signal light is supplied to an electrically driven optical wavelength-tuning filter such as a multi-layered film interference filter, through which a signal light of a predetermined wavelength bandwidth is transmitted. The transmitted signal light is divided into first and second signal lights. The first signal light is converted to an electric signal which is amplified by an equalizing amplifier, and an amplified electric signal is supplied to a discrimination circuit, in which an information electric signal is generated by using a timing signal. The optical wavelength-tuning filter comprises a rotation actuator having a magnet-rotating portion and control coils, and an optical filter member fixed to on the top of the magnet-rotating portion. In operation, the wavelength-tuning filter is swept by a sweep signal, so that an electric signal converted from a signal light transmitted through the optical wavelength-tuning filter becomes a predetermined value, and the tracking control is carried out to maximize a power of the transmitted signal light. The inclination angle of the optical filter member is changed by controlling currents flowing through the control coils of the actuator, so that a transmission center wavelength of the signal light is adjusted.
L'invention est une carte de réception optique sur laquelle est monté un amplificateur de signaux lumineux à fibre optique. Le signal lumineux amplifié est transmis à un filtre optique accordable à largeur de bande prédéterminé commandé électriquement, tel qu'un filtre antiparasite multicouche. Le signal lumineux transmis est divisé en un premier et un second signal. Le premier signal est converti en un signal électrique qui est amplifié par un amplificateur égaliseur dont le signal de sortie est transmis à un circuit discriminateur qui produit un signal d'information en utilisant un signal de chronométrage. Le filtre optique accordable comporte un actionneur rotatif contenant un aimant tournant et des bobines de commande, et un élément de filtrage optique monté sur l'aimant tournant. En mode de fonctionnement, le filtre optique accordable est balayé par un signal et le signal électrique obtenu à partir du signal lumineux transmis dans le filtre d'accord optique prend une valeur prédéterminée, la commande de poursuite étant effectuée de façon à maximiser la puissance du signal lumineux transmis. L'angle d'inclinaison de l'élément de filtrage optique varie sous l'effet des courants de commande qui traversent les bobines de commande de l'actionneur, ce qui ajuste la longueur d'onde centrale du signal lumineux transmis.
Koga Tadashi
Nakamura Takashi
Ogata Takaaki
Oguri Hitoshi
Corporation Nec
Smart & Biggar
Sumitomo Osaka Cement Co. Ltd.
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