Optical transmission system, optical receiver, and its gain...

H - Electricity – 04 – B

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H04B 10/12 (2006.01) H03G 3/20 (2006.01) H04B 7/005 (2006.01) H04B 10/14 (2006.01) H04B 10/16 (2006.01) H04B 1/04 (2006.01)

Patent

CA 2590963

An optical transmission system comprises master unit and remote unit, the master unit includes optical transmitter transmits the optical signal to the optical fiber at a fixed averaged output level, the remote unit includes optical receiver receives optical signal via optical fiber, and optical receiver includes light receiving element converts optical signal into electric signal, variable gain amplifier amplifies the electric signal at a gain corresponding to a value of a given adjustment voltage, gain controller supplied power for a defined control period, controls the adjustment voltage to stabilize an averaged level of the electric signal to a defined value, and feed-forward-controls a gain of variable gain amplifier, a shut off unit shuts off supply of power to the gain control circuit when the control period ends, and a keeping unit keeps a value of an adjustment voltage applied to the variable gain amplifier.

Système de transmission optique comprenant un bloc principal et un bloc à distance, le bloc principal comprenant un transmetteur de signal optique vers une fibre optique à un niveau de sortie moyen fixe, le bloc à distance comprenant un récepteur optique qui reçoit le signal optique par une fibre optique, le récepteur optique comportant un élément de réception de la lumière qui convertit le signal optique en un signal électrique, un amplificateur à gain variable qui amplifie le signal électrique à un gain correspondant à la valeur d'une tension de réglage prédéterminée, le contrôleur de gain recevant du courant pendant une période de contrôle déterminée; l'amplificateur règle la tension de façon à stabiliser un niveau moyen du signal électrique à une valeur définie et à assurer la régulation avec régénération un gain de l'amplificateur à gain variable; un interrupteur maintient la valeur d'une tension de réglage appliquée à l'amplificateur à gain variable.

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