SYSTEM FOR DISTRIBUTING POWER AND COMMUNICATION SIGNALS IN OPTICAL FIBRE ACCESS NETWORKS

The present invention relates to a system for distributing power and communication signals in optical fibre access networks using optical boxes, including an optical box bus containing three optical splitter boxes (10) connected in sequence and one termination box (12). The first optical splitter box (10) receives a distribution or splitter cable (CD) formed by a single optical fibre, providing a given optical input power, said optical splitter box (10) having an input splitter (DE) to effect the unbalanced splitting of the optical input power received in the optical box (10) of the bus into two portions. A first portion of the optical input power is conveyed to an output splitter (DS), the output splitter (DS) splitting the first portion of the optical power into optical powers that are selectively transferred to respective user terminal optical cables (CT). A second portion of the optical input power is conveyed to the second optical box (10) of the bus over a continuation cable (CC) formed by a single optical fibre, and so on until said optical termination box (12) is reached, where the optical input power is fully available to the user terminal optical cables (CT). The splitting ratio of the input splitters (DE) of each one of the three optical splitter boxes (10) varies between 70/30 and 90/10, the number before the slash being the percentage of the power conveyed to the next optical box (10, 12) of the system and the number after the slash being the percentage of the power conveyed to the output splitter (DS) and to the access cables (drop). Sistema de distribución de señales de comunicación y potencia en redes de acceso de fibra óptica. El sistema comprende un barraje de caja óptica con tres cajas ópticas de derivación (10) conectadas en secuencia y una caja de terminación (12). La primera caja óptica (10) recibe un cable de distribución (CD) formado por una fibra óptica que proporciona una potencia óptica de entrada, y tiene un divisor de entrada (DE) para dividir, de manera desequilibrada, la potencia óptica de entrada en dos partes. Una primera parte de la potencia óptica de entrada se envía a un divisor de salida (DS) que divide la primera parte de la potencia óptica en potencias que se transfieren a cables ópticos terminales (CT) del usuario. Una segunda parte de la potencia óptica de entrada es conducida a la segunda caja óptica (10) del barraje mediante un cable de continuación (CC) hasta llegar a dicha caja de terminación óptica (12).