Optical networks

Details Optical networks Optical networks

H - Electricity

04

N

H04N 7/22 (2006.01) H04J 14/02 (2006.01)

Patent

CA 2057881

A system for distributing HDTV signals from a head station (1) to a number of customer stations (3) includes a single head-end optical source (4) having a frequency f0 and a modulator (5) arranged to receive light from the single optical source (4). The modulator (5) modulates the light with a sub-carrier multiplex of n channels, where n is an integer greater than 2, the n channels having frequencies f1, f2...fn. The frequencies are separated in frequency-space from each other and from f0. A broadband passive branched optical network (2) is connected to the output of the modulator (5) and arranged to distribute the modulated signal from the head station (1) to a plurality of customer stations (3) each having a coherent heterodyne receiver (7, 8, 9, 16).

Un système de diffusion des signaux HDTV par une station de tête (1) à un nombre de stations de consommateur (3) comprend une source optique de tête dont la fréquence est f0 et un modulateur (5) monté afin de recevoir la lumière d'une seule source optique (4). Le modulateur (5) module la lumière avec un multiplexeur de sous-porteuses à n voies, où n est un entier supérieur à 2, le n voies ayant les fréquences f1, f2... fn. Les fréquences sont distinctes dans l'espace de fréquences l'une de l'autre et de f0. Un réseau optique à branches passives de large bande (2) est connecté à la sortie du modulateur (5) et monté pour diffuser le signal modulé de la station de tête (1) à plusieurs stations de consommateur (3) chacune ayant un récepteur hétérodyne cohérent (7, 8, 9, 16).

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