A transmitter circuit comprising a light source and a...

H - Electricity – 04 – B

Patent

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H04B 10/155 (2006.01)

Patent

CA 2423473

The invention concerns a transmitter circuit comprising a light source (20) and arranged to operate said light source (20) to transmit optical communication signals in response to balanced electric input signals from a first (11) and a second (12) circuit point. The transmitter circuit comprises a first (21) and a second (22) circuit branch which extend from said first (11) and second (12) points, respectively. The light source (20) is connected between the circuit branches (21, 22). The components which are positioned on the circuit branches (21, 22) are selected such that the transmitter circuit is formed with a symmetry which is such that, under normal operation conditions, a balanced drive voltage is the case between the connection points (13, 15) of the light source (20) on the circuit branches (21, 22) and such that the modulation current which drives the light source (20) essentially only depends on the voltage difference between said connection points (13, 15). The invention also concerns a communication system which comprises such a transmitter circuit.

L'invention concerne un circuit de transmission comprenant une source lumineuse (20) et configuré pour faire fonctionner cette dernière de sorte qu'elle émette des signaux de communication optiques en réaction à des signaux d'entrée électriques équilibrés provenant d'un premier (11) et d'un deuxième point de circuit (12). Ce circuit de transmission comprend une première (11) et une deuxième branche de circuit (22) qui s'étendent respectivement à partir du premier (11) et du deuxième point de circuit (12). La source lumineuse (20) est connectée entre les branches du circuit (21, 22). Les composants positionnés sur les branches du circuit (21, 22) sont sélectionnés de sorte que le circuit de transmission soit formé avec une symétrie telle que, dans des conditions normales de fonctionnement, une tension de commande équilibrée soit présente entre les points de connexion (13, 15) de la source lumineuse (20) sur les branches du circuit (21, 22) et de sorte que le courant de modulation qui commande la source lumineuse (20) ne dépende sensiblement que de la différence de tension entre lesdits points de connexion (13, 15). L'invention concerne également un système de communication qui comprend un tel circuit de transmission.

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