Optical transmitter and optical transmission system...

H - Electricity – 01 – S

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H01S 3/10 (2006.01) H01S 3/067 (2006.01) H01S 5/0687 (2006.01) H04B 10/18 (2006.01)

Patent

CA 2372080

An optical transmitter having a structure capable of effectively suppressing nonlinear optical phenomena, especially the SBS and outputting high-power signal light. The transmitter comprises a modulated signal source for outputting modulated signal light modulated with a frequency of 20 kHz or less, a semiconductor laser light source for outputting laser light the amplitude of which is modulated with the modulated signal from the modulated signal source, an optical amplifier for amplifying the laser light from the semiconductor laser source, and a modulation coefficient adjusting system for adjusting the ratio of the amplitude modulation coefficient of the laser light from the semiconductor laser light source to the amplitude modulation coefficient of the amplified laser light outputted from the optical amplifier. Specifically, the modulation coefficient adjusting system adjusts the modulation coefficient of the amplified laser light to 60% or less of the modulation coefficient of the laser light inputted to the optical amplifier. An optical transmission system comprising such an optical transmitter is also disclosed.

L'invention concerne un émetteur optique dont la structure permet de supprimer efficacement les phénomènes optiques non linéaires, notamment la diffusion de Brillouin stimulée, et d'émettre en sortie un signal lumineux de puissance élevée. L'émetteur comprend une source de signaux modulés, qui émet en sortie un signal lumineux modulé à une fréquence de 20 kHz ou moins; une source de lumière laser à semi-conducteur, qui émet en sortie une lumière laser dont l'amplitude est modulée par le signal modulé provenant de la source de signaux modulés; un amplificateur optique, qui amplifie la lumière laser provenant de la source laser à semi-conducteur; et un système de réglage du coefficient de modulation, qui règle le rapport du coefficient de modulation d'amplitude de la lumière laser provenant de la source de lumière laser sur le coefficient de modulation d'amplitude de la lumière laser amplifiée émise par l'amplificateur optique. Le système de réglage du coefficient de modulation règle le coefficient de modulation de la lumière laser amplifiée sur 60 % ou moins du coefficient de modulation de la lumière laser entrée dans l'amplificateur. L'invention concerne également un système de transmission optique comprenant ledit émetteur optique.

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