Dark pulse generation

H - Electricity – 01 – S

Patent

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H01S 3/098 (2006.01) H01S 3/06 (2006.01) H01S 3/067 (2006.01) H01S 3/16 (2006.01)

Patent

CA 2198121

An optical pulse generator comprises a FM mode locked laser that is configured to produce dark optical pulses. The laser comprises a cavity (M1, M2) and a Pr3+ doped fluoride fibre (3) pumped by a source (1). The output is mode locked by a phase modulator comprising a silica fibre (2) in the cavity that receives modulating pulses from a DFB laser (7), so as to alter the refractive index of the fibre (2) and cross phase modulate the laser light. The phase modulation combines with the dispersive effect of the fibre (3) to produce dark output pulses.

Générateur d'impulsions optiques comprenant un laser à modes synchronisés F.M. conçu pour produire des impulsions optiques sombres. Ce laser comprend une cavité (M1, M2) ainsi qu'une fibre (3) de fluorure dopée au Pr?3+¿ et pompée par une source (1). Le rendement est synchronisé en mode par un modulateur de phase comprenant une fibre (2) de dioxyde de silicium placée dans la cavité et qui reçoit les impulsions de modulation à partir d'un laser (7) à rétroaction répartie (DFB), de manière à modifier l'indice de réfraction de la fibre (2) et à moduler en phase croisée la lumière du laser. La modulation de phase se combine à l'effet dispersif de la fibre (3) pour produire des impulsions de sortie sombres.

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