H - Electricity – 01 – S
Patent
H - Electricity
01
S
H01S 3/10 (2006.01) H01S 5/00 (2006.01) H01S 5/062 (2006.01) H01S 5/06 (2006.01) H01S 5/10 (2006.01)
Patent
CA 2143051
Ultra-short transform-limited optical pulses, to be utilized for high bit-rate transmission systems, are obtained through direct modulation of a semiconductor laser by means of pulses of such a duration as to excite only the first peak of the relaxation oscillations of the cavity of laser, tuned to such a length that the pulse portions that overlap inside the cavity interfere constructively. The pulses emitted by the laser are then made to pass in a fibre with high negative dispersion to compensate for the phase effect due to the chirp.
Des impulsions lumineuses ultrabrèves limitées par transformation, qui doivent être utilisées dans des systèmes de transmission à débit binaire élevé, sont obtenues par une modulation directe d'un laser à semi-conducteur au moyen d'impulsions de durée appropriée pour n'exciter que le premier pic des oscillations de relaxation de la cavité du laser, laquelle est accordée à une longueur telle que les parties des impulsions en chevauchement à l'intérieur produisent des interférences constructives. Les impulsions émises par le laser sont ensuite transmises à une fibre à dispersion négative élevée qui compense le déphasage résultant de la modulation.
Calvani Riccardo
Caponi Renato
Cisternino Francesco
Roccato Diego
Agilent Technologies Inc.
Ridout & Maybee Llp
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