Method and apparatus for generating frequency modulated pulses

Details Method and apparatus for generating frequency modulated pulses Method and apparatus for generating frequency modulated pulses

H - Electricity

01

S

H01S 3/00 (2006.01) H01S 5/062 (2006.01) H01S 5/0625 (2006.01) H04B 10/145 (2006.01) H04B 10/155 (2006.01) G02B 6/34 (2006.01) H01S 5/12 (2006.01) H01S 5/14 (2006.01)

Patent

CA 2404158

A method and apparatus are provided for generating short (e.g., picosecond) pulses using a 2 section 1553 nm DBR laser without gain switching nor external modulation. The center wavelength of the DBR section is modulated at 0.5 GHz to generate a constant amplitude frequency modulated optical wave. Large group velocity dispersion is then applied with a chirped fiber Bragg grating to convert the FM signal to a pulse stream.

L'invention concerne un procédé et un appareil destinés à produire des impulsions courtes (c'est à dire de l'ordre de la picoseconde) en utilisant un laser à deux sections à réseau de Bragg distribué (DBR) à 1553 nm sans commutation de gain ou de modulation extérieure. La longueur d'ondes centrale de la section DBR est modulée à 0,5 GHz afin de produire une onde optique modulée en fréquence et d'amplitude constante. On applique alors une dispersion de vitesse de groupe dense au moyen d'un réseau de Bragg à fibre comprimée afin de convertir le signal modulé en fréquence en un courant d'impulsions.

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