Generation of short optical pulses using strongly complex...

Details Generation of short optical pulses using strongly complex... Generation of short optical pulses using strongly complex...

H - Electricity

01

S

H01S 5/12 (2006.01) H01S 5/00 (2006.01) H01S 5/026 (2006.01) H01S 5/062 (2006.01) H01S 5/10 (2006.01)

Patent

CA 2315412

A compact source capable of generating continuously tunable high frequency microwave radiation and short optical pulses is invented. It includes a laser structure having two lasers formed on the same substrate which simultaneously operate at different longitudinal modes. Each laser has a complex coupled grating. The lasers have a common active medium and shared optical path and provide mutual light injection into each other which results in generation of a beat signal. The beat frequency is defined by spacing between the laser modes and may be continuously tuned by current injection and/or temperature variation. To form a train of short optical pulses, the beat signal is either further sent to a saturable absorber followed by a semiconductor optical amplifier, or sent directly into an optical compressor. An embodiment where N short pulse optical trains, each at frequency f, are combined so as to interleave and form one short pulse optical train at frequency Nf, is also provided.

L'invention concerne une source compacte capable de générer des micro-ondes haute fréquence à réglage continu et des impulsions optiques courtes. Cette source comprend une structure laser composée de deux lasers disposés sur le même substrat, lesquels fonctionnent simultanément à des modes longitudinaux différents. Chacun de ces lasers comprend un réseau couplé complexe. Par ailleurs, ces lasers possèdent un support actif et un trajet optique communs et ils s'injectent mutuellement de la lumière, produisant ainsi un signal de battement. La fréquence de battement est définie par l'espacement séparant les modes laser et peut être réglée continuellement par injection de courant et/ou par variation de température. Afin de créer un train d'impulsions optiques courtes, le signal de battement est soit retransmis à un absorbeur saturable suivi d'un amplificateur optique semi-conducteur, soit il est transmis directement à un compresseur optique. Dans un mode de réalisation, des trains optiques à N impulsions sont combinés, chacun à une fréquence f, de sorte qu'ils s'imbriquent et forment un train optique à impulsions courte à une fréquence Nf.

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