Coherent light generators – Particular active media – Semiconductor
Patent
1998-12-15
2000-05-30
Font, Frank G.
Coherent light generators
Particular active media
Semiconductor
372 22, 372 96, 372102, 372 25, H01S 319, H01S 310, H01S 308
Patent
active
06069906&
ABSTRACT:
A compact source capable of generating continuously tunable high frequency microwave radiation and short optical pulses in the picosecond/sub-picosecond range 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 (gain-coupled or loss-coupled) grating which is formed by deep etching through a multi-quantum well structure, either of the active medium or of the additional lossy quantum-well layers, thus ensuring no substantial interaction between lasers. 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 at a difference frequency of two lasers. The beat frequency is defined by spacing between the laser modes and may be continuously tuned by current injection and/or temperature variation. Thus, the beat signal provides a continuously tunable microwave radiation. 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 which includes a dispersion fiber. As a result, a duration of each impulse is compressed, and a train of short optical pulses is formed.
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Hong Jin
Hui Rongqing
O'Sullivan Maurice S.
Font Frank G.
Nortel Networks Corporation
Rodriguez Armando
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