Patent ID: 7039075
Filing Date: 2006-05-02
Classification: H01S

Abstract:
1. A laser device, comprising: a vertical cavity, surface emitting laser (VCSEL) section comprising a Bragg reflector, a first gain region and an intracavity reflector formed over a substrate, said VCSEL section having small gain per pass through the first gain region and forming a first resonant cavity between the Bragg reflector and the intracavity reflector, an extended cavity section comprising an optical fiber of predetermined length, and having first and second ends, the first end of the optical fiber being optically coupled to the first gain region, wherein said extended cavity section exhibits optical losses comparable to or larger in magnitude to said small gain per pass through said first active region, an output coupler/reflector optically coupled to the second end of the extended cavity section, forming a second resonant cavity between the Bragg reflector and the output coupler/reflector; said intracavity reflector resulting in insufficient effective reflective magnitude, R said intracavity reflector resulting in sufficient effective reflective magnitude, R said intracavity reflector further being chosen, in combination with said optical fiber predetermined length, such that single longitudinal mode operation is achieved in said first and second resonant cavities; and the effective reflective magnitude, R where r eff is the effective reflectivity amplitude of said intracavity reflectivity or said output coupler/reflector and R eff is the effective reflective magnitude of said intracavity reflectivity or said output coupler/reflector and r 2 and r 2 are respectively the reflective amplitude of said intracavity reflector and the output coupler/reflector.