Patent ID: 7382817
Filing Date: 2008-06-03
Classification: H01S

Abstract:
1. A semiconductor laser comprising: a first optical cavity comprising a first optical waveguide bounded by two partially reflecting elements, at least a portion of said first optical waveguide being pumped to provide optical gain, a second optical cavity comprising a second optical waveguide bounded by two partially reflecting elements, at least a portion of said second optical waveguide being pumped to provide optical gain, whereas the first and the second optical waveguides have different optical path lengths, and are disposed side-by-side on a substrate to form substantially V-shaped waveguide branches with substantially no cross-coupling at the open end and a predetermined cross-coupling at the closed end, whereas the cross-coupling coefficient between the first and the second waveguides at the closed end is substantially less than the self-coupling coefficients of the first and the second waveguides for achieving an optimal single-mode selectivity of the laser.