Patent ID: 6018541
Filing Date: 2000-01-25
Classification: H01S

Abstract:
A distributed feedback laser comprising:an optical waveguide divided into first and second waveguide sections along a dividing line normal to the length of the optical waveguide, there being a phase shift at an interface between said first and second waveguide sections so that said first waveguide section defines a gain-coupled diffraction grating structure when a first electric field is applied thereto and said second waveguide section defines a loss-coupled diffraction grating structure when a second electric field opposite to the first electric field is applied thereto, said gain-coupled diffraction grating structure having a distribution of energy gains at periodic intervals and said loss-coupled diffraction grating structure having a distribution of energy absorptions at said periodic intervals, one of said energy absorptions which is adjacent said dividing line being contiguous with one of said energy gains which is adjacent said dividing line;a first electrode for producing said first electric field in said first waveguide section; anda second electrode for producing said second electric field in said second waveguide section.