Buried heterostructure or BH laser with tapered optical waveguide, especially BH-distributed feedback laser, has effective diffraction grid period for optical wave adapted to local refractive index profile

摘要

The device consists of a buried optical waveguide (1) with in-built active layer (2) on a substrate and an integrated diffraction grid. The diffraction grid has a constant grid period and the waveguide is curved so that the effective grid period of the diffraction grid for the optical wave passing through it is adapted to the local refractive index profile according to a relationship between the effective grid period, emission wavelength and refractive index.