Patent ID: 9013785
Filing Date: 2015-04-21
Classification: H01S

Abstract:
1. A widely tunable multi-mode semiconductor laser containing only two electrically active sections, being an optical gain section and a tunable distributed Bragg reflector section that reflects at a plurality of wavelengths, wherein the gain section is bounded by the tunable distributed Bragg reflector section and a broadband facet reflector, and wherein the tunable distributed Bragg reflector section comprises at least three discrete segments that are selectively tuned, and the discrete segments have respective portions of grating that have different pitches in a passive state, and wherein the reflection spectra of one or more segments of the tunable distributed Bragg reflector section is tuned lower in wavelength to correspond with the reflection spectrum of a further segment of the tunable distributed Bragg reflector section to provide a wavelength range of enhanced reflectivity.