Patent ID: 6909734
Filing Date: 2005-06-21
Classification: B82Y,H01S,H04B

Abstract:
1. A tunable laser comprising: a waveguide for guiding a light beam, the waveguide including a separate-confinement-heterostructure (SCH) having an energy bandgap that is sufficiently low to provide gain to the light beam; a front minor defining an end of a cavity within the waveguide; a back mirror defining an opposite end of the cavity within the waveguide; the cavity within the waveguide including: wherein reflectivities of the front mirror and the back mirror and the center frequency of the phase section are tuned to be substantially coincident such that the light beam exits the cavity and wherein additional gain for the light beam is provided by at least one of the phase section, the front mirror and the back mirror in order to partially compensate for losses associated with tuning.