Patent ID: 8265112
Filing Date: 2012-09-11
Classification: H01S

Abstract:
1. A distributed feedback (DFB) laser, comprising: a waveguide including an active region, with a grating in or about the waveguide, the waveguide having a longitudinal length in a direction between a front facet and a rear facet, the waveguide being generally about layers forming a p-n junction, and an anode electrical contact and a cathode electrical contact; with at least one of the anode electrical contact and the cathode electrical contact having a longitudinal length in the direction between the front facet and the rear facet less than the longitudinal length of the active region; wherein the at least one of the anode electrical contact and the cathode electrical contact having a longitudinal length in the direction between the front facet and the rear facet less than the longitudinal length of the active region extends along a front portion of the longitudinal length, the front portion being towards the front facet; wherein the at least one of the anode electrical contact and the cathode electrical contact having a longitudinal length in the direction between the front facet and the rear facet less than the longitudinal length of the active region is the anode electrical contact; and further comprising a further anode electrical contact, the further anode electrical contact having a longitudinal length in the direction between the front facet and the rear facet less than the longitudinal length of the active region, with the further anode electrical contact extending along a rear portion of the longitudinal length, the rear portion being towards the rear facet.