Patent ID: 7760782
Filing Date: 2010-07-20
Classification: H01S

Abstract:
1. A distributed Bragg reflector type directly modulated surface emitting laser comprising: an active layer region whose length falls within a range of 10 to 100 μm provided on a semiconductor substrate; and a distributed Bragg reflector (DBR) layer connected to at least one side of the active layer region, wherein the active layer region is a current injection region and the distributed Bragg reflector (DBR) layer is a non-current injection region; wherein a laser cavity is comprised of the active layer region being an optical waveguide and the distributed Bragg reflector (DBR) layer being an optical waveguide; wherein a laser beam signal is generated by injecting a current into the active layer region; wherein the laser is a single lateral mode directly modulated laser; and wherein a laser cavity includes a laser emission end portion including a 45° angled mirror adjacent the DBR layer, on an opposite side of the DBR layer from the active region for changing a direction of emission of light power from an extending direction of the laser cavity to a direction toward one of surfaces of the semiconductor substrate, and further include a back side end portion formed by a cleavage method, said back side end portion being formed adjacent the active layer on an opposite side of the active layer from the DBR layer.