Patent ID: 8547630
Filing Date: 2013-10-01
Classification: G02B,H01L,H01S

Abstract:
1. A manufacturing method for an optical semiconductor device, comprising: disposing a semiconductor element that has a polarization dependent gain or a polarization dependent loss between optical waveguide modes differing in a direction of polarization; positioning a lens at one end face side of the semiconductor element based on an optical coupling loss between the lens and the semiconductor element; repositioning the lens based on the polarization dependent gain or the polarization dependent loss of the semiconductor element, wherein a spot size at a beam waist position of the lens is smaller than a spot size in any of the optical waveguide modes in the semiconductor element, and the repositioning of the lens includes: inputting light in the optical waveguide modes differing in the direction of polarization to the semiconductor element; detecting light in the optical waveguide modes differing in the direction of polarization output from the semiconductor element through the lens; and carrying out positional adjustment by displacing the lens in an optical axis direction in such a manner that an amplitude of a temporal waveform of the power of the light detected through the lens approximately equals zero, wherein the light in the optical waveguide modes differing in the direction of polarization is polarization-scrambled light.