Patent ID: 6160654
Filing Date: 2000-12-12
Classification: B82Y,G02F

Abstract:
An absorption type semiconductor optical modulator configured to receive an optical signal having a long wavelength region, the optical modulator comprising:a lower cladding doped semiconductor layer;a non-doped semiconductor layer including a semiconductor core layer having an interaction portion and an absorption peak wavelength, the non-doped semiconductor layer being located above the lower cladding doped semiconductor layer;an upper cladding doped semiconductor layer located above the non-doped semiconductor layer; anda travelling wave electrode disposed along the interaction portion of the semiconductor core layer above the upper cladding doped semiconductor layer and having an electrical signal input member and an electrical signal output member, the semiconductor core layer being configured such that the absorption peak thereof is shifted to the long wavelength region of the optical signal so as to directly absorb the optical signal when a voltage is applied to the traveling wave electrode.