Patent ID: 7409113
Filing Date: 2008-08-05
Classification: B82Y,G02F

Abstract:
1. An optical transmitter module comprising: a semiconductor laser device; a semiconductor electro-absorption optical modulator in which an optical waveguide composed of a multi-layered film is formed on a substrate, an electrical signal is applied to said optical waveguide in a direction vertical to said substrate, and the absorption amount of input light is changed to control the amount of light to be outputted; and a modulator driving unit applying an electrical signal to said semiconductor electro-absorption optical modulator, wherein said semiconductor electro-absorption optical modulator includes a plurality of electrodes electrically separated from each other, which are arranged on an optical axis of said optical waveguide and apply an electrical signal to said optical waveguide, and said modulator driving unit includes a switching circuit which increases or decreases the number of electrodes for applying an electric field to an active layer waveguide of said semiconductor electro-absorption optical modulator in accordance with temperature.