Patent ID: 7831155
Filing Date: 2010-11-09
Classification: H04B

Abstract:
1. An optical transmission device, comprising: a light source for outputting an optical carrier; a signal generating section for outputting an electric signal; an electric signal branching section for branching the electric signal outputted from the signal generating section into two electric signals having a predetermined phase difference therebetween; an amplitude adjusting section for receiving at least one of the two electric signals outputted from the electric signal branching section and adjusting an amplitude of the received electric signal; and an optical modulation section with suppressed sideband component, including an optical waveguide branching into two routes of optical waveguide at an input end and merging together at an output end, for outputting an optical intensity-modulated signal from the output end, wherein: if both of the two electric signals are inputted to the amplitude adjusting section, the optical modulation section modulates optical carriers passing through the two routes of optical waveguide with two amplitude-adjusted electric signals inputted via the amplitude adjusting section, and if one of the two electric signals is inputted to the amplitude adjusting section, the optical modulation section modulates optical carriers passing through the two routes of optical waveguide with an amplitude-adjusted electric signal inputted via the amplitude adjusting section and an amplitude-unadjusted electric signal inputted from the electric signal branching section without passing through the amplitude adjusting section; and if the optical modulation section cannot evenly branch an intensity of the optical carrier into the two routes of optical waveguide, the amplitude adjusting section adjusts an amplitude of the received electric signal so that an unnecessary sideband component of the optical intensity-modulated signal outputted from the optical modulation section disappears.