| 摘要 |
The invention provides an optical sending apparatus which improves the characteristics near zero dispersion without sacrificing the characteristics at high dispersion in an optical duo binary scheme. The apparatus comprises an optical modulation sending unit, a driving signal processing unit, and a modulation operation switch-over unit for switching over the modulation operation so as to switch over the modulation waveform modulated in intensity in the optical modulation sending unit, in either a first modulation waveform in which the intensity of modulated light to the median value of the duo binary signal is minimum and the intensity of modulated light to other two values of the duo binary signal is maximum, and a second modulation waveform in which the intensity of modulated light to the median value of the duo binary signal is maximum and the intensity of modulated light to other two values of the duo binary signal is minimum.
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