| 摘要 |
Light with a single wavelength is generated from a light source 1. Optical phase modulators 2-4 are connected to the light source 1 in series. The optical phase modulators 2-4 modulate an optical phase in accordance with an electrical signal externally inserted. The phase modulation is performed so that the phase is shifted by 0.5pi with respect to a predetermined reference phase for each bit of a transmission data signal. Optical intensity modulators 5, 6 are connected to each other in series at a subsequent stage of the optical phase modulator 4. The optical intensity modulators 5, 6 modulate optical intensity in accordance with an electrical signal externally inserted.
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