| 摘要 |
An angle modulator having an excellent noise characteristic and an excellent distortion characteristic independent of an unwanted wave component of an optical modulation signal is provided. The angle modulator (10) includes an optical SSB modulation section (103a), an optical SSB-SC modulation section (104a), and an optical angle modulation section (105). By performing intensity modulation on an output signal of the optical SSB modulation section (103a) at the optical SSB-SC modulation section (104a), an unwanted angle modulated signal is prevented from overlapping with an angle modulated signal outputted from an optical detection section (107). Further, by a filter (108) filtering only an angle modulated signal component which does not include the unwanted wave component among the angle modulated signal components outputted from the optical detection section (107), a distortion characteristic after angle demodulation can be prevented from deteriorating. Thus, the angle modulator according to the present invention can output an angle modulated signal having an excellent noise characteristic and an excellent distortion characteristic.
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