Optical angle modulator and optical transmission apparatus

An optical angle modulator comprising:

• a first generating unit configured to generate first angle-modulated light and second angle-modulated light by performing angle modulation on continuous light using an electrical signal;
• and
• a second generating unit configured to generate third angle-modulated light by causing partially degenerate four-wave mixing of the first angle-modulated light and the second angle-modulated light,
• wherein a frequency band of the first angle-modulated light and a frequency band of the second angle-modulated light are different from each other, and
• an angle of the second angle-modulated light decreases due to the electrical signal while an angle of the first angle-modulated light is increasing due to the electrical signal, and the angle of the second angle-modulated light increases due to the electrical signal while the angle of the first angle-modulated light is decreasing due to the electrical signal.