Patent ID: 7555223

Claim:
A UWB (Ultra-Wide Band) signal generator comprising: a laser light source for generating a laser light; an optical intensity modulator for modulating an intensity of the laser light from the laser light source; a signal source of the optical intensity modulator for outputting a signal transmitted to the optical intensity modulator; an optical frequency shift keying (optical FSK) modulator to which output light from the optical intensity modulator is input, the optical FSK modulator comprising a main Mach-Zehnder waveguide (MZ C ), the MZ C comprising a first sub Mach-Zehnder waveguide (MZ A ) and a second sub Mach-Zehnder waveguide (MZ B ), the MZ C comprising an optical input unit which is connected to the MZ A and the MZ B , the MZ C comprising an output unit for modulated light, the output unit being connected to the MZ A and the MZ B , the MZ A comprising a first radio-frequency electrode (RF A electrode), the RF A electrode being used for inputting a radio frequency (RF) signal to two arms constituting the MZ A , the MZ B comprising a second radio-frequency electrode (RF B electrode), the RF B electrode being used for inputting a radio-frequency (RF) signal to two arms constituting the MZ B , the MZ C comprising a third radio-frequency electrode (RF C electrode), the RF C electrode being used for shifting an output frequency of the light from the output of the optical FSK modulator by adjusting the bias voltage of the RF C electrode; a signal source for controlling a signal transmitted to the RF C electrode of the optical FSK modulator; a high-frequency electric signal source for controlling a signal transmitted to the RF A electrode and the RF B electrode of the optical FSK modulator; and a high-speed photodetector for detecting an output from the optical FSK modulator.