The method to generate THz signals based on optical frequency multiplication

To solve the frequency stability and accuracy of THz wave that generated based on silicon waveguide, it raises another method which based on the optical frequency multiplier. The multiplier is composed of optical comb signal generator, optical tunable filters, and UTC-PD optical mixer. The two-mode coherent light signal is generated by multiplying optical comb signal and the adjustable optical fiber, and then it goes to UTC-PD for optical heterodyne mixer and finally to generate THz wave of high frequency and high saturation output power. It also evaluates the linewidth, single side-band phase noise and spurious signal suppression ratio. THz wave output signal frequency is locked on the external frequency standard and it can be continuously adjusted in the range of 100 GHz to 1THz. The generated THz wave signal has a characteristic of narrow linewidth, fast frequency control and high tunable resolution.