DEVICE FOR GENERATING AND DETECTING PHOTO MIXING-TYPE CONTINUOUS-WAVE TERAHERTZ USING PHASE NOISE COMPENSATION METHOD

摘要

An embodiment of the present invention provides a continuous-wave terahertz generation and detection device using a photomixing technique, the device including: first and second light source units configured to output continuous-wave laser light sources, which have single wavelength and different frequencies, to generate optical signals; a first electro-optic phase modulator configured to shift a frequency of the optical signal generated by the first light source unit, and a second electro-optic phase modulator configured to shift a frequency of the optical signal generated by the second light source unit; a first optical amplifier configured to receive and amplify the optical signal whose frequency is shifted by the first electro-optic phase modulator and the optical signal generated by the second light source unit, and a second optical amplifier configured to receive and amplify the optical signal whose frequency is shifted by the second electro-optic phase modulator and the optical signal generated by the first light source unit; an opto-electronic converter configured to convert the optical signal amplified by the first optical amplifier into a terahertz wave; a photomixer configured to mix the optical signal amplified by the second optical amplifier and the terahertz wave generated by the opto-electronic converter and convert the mixed signal into an electrical signal; a photodetector configured to combine the optical signals transferred from the first and second optical amplifiers and convert the combined optical signal into an electrical signal; and a filter unit configured to filter the electrical signal passing through the photodetector, wherein the electrical signal obtained through the photodetector is compared with the electrical signal obtained by the photomixer, and phase noise having the same frequency is removed.