PHOTOMIXING-BASED CW TERAHERTZ GENERATION AND DETECTION APPARATUS UTILIZING THE PHASE NOISE COMPENSATION METHOD

摘要

An embodiment of the present invention relates to a device for generating and detecting continuous-wave terahertz using a photo mixing technique, which comprises: first and second light source units that output continuous-wave laser light sources, having a single wavelength and different frequencies, in order to generate optical signals; a first optoelectronic phase modulator that shifts the frequency of the optical signal generated by the first light source unit, and a second optoelectronic phase modulator that shifts the frequency of the optical signal generated by the second light source unit; a first optical amplifier that receives and amplifies the optical signal frequency-shifted by the first optoelectronic modulator and the optical signal generated by the second light source unit, and a second optical amplifier that receives and amplifies the optical signal frequency-shifted by the second optoelectronic modulator and the optical signal generated by the first light source unit; a photoelectric converter that converts the optical signal amplified by the first optical amplifier into a terahertz wave; a photo-mixer that receives the optical signal amplified by the second optical amplifier and converts the terahertz wave generated by the photoelectric converter into an electrical signal by means of photo mixing; a photo-detector that couples the optical signals transmitted by the first and second optical amplifiers; and a filter unit that filters the electrical signal generated via the photo-detector, wherein an electrical signal delivered through a pre-amplifier is compared to the electrical signal delivered through the photo-detector and a band pass filter so that phase noise having the same frequency is removed.