Frequency tunable terahertz transceivers and method of manufacturing dual wavelength laser

A frequency tunable terahertz transceiver comprising:

• a dual wavelength laser including two distributed feedback lasers that are manufactured in one substrate and output optical signals of respectively different wavelengths;
• an optical device receiving the outputted optical signals to generate a terahertz wave or detecting a terahertz wave inputted from the external;
• and
• an analog to digital converter converting the terahertz wave detected from the optical device into a digital signal.

A method of manufacturing a frequency tunable terahertz transceiver including two separate distributed feedback lasers that are manufactured in one substrate, the method comprising:

• forming a lower clad layer on the substrate, interposing a lower diffraction grating layer between the lower clad layers, forming an active layer on the lower clad layer, forming an upper clad layer on the active layer, and interposing an upper diffraction grating layer between the upper clad layers;
• manufacturing a diffraction grating by etching the lower diffraction grating layer and the lower diffraction grating layer;
• integrating the active layer into a passive waveguide;
• and
• forming an electrode on the upper clad layer.