An apparatus embedded with one or more terahertz transceivers is described. The one or more terahertz transceivers based on at least Gunn diode are provided to facilitate wireless communication in the apparatus, where the apparatus is embedded with one or more planar antennas. The transceiver operates in terahertz and may be coupled to one or two different antennas, one for transmission and the other for reception.

Disclosed is a system and method of combining optical interference cancellation with other methods of interference cancellation, including electronic cancellation, digital filtering, and beam steering algorithms, to remove co-located interference, remote interference of an unknown origin, and multipath interference components created by reflections of signals both known and unknown.

Techniques for using one or more terahertz transceivers in wearable display glasses for bio-sensing are described. The one or more terahertz transceivers operate signals in Terahertz and configured as transmitters or receivers. When disposed collaboratively on a pair of display glasses, these transmitters or receivers allow THz signals to radiate certain locations of a human head and receive reflections thereof. The received signals may be used to detect/derive various bio conditions (e.g., brain condition).

The present invention realizes terahertz wireless transmission with low phase noise and high output. A coherent combining photoelectric conversion apparatus transmits, from a transmission antenna, a wireless signal obtained by modulating a carrier signal with a baseband signal including an information signal, and includes: a micro-optical resonator (2) that is excited by laser light and generates an optical frequency comb with a frequency interval f.sub.rep that is 100 GHz or more and 3 THz or less; a modulated signal generation unit (3) that separates a plurality of mutually adjacent optical frequency mode pairs from the optical frequency comb, and optically modulates one optical frequency mode of each pair using the same baseband signal; a photoelectric conversion element unit (4) that is provided in the transmission antenna and includes one or more photoelectric conversion elements that mix the optical frequency modes of each pair to generate a group of high-frequency electromagnetic wave signals having a frequency interval equal to the frequency interval f.sub.rep; and phase offset adjustment units (301, 302) that adjust a phase offset between the group of high-frequency electromagnetic wave signals.