120 Gb/s Multi-Channel THz Wireless Transmission and THz Receiver Performance Analysis

Terahertz-Wave Generation Based on Optical Frequency Comb and Single Mach-Zehnder Modulator

“…In the remote heterodyne technique, two light carriers of different wavelengths generated from two separate lasers, and the fixed THz-wave can be obtained after passing through the beat frequency of the optical detector and the high speed baseband signal can be transparently loaded onto the THz-wave carrier [4]- [9], [15]- [20]. But it is based on multiple free running lasers, the frequency interval of lasers and their phases float on their own, phase noise regulation procedure at receiver end is required to be processed in DSP, which contributes to the increase of the processing time and system complexity [21]. The third category is the optical frequency comb based on only single laser and optical modulators in series in the THz-band RoF systems [11], [15], [18], [22]- [24].…”

Chip Based THz Emitter for Ultra-high Speed THz Wireless Communication

“…In terms of THz wireless commutations, the carrier frequencies ranging from 350-910 GHz have been recommended for indoor communications with the 10-100 m range [3]. Extensive research has been conducted to achieve high data rates transmissions at these frequencies [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Using photonic schemes, high data rates have been achieved by frequency division multiplexing techniques often yielding data rates of 100 Gbit/s and above.…”

3.5 Gbit/s OOK THz signal delivery over 88 cm free‐space at 441.504 GHz

“…As micrometer wave with a shorter wavelength, THz has higher available bandwidth. Since it has enormous potential in ultra‐broad band communication, there has been many reports utilizing THz signals for high‐speed communication . Li et al demonstrated a fiber‐wireless system that delivers a 108 Gbit/s signal at 100 GHz carrier frequency adopting PDM‐QPSK (Polarization division multiplexed quadrature phase shift keying) signal.…”

“…THz communication systems proposed previously mainly use photonics to generate the THz signal . In these schemes, 2 free‐running lasers individually generate 2 optical carrier signals with different wavelength, and a photodetector can be employed to realize the beat of the 2 optical signals, which is the wide band THz signal we need.…”

“…Using this kind of method many experiments have been reported. Song et al demonstrated 24 Gbit/s wireless data transmission at 300 GHz by using a uni‐travelling carrier photodiode (UTC‐PD), Nagatsuma showed a real‐time 50‐Gbit/s transmission over 20‐m distance based on photonics aided THz generation scheme, and Jia et al successfully realized an overall capacity up to 120 Gbit/s using QPSK (quadrature phase‐shift keying) signal with the employment of 6 THz carriers. Wang et al proposed a 2 × 2 MIMO (Multiple‐Input Multiple‐Output) radio‐over‐fiber system and successfully realized a 16 QAM (quadrature amplitude modulation) transmission with a net bit rate of 51.2 Gbit/s.…”