Ahead of Print article · Journal article
THz Wireless Transmission Systems Based on Photonic Generation of Highly Pure Beat-Notes
Tianjin University1
Department of Photonics Engineering, Technical University of Denmark2
Ultra-fast Optical Communication, Department of Photonics Engineering, Technical University of Denmark3
Centre of Excellence for Silicon Photonics for Optical Communications, Centers, Technical University of Denmark4
Terahertz Science & Technology, Department of Photonics Engineering, Technical University of Denmark5
In this paper, a terahertz (THz) wireless communication system at 400 GHz with various modulation formats [on–off keying (OOK), quadrature phase-shift keying (QPSK), 16-quadrature amplitude modulation (16-QAM), and 32-quadrature amplitude modulation (32-QAM)] is experimentally demonstrated based on photonic generation of highly pure THz carriers.
The experimental THz wireless photonic transmission system is enabled by the ultrawideband behavior of an antenna-integrated unitraveling-carrier-photodiode-based transmitter and a Schottky mixer-based THz receiver. In the experiment, a phase-correlated optical frequency comb (OFC) is created for photomixing generation of the desired THz carrier frequencies with low phase noise.
The OFC allows for the generation of flexibly tunable THz carrier frequencies. The performance of the generated THz carriers is experimentally characterized in terms of phase noise, spectrum purity, tunability, and long-term stability. In the case of generating 400 GHz carrier, the measured timing jitter, linewidth, and long-term stability in the experiment are 51.5 fs, less than 2 Hz, and less than ±1 Hz with 3 hours, respectively.
We also theoretically analyze the phase noise of photonically generated THz beat-notes when phase correlation of two optical comb tones is damaged due to their path-length difference. In addition, we demonstrate THz wireless transmission of various modulation formats, including OOK, QPSK, 16-QAM, and 32-QAM at beyond 10 Gb/s in such a system, and the measured bit error rate (BER) performance for all the signals after 0.5 m free-space delivery is below the hard decision forward error correction threshold of 3.8 × 10–3.
Furthermore, the influence of THz carrier purity on the system performance is experimentally analyzed with respect to the BER of the THz communication signals.
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 2016 |
| Pages: | 1-1 |
| ISSN: | 19430647 and 19430655 |
| Types: | Ahead of Print article and Journal article |
| DOI: | 10.1109/JPHOT.2016.2600345 |
| ORCIDs: | Hu, Hao , Morioka, Toshio , Jepsen, Peter Uhd and Oxenløwe, Leif Katsuo |
16-QAM 16-quadrature amplitude modulation 32-QAM 32-quadrature amplitude modulation BER Codes Free-space optical links Frequency measurement Integrated optics Integrated optoelectronics Modulation and coding methods OOK Optical communication devices, equipment and systems Optical communication equipment Optical modulation Optical transmitters Phase noise Photoelectric devices Photonics QPSK Stability analysis THz carriers THz photonics THz wireless communication THz wireless transmission systems Wireless communication amplitude shift keying bit error rate distance 0.5 m error statistics forward error correction free-space delivery free-space optical communication frequency 400 GHz highly pure beat-notes integrated optics integrated optoelectronics linewidth long-term stability modulation formats on-off keying optical comb tones optical frequency comb (OFC) optical transmitters path-length difference phase correlation phase noise photodiodes photomixing. photonic generation quadrature amplitude modulation quadrature phase shift keying quadrature phase-shift keying spectrum purity terahertz wireless communication system time 51.5 fs timing jitter tunability unitraveling carrier photodiode (UTC-PD)
Applied optics. Photonics Optics. Light QC350-467 TA1501-1820
