THz Wireless Transmission Systems Based on Photonic Generation of Highly Pure Beat-Notes

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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.
Original languageEnglish
Article number7905808
JournalI E E E Photonics Journal
Volume8
Issue number5
Number of pages8
ISSN1943-0655
DOIs
Publication statusPublished - 2016

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    Research areas

  • Optical communication devices, equipment and systems, Integrated optics, Optical communication equipment, Free-space optical links, Photoelectric devices, Integrated optoelectronics, Modulation and coding methods, Codes, amplitude shift keying, error statistics, forward error correction, free-space optical communication, integrated optics, integrated optoelectronics, optical transmitters, phase noise, photodiodes, quadrature amplitude modulation, quadrature phase shift keying, timing jitter, BER, free-space delivery, bit error rate, path-length difference, optical comb tones, phase correlation, linewidth, long-term stability, tunability, spectrum purity, THz carriers, 32-QAM, 32-quadrature amplitude modulation, 16-QAM, 16-quadrature amplitude modulation, QPSK, quadrature phase-shift keying, OOK, on-off keying, modulation formats, terahertz wireless communication system, highly pure beat-notes, photonic generation, THz wireless transmission systems, frequency 400 GHz, time 51.5 fs, distance 0.5 m, Wireless communication, Phase noise, Photonics, Optical transmitters, Stability analysis, Frequency measurement, Optical modulation, photomixing., THz wireless communication, THz photonics, unitraveling carrier photodiode (UTC-PD), optical frequency comb (OFC)

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