4.7 Article

Pilot-Tone Assisted 16-QAM Photonic Wireless Bridge Operating At 250 GHz

Journal

JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 39, Issue 9, Pages 2725-2736

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2021.3053616

Keywords

Broadband communications; digital signal processing; microwave photonics; millimeter wave communications; optical mixing; sub-THz communications; wireless bridge

Funding

  1. European Union [761579]
  2. Engineering and Physical Sciences Research Council through the COALESCE [EP/P003990/1]
  3. EPSRC [EP/P003990/1] Funding Source: UKRI

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This study introduces and demonstrates a photonic wireless bridge operating at a carrier frequency of 250 GHz, utilizing tone-assisted carrier recovery to mitigate phase noise from free-running lasers. The wireless bridge achieves 50 Gbit/s transmission in a single channel configuration and high-capacity transmission across the full band in wavelength division multiplexing scenarios. However, the limited transmission distance of 10 cm is attributed to the low power emitted by the uni-travelling carrier photodiode used in the experiments.
A photonic wireless bridge operating at a carrier frequency of 250 GHz is proposed and demonstrated. To mitigate the phase noise of the free-running lasers present in such a link, the tone-assisted carrier recovery is used. Compared to the blind phase noise compensation (PNC) algorithm, this technique exhibited penalties of 0.15 and 0.46 dB when used with aggregated Lorentzian linewidths of 28 and 359 kHz, respectively, and 20 GBd 16-quadrature amplitude modulation (QAM) signals. The wireless bridge is also demonstrated in a wavelength division multiplexing (WDM) scenario, where five optical channels are generated and sent to the Tx remote antenna unit (RAU). In this configuration, the full band from 224 to 294 GHz is used. Finally, a 50 Gbit/s transmission is achieved with the proposed wireless bridge in single channel configuration. The wireless transmission distance is limited to 10 cm due to the low power emitted by the uni-travelling carrier photodiode used in the experiments. However, link budget calculations based on state-of-the-art THz technology show that distances >1000m can be achieved with this approach.

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