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Real-time demonstration of 103.125-Gbps fiber–THz–fiber 2 × 2 MIMO transparent transmission at 360–430 GHz based on photonics

Jiao Zhang, Min Zhu, Mingzheng Lei, Bingchang Hua, Yuancheng Cai, Yucong Zou, Liang Tian, Aijie Li, Yanyi Wang, Yongming Huang, Jianjun Yu, and Xiaohu You

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Abstract

In this Letter, we experimentally demonstrate the first real-time transparent fiber–THz–fiber 2 × 2 multiple-input multiple-output (MIMO) transmission system with a record line rate of 125.516 Gbps at 360–430 GHz based on photonic remote heterodyning, hybrid optoelectronic down-conversion, and commercial digital coherent modules. The 103.125-Gbps net data rate using dual-polarization quadrature phase-shift keying (DP-QPSK) modulation is successfully transmitted over two spans of 20-km standard single-mode fiber (SSMF) and 60-cm wireless distance under 15% soft-decision forward error correction (SD-FEC) for a pre-FEC bit error ratio (BER) threshold of 1.56 × 10−2 (post-FEC BER < 10−15). The optical signal to noise ratio (OSNR) margin and the stability of the transmission system are extensively investigated. To the best of our knowledge, this is the first time to realize >100-Gbps real-time transparent fiber–THz–fiber link transmission at beyond the 350-GHz band, making it a promising scheme to pave the way towards a practical seamless integration of a fiber–THz–fiber link to the future 6G mobile communication system.

© 2022 Optica Publishing Group

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Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Figures (7)
Fig. 1.
Fig. 1. (a) Spectrum release by the WRC-19 decision. (b) Prospective seamless integration of fiber–THz–fiber link scenarios.

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Fig. 2.
Fig. 2. Experimental setup of real-time photonics-aided transparent fiber–THz–fiber 2 × 2 MIMO transmission system over two spans of 20-km SSMF and 60-cm wireless distance. Photos of: (a) 100-GbE transmission platform; (b) fiber–THz wireless end; (c) THz wireless–fiber end.

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Fig. 3.
Fig. 3. Measured frequency spectrum after: (a) optical coupler; (b) low-noise amplifier; (c) intensity-modulator; (d) tunable optical filter.

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Fig. 4.
Fig. 4. BER versus ECL-2 to optical signal frequency spacing at 370 GHz with 10.5-dBm input power into each AIPM for the BtB case.

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Fig. 5.
Fig. 5. BER versus input power into each AIPM for the BtB case without fiber and wireless transmission.

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Fig. 6.
Fig. 6. (a) BER versus input power into each AIPM over two spans of 20-km SSMF and 60-cm wireless distance. (b) Photo of 1-m wireless link.

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Fig. 7.
Fig. 7. (a) OSNR versus THz-wave carrier frequency for different cases. (b) BER versus test time at 370 GHz with 12.5-dBm input power into each AIPM over two spans of 20-km SSMF and 60-cm wireless distance.

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