@inproceedings{vallejo_full-duplex_2025,

title = {Full-Duplex Transmissions in Heterogeneous Fiber-FSO-Wireless Converged Access Networks at Ka-Band},

author = {Luis Vallejo and Jose Mora and Beatriz Ortega and Wei Jin and Jaime Romero and Jianming Tang},

url = {https://ieeexplore.ieee.org/document/11037218},

doi = {10.1109/EuCNC/6GSummit63408.2025.11037218},

issn = {2575-4912},

year  = {2025},

date = {2025-06-01},

urldate = {2025-10-08},

booktitle = {2025 Joint European Conference on Networks and Communications & 6G Summit (EuCNC/6G Summit)},

pages = {840–845},

abstract = {To overcome the challenges associated with increased demands for mobile capacity and network densification in the 5 G and beyond era, this paper experimentally demonstrates full-duplex heterogeneous fiber-FSO-wireless converged links between the central office-baseband unit (CO-BBU) and the remote radio head (RRH). The centralization of active optical sources for the downlink (DL) and uplink (UL) enables dynamic resource sharing and allocation, optimizing wavelength utilization and improving overall network efficiency. The DL uses a directly modulated laser (DML) with free-running laser-assisted mmWave signal generation and envelope detection for the downstream, transmitting a 100 textbackslashtextMHz 16-textbackslashtextQAM signal at 39 GHz. The UL reuses the DL wavelength for upstream transmission, employing intensity modulation and direct detection (IM-DD) of a 100 MHz QPSK signal at 36.5 GHz. The bidirectional heterogeneous network comprises a 10 km SSMF, a 1.8 m FSO link, and a 3 m wireless radio link, providing flexibility for future networks. The results show successful transmissions of 16-QAM and QPSK signals up to 200 textbackslashtextMbit / textbackslashmathrms and 400 textbackslashtextMbit / textbackslashmathrms for DL and UL, respectively, under the full-duplex transmissions. Additionally, using 5G NR OFDM signals, a maximum bit rate of 2.15 textbackslashtextGbit / textbackslashmathrms and 1.07 Gbit/s is achieved for the DL and UL, respectively, demonstrating the cost-effectiveness of the proposed solution.},

note = {ISSN: 2575-4912},

keywords = {5G mobile communication, B5G, bidirectional heterogeneous networks, converged networks, free-running lasers, Full-duplex system, fullduplex, Heterogeneous networks, Millimeter wave communication, mmWave, Phase shift keying, Radio links, Resource management, RF envelope detection, Throughput, Uplink, Wireless communication},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{abdelhamid_gonem_seamless_2024,

title = {Seamless Fiber-Wireless Access Network Convergence with Dynamic O-E-O Conversion-less Sub-Wavelength Switching and Tunable Photonic mmWave Generation},

author = {Omaro Fawzi Abdelhamid Gonem and Luis Vallejo and Jiaxiang He and Roger Philip Giddings and Wei Jin and Xingwen Yi and Md Saifuddin Faruk and Jianming Tang},

url = {https://ieeexplore.ieee.org/document/10809809},

doi = {10.1109/ACP/IPOC63121.2024.10809809},

issn = {2162-1098},

year  = {2024},

date = {2024-11-01},

urldate = {2025-10-08},

booktitle = {2024 Asia Communications and Photonics Conference (ACP) and International Conference on Information Photonics and Optical Communications (IPOC)},

pages = {1–4},

abstract = {In order to meet the diverse needs of different services and applications in the B5G era, seamless integration of fiber and wireless network segments of next-generation radio access networks (NG-RANs), with flexible/fine channel switching granularity and ultra-low latency, is vital for enabling dynamic and continuous flow of heterogenous signals of various characteristics across different network segments without optical-electrical-optical (O-E-O) conversions or digital signal processing (DSP) at intermediate nodes. To address these requirements cost-effectively, we experimentally demonstrate 3xl.333 Gbps flexible BBU-UE connections over 10 km standard single-mode fiber (SSMF) and adaptable millimeter-wave (mmWave) wireless reach up to 50 m, using free-running laser/envelope detection-based tunable mm Wave generation/detection, and soft-ROADM-enabled dynamic sub-wavelength-level channel switching. The proposed technique requires no O-E-O conversions or DSP at intermediate nodes and offers dynamic RRH-controllable mmWave transmission with large frequency tunability and adaptive wireless network coverage.},

note = {ISSN: 2162-1098},

keywords = {Adaptive systems, B5G, Digital signal processing, fiber-wireless converged access networks, free-running lasers, Millimeter wave communication, millimeter waves, Optical fiber networks, Optical fibers, Optical signal processing, Optical switches, optical switching, Photonics, reconfigurable optical add/drop multiplexer (ROADM), Standards, Wireless networks},

pubstate = {published},

tppubtype = {inproceedings}

}