@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{vallejo_soft-roadm-enabled_2024,

title = {Soft-ROADM-enabled Seamlessly Converged Optical-Wireless Access Networks with Free-Running Laser-based Tunable mmWave Generation and RF Envelope Detection},

author = {Luis Vallejo and Omaro Fawzi Abdelhamid Gonem and Wei Jin and Roger Philip Giddings and Jianming Tang},

url = {https://ieeexplore.ieee.org/document/10975552},

doi = {10.1109/OECC54135.2024.10975552},

issn = {2166-8892},

year  = {2024},

date = {2024-06-01},

urldate = {2025-10-08},

booktitle = {2024 IEEE Opto-Electronics and Communications Conference (OECC)},

pages = {1–3},

abstract = {Incorporating O-E-O conversion-free Soft-ROADMs and free-running laser-based tunable mmWave generations with RF envelope detection, a cost-effective optical-wireless-converged RAN supporting flexible ultra-dense BBU-UE connectivity without O-E-O conversion and DSPs at any intermediate nodes is proposed and experimentally demonstrated, achieving 2×2.4-Gbit/s dynamic connections over 10-km fiber and 2-m @38GHz mmWave transmissions.},

note = {ISSN: 2166-8892},

keywords = {B5G, Bit rate, fronthaul, Millimeter wave communication, mmWave, Optical fiber networks, Optical fibers, Optical switches, optical switching, Photonics, radio access network (RAN), Radio access networks, Radio frequency, RF envelope detection, Wireless communication},

pubstate = {published},

tppubtype = {inproceedings}

}