On N-PAM and M-QAM implementation within the hybrid RoF-FSO-PON system

Nguyen, Dong-Nhat, Bohata, Jan, Vallejo, Luis, Zvanovec, Stanislav, Ortega, Beatriz and Ghassemlooy, Zabih (2020) On N-PAM and M-QAM implementation within the hybrid RoF-FSO-PON system. In: 2020 3rd West Asian Symposium on Optical and Millimeter-wave Wireless Communication (WASOWC). Institute of Electrical and Electronics Engineers Inc., Piscataway, NJ, pp. 1-5. ISBN 9781728186924, 9781728186917

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Abstract

This paper investigates an optical transmission architecture of a passive optical network (PON), which is compatible with the millimeter-wave radio-over-fiber and free-space optics systems (RoF-FSO) under weak-to-strong atmospheric turbulence (AT) regimes to enable seamless connectivity as part of next-generation broadband wireless access networks. We first analyze and evaluate in simulation the transmission performance of the integrated system at 40 GHz for 10 Gb/s N-pulse amplitude modulation (N-PAM) with N = 2, 4. Link performance shows that, 4-PAM outperforms 2-PAM in terms of tolerance to the combined impairment of fiber chromatic dispersion and AT. We then experimentally demonstrate the proof-of-concept integrated RoF-FSO-PON at 25 GHz using 20 MHz M-quadrature amplitude modulation (M-QAM) signals with M = 4, 16, 64. We show that, for QAM with a higher-order M, the link performance is being more affected by the combined impairments.

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