Abstract

Seamless integration of optical fiber and wireless transmission systems using coherent radio-over-fiber (CRoF) technique is a promising solution for highly resilient and agile communication systems, where high-capacity millimeter wave (mmWave) links can conveniently be used as fiber backup to bolster the network resiliency while satisfying the requirements of both high capacity and long transmission distance. In this paper, we introduce and experimentally validate a comprehensive optimization framework for photonic generation of mmWave signals based on dual-parallel Mach-Zehnder modulator (DP-MZM) with unbalanced power splitting ratio. The derived values provide high sub-harmonics suppression ratio while maximizing the conversion efficiency. Moreover, we demonstrate and evaluate the transmission of 5-Gbaud QPSK signal over seamless RoF and W-band mmWave (75–110 GHz) wireless links. We also investigate the impact of the W-band wireless section link loss, W-band devices characteristics and the mmWave down-conversion intermediate frequency (IF) selection on the overall system performance. The obtained results will enable us to design a seamless mmWave-RoF transmission system in practical scenarios and also confirm the potential use of the system for next generation agile and resilient optical access networks.

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