Some of the studies represented the hybrid mm-wave RoF system optical OFDM signal transmission using various techniques such as POLMUX, double-lens scheme, and polarization multiplexing technique over 50 km over SSMF and 20 m wireless link. OFDM-based RoF system has been widely studied and verified performance in terms of spectral signal purity and system robustness characteristics against optical fiber chromatic dispersion (CD), polarization mode dispersion (PMD), etc.
Inline to the above, it also shows the capability to fulfill the requirements of upcoming 5G network access. Though it has disadvantage of huge propagation loss and caters for small distance communication, still it is found to be the most suitable wireless communication link ultra-wide bandwidth access. In mm-wave, 60 GHz is the unlicensed spectrum which is becoming popular and would be a most promising band for 5G communication. The research is focused on generating, transporting, and distributing radio signal in mm-wave band over optical fiber to meet the requirement of next-generation broadband 5G technology. The RoF has grown expressively and achieved good technical maturity in the past 3 decades. System performance and obtained results show a potential to fulfill the requirements of 5G and cellular communication system. The proposed RoF system’s outcomes have shown relatively better bit error rate (BER) of 3.1 × 10 –3 to enable successful transmission of 110 Gbps data for more than 105 km optical link comprising of standard single-mode fiber (SSMF). We propose a system comprised of 60 GHz radio-over-fiber (RoF) model using optimized optical frequency quadrupling, coherent detection, channel estimation, and carrier phase correction techniques for ultra-wide bandwidth 16-quadrature amplitude modulation (QAM) OFDM baseband signal. 60 GHz millimeter-wave (mm-wave) frequency band is also becoming a most popular upcoming frequency spectrum due to today’s available dense frequency spectrum used for mobile, multimedia, and data communication, etc. The optical orthogonal frequency division multiplexing (OFDM) is proven to be a most promising technology for the next-generation high-capacity and ultra-wide bandwidth 5G communication systems.
Sunil N Thool*, Devendra Chack and Amitesh Kumar
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