## 5 Conclusions  
A hybrid PoF-RoF architecture topology using Raman has been proposed and studied, focusing on the use of two types of HPLS: a 1480 nm Raman-based HPLS and a 1550 nm EDFA-based HPLS. This study investigated the performance over different link lengths of 5 km, 10 km, and 15 km of SMF-28, offering a comparative analysis based on optical Raman gain and theoretical and experimental RF performance metrics. A strong correlation between the experimental and theoretical results validated the robustness of the proposed models. The results highlighted a critical limitation on the maximum input HPLS power that can be transmitted through the fiber without causing instabilities for different lengths of fiber. These instabilities, influenced by the stimulated Raman scattering effect and high optical power levels, impose limitations on the PoF-RoF system in terms of optical and RF performances. Despite this limitation, optical Raman amplification demonstrated notable improvements in RF gain, NF, and SFDR. The hybrid Raman-based and EDFA-based links achieved comparable RF gains of approximately 20 dB for fiber lengths of 10 km and 15 km. However, at 5 km, only the hybrid Raman-based link maintained this RF gain level due to the lower amplification at this length in the EDFA-based link. When compared with the EDFA-based link, performance degradation was observed at high input HPLS powers in the Raman-based configuration, particularly in NF and SFDR, making the link less suitable for scenarios requiring a low-noise operation. Among the configurations and fiber lengths studied, the EDFA-based HPLS for the 10 km link emerged as the optimal choice, offering the lowest NF of 31 dB and an RF gain comparable to that of the best Raman-based configuration. Furthermore, the 10 km EDFA-based link showed approximately 11 dB less NF than the best-measured NF for the Raman-based link while maintaining sufficient optical power to meet the energy demands at the remote station and higher RF gain. The EDFA-based system's consistent performance makes it suitable not only for the 10 km links but also for shorter distances, offering the best trade-off between optical and RF performance. The PoF system successfully achieved its objectives by effectively powering the bias controller and the low-power LNA1 in the remote station. The operation of these electronic components required approximately 263 mW of electrical power, which was met using fiber lengths of 5 km in the hybrid Raman-based link, and 5 km and 10 km in the hybrid EDFA-based link. Therefore, the system demonstrated satisfactory performance in both RoF and PoF, enabling remote operation as a fully photonic system that supports both data transmission and power delivery through a single SMF-28 fiber. Future research should explore potential applications in more complex environments, such as WDM networks, where various HPLS can be employed to enhance signal amplification across multiple bands. Additionally, integrating a phase modulator could help reduce power consumption in the remote station, facilitating the implementation of a better LNA. Furthermore, while analog RF metrics offer a comprehensive perspective on link performance before analog-to-digital conversion, evaluating metrics such as EVMand BER is essential for assessing performance post-conversion. This would establish a clearer correlation between the performance of the analog RF characteristics and its digital performance. **Author Contributions:** Conceptualization, V.Q., M.G., L.G., A.P. and O.L.C. ; methodology and software, P.K. and R.H.S. ; validation, formal analysis and investigation P.K. ; resources, V.Q. ; data curation and writing--original draft preparation, P.K. ; writing--review and editing, P.K., V.Q., M.G., L.G., A.P. and O.L.C. ; supervision, V.Q., M.G. and L.G. ; project administration and funding acquisition, M.G. ; Advising, A.P. and O.L.C. All authors have read and agreed to the published version of the manuscript.