## 8 Conclusions
The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results. * (12) [PERSON] Converged Fi-Wi passive optical networks and their designing using the HPON Network Configurator. In _Paving the Way for 5G Through the Convergence of Wireless Systems_, 1 st ed. ; [PERSON], [PERSON]; IGI Global: Hershey, PA, USA, 2018; pp. 150-184. [CrossRef]
* (13) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Evolution, challenges and enabling technologies for future WDM-based optical access networks. In Proceedings of the 2 nd Symposium on Photonics, Networking and Computing, Cary, NC, USA, 26-30 September 2003; pp. 1449-1453. * (14) [PERSON]; [PERSON]; [PERSON]; [PERSON] Broadband transmission in WDM-PON using a broadband light source. In Proceedings of the Conference on Optical Fiber Communication, Anaheim, CA, USA, 25-29 March 2007; pp. 1-3. [CrossRef]
* (15) [PERSON]. WDM/TDM PON Bidirectional Networks Single-Fiber/Wavelength RSOA-based ONUs Layer 1/Layer 2 Optimization. Ph.D. Thesis, Universitat Politecnica de Catalunya, Barcelona, Spain, September 2013. * (16) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] SMF/FSO integrated dual-rate reliable and energy efficient WDM optical access network for smart and urban communities. _Opt. Quant. Electr._**2021**, _53_, 625. [CrossRef] [PubMed]
* (17) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] A survivable and flexible WDM access network by alternate FSO- and fiber-paths for fault protection. _IEEE Photonics J._**2022**, _14_, 1-5. [CrossRef]
* (18) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Highly reliable metro-access network based on a dual-fiber ring architecture and optimized protection mechanisms. _IEEE Access_**2021**, \(9\), 136419-136437. [CrossRef]
* (19) [PERSON] Optimization of the optical power budget for various WDM-PON network designs with traffic protection securing. In Proceedings of the International Conference on Software, Telecommunications and Computer Networks SoftCOM, Split, Croatia, 13-15 September 2018; pp. 76-81. [CrossRef]
* (20) [PERSON] Performance Analysis of TDM-PON Protection Schemes by Means of the PON Network Availability Evaluator. In Proceedings of the Seventh International Congress on Information and Communication Technology ICICT, London, UK, 21-24 February 2022. [CrossRef]
* (21) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Wavelength-division-multiplexed passive optical network technologies for broadband access: A review. _J. Opt. Netw._**2005**, \(4\), 737-758. [CrossRef]
* (22) [PERSON]; [PERSON]; [PERSON]; [PERSON] Efficient resource management via dynamic bandwidth sharing in a WDM-PON ring-based architecture. In Proceedings of the 14 th International Conference on Transparent Optical Networks, Coventry, UK, 2-5 July 2012; pp. 1-4. [CrossRef]
* (23) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Ring-based WDM access network providing both Rayleigh backscattering noise mitigation and fiber-fault protection. _J. Lightwave Technol._**2012**, _30_, 3211-3218. [CrossRef]
* (24) [PERSON] _Hybrid PON Networks--Features, Architectures and Configuration_; LAP Lambert Academic Publishing: Saarbrucken, Germany, 2015; ISBN 978-3-659-43686-4. * (25) ITU-T. _Series G--Supplement 51: Passive Optical Network Protection Considerations_; International Telecommunication Union: Geneva, Switzerland, 2016. * (26) [PERSON]; [PERSON]; [PERSON] Assessment methodology of protection schemes for next generation optical access networks. _Opt. Fiber Technol._**2015**, _26_, 82-93. [CrossRef]
* (27) [PERSON]; [PERSON] Optical coding for next-generation survivable long-reach passive optical networks. _J. Opt. Commun. Netw._**2012**, \(4\), 1062-1074. [CrossRef]
* (28) [PERSON]; [PERSON] Availability analysis of shared backup path protection under multiple-link failure scenario in WDM networks. _Ann. Telecommun.-Ann. Telecommun._**2014**, _70_, 249-262.