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oapen-20.500.12657-492352021-11-23T14:05:24Z Chapter Digital All-Optical Physical-Layer Network Coding Mitsolidou, Charikleia Vagionas, Chris Tsiokos, Dimitris Pleros, Nikos Miliou, Amalia all-optical physical-layer network coding (AOPNC), radio over fiber (ROF), millimeter wave communication, optical logic gates, semiconductor optical amplifier-Mach Zehnder interferometer (SOA-MZI) bic Book Industry Communication::U Computing & information technology Network coding (NC) has recently attracted intense research focus for its potential to provide network throughput enhancements, security and reduced network congestions, improving in this way the overall network performance without requiring additional resources. In this chapter, the all-optical physical-layer network coding (AOPNC) technique is presented, focusing on digital encoding schemes that are based on optical XOR logical gates. It is also discussed how digital AOPNC can be implemented between sub-carrier-modulated (SCM) optical signals in radio-over-fiber (RoF) networks, circumventing the enhanced complexity arising by the use of SCM signals and the asynchrony that might exist between the data arriving at the encoding unit. AOPNC demonstrations are described for simple on/off keyed (OOK)-SCM data signals, as well as for more sophisticated higher-order phase modulation formats aiming to further improve spectrum efficiency and transmission capacity. 2021-06-02T10:10:11Z 2021-06-02T10:10:11Z 2018 chapter ONIX_20210602_10.5772/intechopen.75908_349 https://library.oapen.org/handle/20.500.12657/49235 eng application/pdf n/a 60377.pdf InTechOpen 10.5772/intechopen.75908 10.5772/intechopen.75908 09f6769d-48ed-467d-b150-4cf2680656a1 H2020-EO-2017 612257 722429 open access
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Network coding (NC) has recently attracted intense research focus for its potential to provide network throughput enhancements, security and reduced network congestions, improving in this way the overall network performance without requiring additional resources. In this chapter, the all-optical physical-layer network coding (AOPNC) technique is presented, focusing on digital encoding schemes that are based on optical XOR logical gates. It is also discussed how digital AOPNC can be implemented between sub-carrier-modulated (SCM) optical signals in radio-over-fiber (RoF) networks, circumventing the enhanced complexity arising by the use of SCM signals and the asynchrony that might exist between the data arriving at the encoding unit. AOPNC demonstrations are described for simple on/off keyed (OOK)-SCM data signals, as well as for more sophisticated higher-order phase modulation formats aiming to further improve spectrum efficiency and transmission capacity.
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