Optical Multilevel Pulse Width Modulation for Analog Mobile Fronthaul. Combi, L., Gatto, A., Boffi, P., Spagnolini, U., Parolari, P., Combi, L., Gatto, A., Boffi, P., Spagnolini, U., & Parolari, P. Photonics, 5(4):49, Multidisciplinary Digital Publishing Institute, 11, 2018.
Optical Multilevel Pulse Width Modulation for Analog Mobile Fronthaul [link]Website  abstract   bibtex   
The evolution of radio access networks is towards a centralized architecture (C-RAN), with massive antenna deployments and large radio-frequency bandwidths. In the next future, traditional optical transport technologies based on digital radio over fiber will no longer be able to support the mobile fronthaul traffic connecting antennas hosted at remote radio units and centralized baseband units. Analog radio over fiber can be selected to support the mobile fronthaul (MFH) network and, in particular, pulse width modulation (PWM) is a viable alternative for analog signal transport. In order to increase the MFH spectral efficiency, we propose to exploit multilevel PWM (M-PWM) in a wavelength division multiplexing-passive optical network (WDM-PON) network, comparing its performance with a conventional 2-level PWM solution. Experimental results show successful transmission over 7.5-km standard single mode fiber (SSMF) of up to 16 aggregated LTE-like 20-MHz signals with 64-QAM on each subcarrier, while up to eight aggregated LTE-like 20-MHz signals with 256-QAM could be supported. M-PWM thus allows either using higher order modulation formats or aggregating a higher number of LTE channels.
@article{
 title = {Optical Multilevel Pulse Width Modulation for Analog Mobile Fronthaul},
 type = {article},
 year = {2018},
 identifiers = {[object Object]},
 pages = {49},
 volume = {5},
 websites = {http://www.mdpi.com/2304-6732/5/4/49},
 month = {11},
 publisher = {Multidisciplinary Digital Publishing Institute},
 day = {23},
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 abstract = {The evolution of radio access networks is towards a centralized architecture (C-RAN), with massive antenna deployments and large radio-frequency bandwidths. In the next future, traditional optical transport technologies based on digital radio over fiber will no longer be able to support the mobile fronthaul traffic connecting antennas hosted at remote radio units and centralized baseband units. Analog radio over fiber can be selected to support the mobile fronthaul (MFH) network and, in particular, pulse width modulation (PWM) is a viable alternative for analog signal transport. In order to increase the MFH spectral efficiency, we propose to exploit multilevel PWM (M-PWM) in a wavelength division multiplexing-passive optical network (WDM-PON) network, comparing its performance with a conventional 2-level PWM solution. Experimental results show successful transmission over 7.5-km standard single mode fiber (SSMF) of up to 16 aggregated LTE-like 20-MHz signals with 64-QAM on each subcarrier, while up to eight aggregated LTE-like 20-MHz signals with 256-QAM could be supported. M-PWM thus allows either using higher order modulation formats or aggregating a higher number of LTE channels.},
 bibtype = {article},
 author = {Combi, Lorenzo and Gatto, Alberto and Boffi, Pierpaolo and Spagnolini, Umberto and Parolari, Paola and Combi, Lorenzo and Gatto, Alberto and Boffi, Pierpaolo and Spagnolini, Umberto and Parolari, Paola},
 journal = {Photonics},
 number = {4}
}

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