Abstract
Power over fiber (PoF) with sleep mode operation in centralized radio access networks (C-RAN) of low power Remote Radio Heads (RRH) helps to reduce power consumption. This proposal includes bundles of single mode optical fibers (SMF) as part of the 5G C-RAN front-haul solution for providing control on power consumption by selectively activating some parts of the RRH. We experimentally demonstrate a PoF system based on 14.43 km of SMF feed by 2.24 W giving 226 mW electrical power at the RRH for control, battery charge, load operation and communication purposes. A bidirectional control channel is integrated in the central office and the RRH for providing the capability of entering in sleep mode operation and to provide information about the status of the battery and sensing elements at RRH. The optical data uplink/downlink operates over separate optical fibers shared by various RRHs and achieves low power consumption below 33 mW with low data rates. The measured PV cells conversion efficiency is above 30%. The RRH has two sleep modes of operation with a minimum power consumption of 5.8 mW.
Highlights
P OWER over fiber (PoF) is a good strategy for providing energy to remote points free of electromagnetic interference, with low weight, good galvanic isolation and with an easy integration in the infrastructure of telecommunications operators
In 5G centralized radio access networks (C-radio access networks (RAN)) deployments [13], either dedicated or shared scenarios can be considered meaning that the PoF power at 1480 nm can be sent in a dedicated fiber or can share the fiber by wavelength division multiplexing with the RoF signal, typically in the C-band
A single single mode optical fibers (SMF) feeds with 226 mW at 14.43 km for controlling and switching ON/OFF some parts of low power Remote Radio Heads (RRH) by launching 2.24 W
Summary
P OWER over fiber (PoF) is a good strategy for providing energy to remote points free of electromagnetic interference, with low weight, good galvanic isolation and with an easy integration in the infrastructure of telecommunications operators. Some authors propose using the capability of turning into sleep mode some RRHs, avoiding current situation with a continuous feeding even with no users in the cell and for providing the maximum traffic load. Single mode optical fibers (SMF) provide lower power levels but at higher link lengths being more suitable for C-RAN fronthauls using ARoF for distances around 10 km or more [8], [9] if one considers the use of an already deployed infrastructure to provide control functionalities and partial powering. We focus in low and medium power consumption RRHs and their remote control means to improve efficiency using different sleep mode operations. We experimentally demonstrate a PoF system based on 14.43 km of SMF feed by 2.24 W giving 226 mW electrical power at the RRH for control, battery charge, load operation and communication purposes.
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