A wearable speckle-based heart-rate monitoring device is presented. It uses a lead of plastic optical fiber (POF), as the sensing element. The system includes a microprocessor-powered portable system that controls a laser and a CMOS camera to take real-time measurements. A simple optical system is considered to provide portable capabilities. Several processing algorithm alternatives are assessed, using a device under test for emulating the heart-rate mechanical vibrations. Errors below 1% are achieved for some filter and processing techniques.
KEYWORDS: Radio over Fiber, Radio optics, Phase only filters, Optical fibers, Energy efficiency, Photovoltaics, Solar cells, Antennas, Wavelength division multiplexing, Solar energy
Future high capacity of the 5th Generation radio environment will boost transport networks to be adapted. The high bandwidth, together with stringent delay and jitter requirements, make dedicated optical connectivity a preferred solution for fronthaul. Those Radio Access Networks apart from higher capacity and lower latency should have higher energy efficiency. In order to cover this aspect, power over fiber has been pointed out as a key technology for that purpose having in mind that control plane will be centralized on future Cloud RAN and that sometimes Remote Radio Heads should be deployed in places lacking external power supply in order to fulfill the desired coverage. In this paper, different scenarios on potential demanding environments of power over fiber on Radio over Fiber systems such as automotive, in-house and remote mobile fronthaul will be discussed. Some tests on power over fiber systems based on different optical fibers are provided.
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