Optimisation of a device for pick-up of low-frequency radio signals and transmission over polymer optical fibres

Sagnac loop incorporating a semiconductor optical amplifier without bias current to receive/modulate weak RF signals

“…Since 2006 we have being developing electromagnetic probes based on optoelectronic technology. Early efforts were focused on the LED + plastic optical fibres (POF) based links [4,5] mainly due to convenience and limited resources in our laboratory. In [4], the main contribution was the demonstration of a technique able to allow a free-error analogue remote measurement of electromagnetic field amplitude even when an attenuation variation occur in either point of a fibre-optic link.…”

“…In [4], the main contribution was the demonstration of a technique able to allow a free-error analogue remote measurement of electromagnetic field amplitude even when an attenuation variation occur in either point of a fibre-optic link. In [5], is described the impedance matching between an antenna and LED (optoelectronic device) where the concept of "effective capacitance" was introduced to simultaneously taking into account the LED impedance and the parasitic originated from the device package. Such papers were constrained on investigations of optical links based on highly multimode Poly-Methyl-Methacrylate (PMMA)-based optical fibres in the visible spectra limited up to ~500m length or by the ~ 5 MHz.km product.…”