A 2.4‐GHz wireless‐over‐fiber transceiver using photonic active integrated antennas (PhAIAs)

Abstract

New composite materials with a high percentage of their composition based on renewable resources, matrix and reinforcement, were prepared. The excellent compatibility of the main phases lead to an unusual outstanding composite behavior as follows: higher modulus and strength, but also higher deformability and fracture resistance than the neat polymer. A bio‐based polyol was obtained by chemical modification of tung oil to be used in the production of polyurethane composites reinforced with pine wood flour (WF). The mechanical behavior as a function of wood flour content was evaluated through tensile and impact tests. Increasing the filler content induced an increase in tensile modulus and strength as well as in impact strength. Composites containing 10 and 15 wt% of wood flour presented higher tensile ultimate strain than that of the unfilled polyurethane. These results were explained by a strong interfacial adhesion (physical and chemical bonding), which was also supported by SEM micrography and strength modeling. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers

A Fully Bidirectional 2.4-GHz Wireless-Over-Fiber System Using Photonic Active Integrated Antennas (PhAIAs)

“…Finally, only one antenna-antenna link is used. This has the effect of increasing the input power to the link, and this is the main reason why amplification can be removed and why the RF range has increased so dramatically from 10 cm in [1] to around 10 m in this paper. It is felt that this is a commercially viable configuration where RF power can be tapped off coaxially from an existing access point and fed into a purely coaxial transceiver.…”

“…There are three main differences between this configuration and that shown in [1]. First, this is fully low cost using two 850-nm VCSELs and two PDs.…”

“…To this end, the input impedance of both the VCSEL and PD are presented here. PD impedances were presented in [1], but this was for a 1550-nm device. In addition, 850-nm VCSEL return loss was shown; however, it is believed that this paper is one of the first to present detailed studies of deembedded VCSEL and PD input impedance in the 0-10-GHz frequency range.…”

“…T HE photonic-active-integrated-antenna (PhAIA) concept is the intimate integration of photonic devices with antennas [1]; it is an extension to the well-known active-integratedantenna (AIA) concept from the microwave-engineering field [2]. The fact that the photonic device and antenna are highly integrated means that very efficient impedance matching can be achieved, which can lead to improved link gain [3].…”

A 2.4-GHz Wireless-Over-Fibre System Using Photonic Active Integrated Antennas (PhAIAs) and Lossless Matching Circuits

“…However, EAMs are not low cost and can suffer from low responsivity and be polarization sensitive. The approach outlined in [7] shows that low cost vertical cavity surface emitting lasers (VCSELs) can be used within the photonic active integrated antenna (PhAIA) concept [7], [9] which enables integrated modules with no RF amplification to be used at the remote end. The use of VCSELs with low bias current requirements and the removal of RF amplification and associated DC biasing circuitry results in a very low DC power budget, in the order of 10 mW, at the remote end which opens possibilities for DC power-over-fibre operation [10], further reducing implementation costs.…”