%0 Thesis
%9 Doctoral
%A Chuang, C.H.
%B Department of Electronic and Electrical Engineering
%D 2009
%F discovery:18757
%I UCL (University College London)
%P 214
%T Indium phosphide based asymmetric Fabry-Perot modulator/detector photonic antennas for bidirectional wireless transmission
%U https://discovery.ucl.ac.uk/id/eprint/18757/
%X Distribution of IEEE 802.11a Wireless Local Area Networks (WLAN) using wireless  over fibre (WOF) technology have been achieved by employing novel InP based Asymmetric  Fabry-Perot Modulator/detectors (AFPM) with quaternary material system InGaAs/AlInGaAs  Multiple Quantum Wells (MQW). The Quantum-Confined Stark Effect (QCSE) electroabsorption  AFPM operates simultaneously as an optical intensity modulator on the uplink and as  a conventional photodetector on the downlink. In this work, the design and fabrication of the new  InGaAs/AlInGaAs MQW AFPM device is developed and discussed.  The electrical and optoelectronic characterisation of the AFPM shows an improved modulation  slope –dR/dV of over 40 %/V, where dR is the differential optical reflectance and dV is the  differential terminal voltage, compared to the previously reported 6-10 %/V achieved with an  InGaAsP/InGaAsP MQW AFPM. The modulation bandwidth exceeds 18 GHz, hence verifying  the feasibility of the AFPM for integration with an Electromagnetic Band Gap (EBG) antenna to  perform data transmission in real environments.  The design and integration processes of the EBG photonic antenna are described. In  addition, the first bi-directional link and IEEE802.11a WLAN data transmission experiments  using EBG photonic antenna and 2 x 2 photonic array antennas with integrated  InGaAs/AlInGaAs MQW AFPMs are reported and compared with uncooled directly modulated  lasers. Half-duplex IEEE 802.11a connection was successfully established between a laptop  computer and the photonic antenna, which in turn was connected via an optical fiber to a wireless  access point. A maximum data throughput of 7 Mbps was achieved at 8 m separation between  the laptop and the photonic antenna.
%Z Authorisation for digitisation not received