eprintid: 18757
rev_number: 13
eprint_status: archive
userid: 602
dir: disk0/00/01/87/57
datestamp: 2009-11-23 17:52:59
lastmod: 2009-11-23 17:52:59
status_changed: 2009-11-23 17:52:59
type: thesis
metadata_visibility: show
item_issues_count: 0
creators_name: Chuang, C.H.
title: Indium phosphide based asymmetric Fabry-Perot modulator/detector photonic antennas for bidirectional wireless transmission
ispublished: unpub
subjects: 8100
divisions: F46
note: Authorisation for digitisation not received
abstract: 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.
date: 2009-07
vfaculties: VENG
thesis_class: doctoral_md_only
language: eng
thesis_view: UCL_Thesis
full_text_status: none
pages: 214
institution: UCL (University College London)
department: Department of Electronic and Electrical Engineering
thesis_type: Doctoral
citation:        Chuang, C.H.;      (2009)    Indium phosphide based asymmetric Fabry-Perot modulator/detector photonic antennas for bidirectional wireless transmission.                   Doctoral thesis , UCL (University College London).