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Indium phosphide based asymmetric Fabry-Perot modulator/detector photonic antennas for bidirectional wireless transmission

Chuang, C.H.; (2009) Indium phosphide based asymmetric Fabry-Perot modulator/detector photonic antennas for bidirectional wireless transmission. Doctoral thesis, UCL (University College London).

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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.

Type:Thesis (Doctoral)
Title:Indium phosphide based asymmetric Fabry-Perot modulator/detector photonic antennas for bidirectional wireless transmission
Language:English
Additional information:Authorisation for digitisation not received
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering

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