EPSRC logo

Details of Grant 

EPSRC Reference: GR/L83783/01
Principal Investigator: Aitchison, Professor S
Other Investigators:
Marsh, Professor JH
Researcher Co-Investigators:
Project Partners:
Pre Nexus Migration QinetiQ
Department: Electronics and Electrical Engineering
Organisation: University of Glasgow
Scheme: Standard Research (Pre-FEC)
Starts: 01 January 1998 Ends: 31 December 2000 Value (£): 229,090
EPSRC Research Topic Classifications:
Optical Communications Optical Devices & Subsystems
EPSRC Industrial Sector Classifications:
Aerospace, Defence and Marine
Related Grants:
Panel History:  
Summary on Grant Application Form
Optoelectronic distribution of microwave signals is currently under consideration as a method of extending the coverage of mobile communications networks. In particular, within a building where reception can be poor, a local transmitter would cover the offices etc, to form a picocell. The major limitation to this approach lies with the photodiode, where saturation effects limit the amount of power which can be delivered. The current solution is to use in-line microwave amplifiers, after the photodiode, to boost the electrical signal, an approach which requires a large amount of electronic circuitry at each transmitter. In addition, it is vital to prevent photodiode saturation in analogue links with a high dynamic range. This proposal will address the issue of photodiode saturation by applying quantum well intermixing techniques to grade the absorption properties along the length of a GaAs/AlGaAa waveguide photodiode. In this way, a more uniform carrier distribution will be generated and the effects of saturation will be minimised. Monolithic integration techniques will be used to produce a device which can be efficiently coupled to a fibre and hybrid integration to produce a device which is efficiently heat sunk and has pre-defined v-grooves for fibre alignment. This research project is aimed at developing efficient, fast, high linearity, wide bandgap photodetectors. Such photodiodes are required for analogue fibre links with high dynamic range. One application will be in an integrated microwave transmitter module for an optoelectronic microwave distribution system. Direct beneficiaries would include DERA and GMMT. The integrated design of the photodiode will also have applications in civil and military analogue fibre systems and in telecommunications. Such photodiodes will benefit companies such as BT, HP and Nortel. More generally, all users of cellular phones will benefit from picocell technologies which enhance channel reuse and allow wireless telephony to be used in localised areas.
Key Findings
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
Potential use in non-academic contexts
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
Description This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
Date Materialised
Sectors submitted by the Researcher
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
Project URL:  
Further Information:  
Organisation Website: http://www.gla.ac.uk