EPSRC logo

Details of Grant 

EPSRC Reference: GR/H42888/01
Title: OPTICAL INTERFACES FOR MODULAR SYSTEMS (OIMS)
Principal Investigator: Blood, Professor P
Other Investigators:
Researcher Co-Investigators:
Project Partners:
Pre Nexus Migration
Department: School of Physics and Astronomy
Organisation: Cardiff University
Scheme: LINK
Starts: 06 September 1992 Ends: 05 April 1996 Value (£): 103,067
EPSRC Research Topic Classifications:
Optoelect. Devices & Circuits
EPSRC Industrial Sector Classifications:
Communications
Related Grants:
Panel History:  
Summary on Grant Application Form
To design and test epitaxial structures suitable for the fabrication of low threshold current visible emitting laser diodes, with good temperature stability, and to determine the physical processes controlling the temperature stability of threshold current.Progress:Computer models have been developed for optical gain, spontaneous recombination current and extrinsic carrier leakage processes in compressively strained 670 nm (GaIn)A1P laser diodes. This has been used to design optimum structures for high temperature operation and these have been grown (by EPI Ltd), fabricated and tested. The initial optimum design was verified by these experiments and the data for threshold current as a function of temperature for various device lengths were in good agreement with the model for all the structures grown. The best structures were sent to GEC-Marconi for fabrication of packaged devices for systems use. Detailed analysis of the data showed that current leakage over the cladding layers is a problem and further designs were devised, by modelling, to reduce this component. A second generation of devices has been grown and tested, and the anticipated improvements were demonstrated. Tested wafers are available for fabrication of further packaged devices by GEC. The emphasis of the academic programme is now to do a detailed analysis of the operation of these lasers. Measurements of spontaneous emission spectra from the well and the barrier are in progress and are being analysed using the model. 3 refereed papers have been published and 5 conference presentations given.
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
Impacts
Description This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
Summary
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.cf.ac.uk