Details of Grant 

EPSRC Reference:	GR/S14474/01
Title:	Highly Efficient Integrated Optical Wavelength Converter
Principal Investigator:	Yu, Professor S
Other Investigators:
Researcher Co-Investigators:
Project Partners:
Department:	Electrical and Electronic Engineering
Organisation:	University of Bristol
Scheme:	First Grant Scheme Pre-FEC
Starts:	01 July 2003	Ends:	31 December 2005	Value (£):	119,213
EPSRC Research Topic Classifications:	Optical Devices & Subsystems
EPSRC Industrial Sector Classifications:	Electronics
Related Grants:
Panel History:
Summary on Grant Application Form
The project will investigate wavelength converter devices utilising the non-linear response of active verticle couplers (AVC) comprising an optical gain layer and a passive waveguide layer. Initial studies show that AVC structure can embody a number of physical effects inciduing XGM, XPM, as well as index and gain-induced de-coupling in a simple, compact and easy-to-make device, yet resulting in efficient wavelength converters with extinction ratio of >25dB and reduced input data power compared to simple SOAs. The project will extend existing computer models for linear AVC devices to study the effects caused by carrier density depletion in the devices, and to optimise device designs for different data injection (into active or passive waveguide), CW wavelength propagation (co-propagation and counter-propagation), and CW wavelength transmission (passive-passive, passive-active, and active-active) schemes. Integrated device structures will be designed and fabricated with optical ports giving access to the passive and active waveguide layers, allowing demonstrations and evaluations of all possible operational modes. Wavelenth conversion performances (extinction ratio, input data power sensitivity) and signal quality (optical signal to noise ratio, distortion etc) under various will be evaluated and improved by iterative optimisation of the coupler paramters including active layer structure, coupler waveguide profile and coupler length. Systems transmission demonstrations will be carried out and penalties be assessed.
Key Findings
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Organisation Website:	http://www.bris.ac.uk