Details of Grant 

EPSRC Reference:	GR/S70180/01
Title:	Fibre Communications Using Differential Phase Shifting-Keying Modulation Format
Principal Investigator:	Turitsyn, Professor SK
Other Investigators:	Bennion, Professor I
Researcher Co-Investigators:
Project Partners:
Department:	Sch of Engineering and Applied Science
Organisation:	Aston University
Scheme:	Standard Research (Pre-FEC)
Starts:	01 January 2004	Ends:	30 June 2005	Value (£):	67,535
EPSRC Research Topic Classifications:	Optical Communications
EPSRC Industrial Sector Classifications:	Communications
Related Grants:
Panel History:
Summary on Grant Application Form
The present application is for the support of a Visiting Fellow Dr V Grigoryan to undertake numerical modeling of advanced modulation formats realizing different implementations of return-to-zero differential phase shift keying (RZ-DPSK). The project will build upon and extend experimental and theoretical research being performed in the Photonics Research Group at Aston University by adding an important new dimension and utilising results recently derived under EPSRC support.Recently, there has been a great deal of interest in using return-to zero differential phase shift-keying (RZ-DPSK) modulation format for long-haul fiber communications. It has been demonstrated already that DPSK dramatically improves the system performance relative to the conventional on-off-key (OOK) format. There are three reasons for this. Firstly, DPSK enables balanced detection that can provide up to 3dB net improvement of the Q-factor relative to regular detection used in OOK. Secondly, DPSK allows greater tolerance to the nonlinear penalties due to the cross-phase modulation at the same signal power. Thirdly, because of the bit-to-bit binary random phase shifts, one can expect both the inter-channel and intra-channel four-wave mixing to be smaller relative to the OOK format as the tones in DPSK spectrum are suppressed. All these added Q-factor improvements can be traded-off for increased repeater spacing, longer transmission distance, and increased transmission capacity.In the proposed research, we will comprehensively analyse both the linear and nonlinear characteristics of RZ-DPSK-based WDM communication systems to determine optimal performance regimes.
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Organisation Website:	http://www.aston.ac.uk