(19)

(11)

EP 2 036 225 A1

(12)

(43) Date of publication: 18.03.2009 Bulletin 2009/12 (21) Application number: 07733244.3 (22) Date of filing: 15.06.2007

(51) International Patent Classification (IPC):  H04B 10/155(2006.01) H01S 3/067(2006.01) (86) International application number: PCT/GB2007/002240 (87) International publication number: WO 2007/148056 (27.12.2007 Gazette 2007/52)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR MK RS (30) Priority: 22.06.2006 GB 0612419 (71) Applicant: University of Kent Canterbury Kent CT2 7NZ (GB)	(72) Inventors: SHEN, Pengbo Canterbury Kent CT2 7NT (GB) DAVIES, Philip Anthony Canterbury Kent CT2 7NT (GB) GOMES, Nathan Joseph Canterbury Kent CT2 7NT (GB) (74) Representative: Ertl, Nicholas Justin  Elkington and Fife LLP Prospect House 8 Pembroke Road Sevenoaks Kent TN13 1XR Sevenoaks Kent TN13 1XR (GB)