(19)

(11)

EP 1 198 727 A1

(12)

(43) Date of publication: 24.04.2002 Bulletin 2002/17 (21) Application number: 00938428.0 (22) Date of filing: 16.06.2000

(51) International Patent Classification (IPC)7: G02B 6/16, F21V 8/00 (86) International application number: PCT/CA0000/733 (87) International publication number: WO 0079/319 (28.12.2000 Gazette 2000/52)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV MK RO SI (30) Priority: 18.06.1999 US 335744 02.03.2000 US 517433 (71) Applicant: Photonics Research Ontario Toronto,Ontario M5S 1A7 (CA)	(72) Inventors: GU, Xijia North York, Ontario M3A 2G3 (CA) TAM, Robin, Chi-Hung Thornhill, Ontario L4J 6N8 (CA) (74) Representative: Elsy, David  Withers & Rogers,Goldings House,2 Hays Lane London SE1 2HW London SE1 2HW (GB)