(19)

(11)

EP 0 634 025 A1

(12)

(43) Date of publication: 18.01.1995 Bulletin 1995/03 (21) Application number: 93907651.0 (22) Date of filing: 02.04.1993

(51) International Patent Classification (IPC):  G02B 27/ 28( . ) H04B 10/ 24( . ) G02F 1/ 09( . ) (86) International application number: PCT/AU1993/000146 (87) International publication number: WO 1993/020475 (14.10.1993 Gazette 1993/25)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 03.04.1992 AU 19920001713 (71) Applicant: AUSTRALIAN AND OVERSEAS TELECOMMUNICATIONS CORPORATION LIMITED Sydney, NSW 2000 (AU)	(72) Inventors: FRISKIN, Steven, James Coogee, NSW 2034 (AU) BETTS, Ralph, Alexander Randwick, NSW 2031 (AU) (74) Representative: Meddle, Alan Leonard  FORRESTER & BOEHMERT Franz-Joseph-Strasse 38 D-80801 München D-80801 München (DE)