(19)
(11)EP 0 489 807 A1

(12)

(43)Date of publication:
17.06.1992 Bulletin 1992/25

(21)Application number: 90913127.0

(22)Date of filing:  14.08.1990
(51)International Patent Classification (IPC): 
G02B 6/ 293( . )
H04B 10/ 02( . )
H04B 10/ 207( . )
H04M 3/ 00( . )
G02B 6/ 28( . )
H04B 10/ 17( . )
H04J 14/ 02( . )
(86)International application number:
PCT/GB1990/001282
(87)International publication number:
WO 1991/003753 (21.03.1991 Gazette  1991/07)
(84)Designated Contracting States:
AT BE CH DE DK ES FR GB IT LI LU NL SE

(30)Priority: 01.09.1989 GB 19890019799

(71)Applicant: BRITISH TELECOMMUNICATIONS public limited company
London EC1A 7AJ (GB)

(72)Inventors:
  • FAULKNER, David, Wynford
    Ipswich Suffolk IP5 7SU (GB)
  • SMITH, Phillip, John
    Ipswich Suffolk IP5 7UB (GB)

(74)Representative: Semos, Robert Ernest Vickers 
BRITISH TELECOM PLC. Intellectual Property Unit 13th Floor 151 Gower Street
London WC1E 6BA
London WC1E 6BA (GB)

  


(54)OPTICAL COUPLER