The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 08, 1983
Filed:
Oct. 29, 1980
Applicant:
Inventor:
Philip W Black, Bishop's Stortford, GB;
Assignee:
International Standard Electric Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
350 9633 ; 65-312 ; 65-313 ;
Abstract
A secure optical fibre consists of an inner waveguiding structure surrounded by an outer waveguiding structure and separated therefrom by an optical absorbing layer (3) rendered absorbing by irradiation. The inner waveguiding structure comprises a core (1) surrounded by a lower refractive index cladding layer (2). The outer waveguiding structure comprises an annular core layer (5) sandwiched between lower refractive index inner and outer cladding layers (4 and 6).