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:
Nov. 10, 1992
Filed:
May. 21, 1991
Neil R Haigh, Eastham, GB;
BICC plc, London, GB;
Abstract
Signal attenuation caused by a coating on an optical fibre is measured by feeding a length of the coated optical fibre into an integrating sphere assembly, forming within that part of the fibre within the sphere a loop of such a diameter that there is no risk of macrobending of the fibre and feeding the optical fibre out of the sphere to a detector. Light from a source is transmitted through the fibre and the power of the transmitted signal is continuously detected. The diameter of the loop is gradually decreased to cause macrobending of the fibre F and the strength of the light radiated through the coating by the macrobend in the fibre and collected and integrated by the sphere is monitored. The attenuation by the coating of the transmitted signal is determined from the discrepancy between the reduction of power of the transmitted signal and the increase in strength of the light radiated through the coating by the macrobend.