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:
Jul. 31, 1990
Filed:
Sep. 17, 1987
Alan J Rogers, Bookham, GB;
National Research Development Corporation, London, GB;
Abstract
Simultaneous time-variable and position-variable control of the polarization properties from any position along the length of an optical fibre, is effected by launching an acoustic disturbance into the fibre, thereby locally modifying the birefringence of the fibre. A current measurement device incorporating a monomode optical fiber 1 may be made insensitive to vibration by launching an acoustic wave from one end of the fiber. This wave 7 consists of two linearly polarized shear waves orthogonal in direction, and in phase quadrature is of such an amplitude and frequency as to provide a circular birefringence very much greater than the vibrationally-induced linear birefringence.