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:
Sep. 20, 1988
Filed:
Oct. 10, 1986
M Jamil Ahmed, Maple Ridge, CA;
Microtel Limited, Vancouver, CA;
Abstract
An optical fibre interferometer particularly adapted to provide a light output that is modulated in relation to the intensity of an electromagnetic field includes a single-mode fibre of substantially non-electrooptic material (20, 22 and 24) to which has been spliced (at 26 and 28) a single-mode fibre of substantially electrooptic material (30). When the interferometer is placed in an electromagnetic field, the optical characteristics of the substantially electooptic fibre are varied, but the optical characteristics of the substantially non-electrooptic fibre are not. As a result, the light passing through the substantially non-electrooptic and electrooptic fibres undergoes a differential phase shift, causing interference upon light recombination that provides the desired light output modulation. Embodiments in which the fibre of substantially electooptic material is replaced by an optical waveguide of substantially electrooptic material, either formed separately (50, FIG. 3) or directly (70, FIG. 4 on the optical fibre itself, are discussed, as is the broad applicability of the interferometer to any situation in which an external parameter is to be measured.