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:
May. 03, 1977
Filed:
Jan. 12, 1976
Brian S Kawasaki, Carleton Place, CA;
Derwyn C Johnson, Ottawa, CA;
Canadian Patents and Development Limited, Ottawa, CA;
Abstract
An optical coupler for a multi-mode optical fiber transmission line consisting of a first length of optical fiber and a second length of optical fiber positioned along a common axis such that one end of the second fiber is spaced a predetermined distance l from one end of the first fiber. This allows a portion of the optical energy leaving the end of first fiber to enter the second fiber. The coupler further includes a reflective surface facing the first fiber to reflect the remaining portion of the optical energy out of the coupler. The percentage of the energy reflected out of the coupler is determined by the distance l and may be varied by moving the second fiber with respect to the first. The material between the ends of the fibers has a refractive index substantially identical to the refractive index of the fiber cores to provide for greater efficiency. A second reflective surface means facing the end of the second fiber may be utilized to reflect and focus optical energy entering the coupler, into the end of the second fiber. The reflective surfaces may be planar, parabolic, spherical, ellipsoidal or any other appropriate shape.