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:
Dec. 08, 1992
Filed:
Nov. 27, 1991
Shigeru Ohshima, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
In an optical coupler of this invention, second and third single mode optical fibers are arranged to be parallel with each other with a first single mode optical fiber intervening therebetween, and a region in which the second and third optical fibers are linearly symmetrical with each other about the first optical fiber as the center is distribution-coupled. The coupling length of distributed coupling is set such that when the first and second light waves having a wavelength .lambda.1 and a wavelength .lambda.2 different from the wavelength .lambda.1 are incident on one port of the first optical fiber, the first light wave is emitted from the other port of the first optical fiber and the second light wave is emitted from the second and third optical fibers.