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. 12, 1994
Filed:
Jun. 02, 1992
Eisuke Sasaoka, Kanagawa, JP;
Masumi Fukuma, Kanagawa, JP;
Hiroaki Takimoto, Kanagawa, JP;
Hiroshi Suganuma, Kanagawa, JP;
Hiroshi Yokota, Kanagawa, JP;
Junichi Yoshikawa, Kanagawa, JP;
Kazuhiko Arimoto, Tokyo, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Sumiden Opcom, Ltd., Tokyo, JP;
Abstract
In an optical fiber coupler fabricating process where couplers are successively formed by heating, elongating and cutting a plurality of long optical fibers, light is led into the first end of the fiber, reflected at the second end of the coupler, and the reflected light is monitored by photodetectors. In this manner, an exact splitting ratio can be obtained. Techniques for minimizing measuring errors caused by the inter-reflected-light interference, the inter-Rayleigh-scattering-light interference, and the interference between the reflected light and the Rayleigh scattering light, while exploiting the advantageous feature of the reflection monitor method that the fiber connection work for each fiber coupler fabrication is not required are disclosed.