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:
Aug. 17, 2004
Filed:
Oct. 24, 2001
Applicant:
Inventor:
Minoru Toyama, Osaka, JP;
Assignee:
Nippon Sheet Glass Co., Ltd., Osaka, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 6/42 ; G02B 6/32 ; G02B 3/02 ;
U.S. Cl.
CPC ...
G02B 6/42 ; G02B 6/32 ; G02B 3/02 ;
Abstract
A light source-optical fiber coupler using a gradient index rod lens by which a diffused luminous flux emitted from a light source (for example, a semiconductor laser ) is coupled onto an end surface of an optical fiber (for example, a single-mode optical fiber ). The gradient index rod lens has a planar end surface facing the light source, and a convex spherical end surface facing the optical fiber. The gradient index rod lens has a light source side numerical aperture NA in a range of from 0.40 to 0.75, an effective lens radius r in a range of from 0.3 to 1.0 mm, and a spherical curvature radius R in a range of from 1.2 to 2.0 mm.