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:
Feb. 10, 2004
Filed:
Nov. 28, 2001
Koichi Miyazaki, Tokyo, JP;
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
The invention provides a method for efficiently performing the alignment work of a laser diode chip with an optical fiber. A laser diode chip is faced to a coupling end face of a lensed fiber. According to algorisms stored inside an algorism storage part, X, Y and Z stages move the lensed fiber for alignment. The lensed fiber takes in laser light as it is moved in the optical axis direction (Z-axis direction) of the laser light from the laser diode chip. The lensed fiber is moved in the Z-axis direction by every movement, a half of a wavelength of the laser light, on the basis of the reference position thereof. Every time at the step moving, a light power of the laser light incident into the lensed fiber is measured. A position where the measured value becomes the maximum or a neighboring position thereof is defined as the optimum position of the optical fiber in the Z-axis direction. After rough alignment by whirl alignment, the optimum position of the optical fiber on the XY plane is determined by microalignment according to a five-point alignment method.