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:
Jan. 04, 2000
Filed:
Mar. 20, 1997
Haruki Koyanagi, Tokyo, JP;
Tatsuo Hatta, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A laser diode module provides methods for coupling laser light and optical fiber which achieve a higher coupling efficiency than conventional methods and is cheaper and easier to assemble without losing conventional high-frequency power supply function. In a laser diode module, a high-frequency electric line 11 to a laser diode is located on the upper surface of a photodiode carrier 4 for supporting a photodiode 3; the photodiode carrier 4 is large with a trapezoidal shape. This shape prevents the surface of the photodiode 3 from returning to the laser diode reflected light emitted from the rear of the laser diode 1. A spherical convexo-plane lens 27 is located so that its spherical surface faces the laser diode 1 and is held on a lens holder 22 with a cylindrical hole at an optimum angle to a slant end of an optical fiber core 23 so that a center of curvature 29 of the spherical surface is on an optical axis 19 of laser light which is collimated by a collimating lens 7.