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:
Jun. 25, 2002
Filed:
Jun. 09, 2000
Masahiko Namiwaka, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A semiconductor laser module includes a semiconductor laser element, a lens system for condensing laser light onto an optical fiber, a band-pass filter for transmitting laser light having a predetermined wave length, and an optical fiber. The band-pass filter is held by a mechanism for tilting the band-pass filter at a desired angle relative to the traveling direction of the laser light. A reflecting element for reflecting part of the incident laser light is provided in a wave guide of the optical fiber so that a resonator is formed between the reflecting element and the emitting end face of the semiconductor laser element. The reflecting element utilizes a difference in refractive indices of materials forming the reflecting element to provide reflection. Preferably, control of the tilting mechanism is conducted via a control unit in response to an output from a thermal sensor.