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. 29, 2003
Filed:
Apr. 19, 2001
Keisuke Asami, Kanagawa, JP;
Ando Electric Co., Ltd., Tokyo, JP;
Abstract
A wavelength-variable light source equipped with a semiconductor laser , one end of which is provided with an antireflection coating A, is equipped with a power correction filter which permits transmission of the light output from the semiconductor laser , thereby rendering the characteristics of the output light substantially flat. The wavelength-variable light source is an external-resonator-type laser light source which converts the light output from the end face covered with the antireflection coating A of the semiconductor laser into collimated light, subjects the light to wavelength selection by a wavelength selection optical element , returns the light to the wavelength selection optical element by means of a mirror , to thereby subject the light again to wavelength selection by the wavelength selection optical element , feeds the light back to the semiconductor laser , and converges and outputs light output from the other end face of the semiconductor laser on and to an optical fiber . The power correction filter is interposed between the semiconductor laser and the optical fiber