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:
Apr. 26, 2016
Filed:
Nov. 28, 2012
Jeong Soo Kim, Chungcheongnam-do, KR;
Jeong Soo Kim, Chungcheongnam-do, KR;
PHOVEL. CO. LTD, Daejeon, KR;
Abstract
The present invention relates to a wavelength-tunable laser apparatus which can measure a wavelength in a wavelength-tunable laser diode package structure for dense wavelength division multiplexing (DWDM) having a transistor outline (TO) type appearance. The wavelength-tunable laser apparatus of the present invention is a TO-can type wavelength-tunable laser apparatus comprising: a laser diode chip for emitting a laser beam; a collimator lens for collimating the laser beam; a wavelength-selective filter through which the selected wavelength passes; and a reflecting mirror having an inclined reflective surface, wherein the laser beam is split into a beam which is emitted from the laser diode chip (), collimated by the collimator lens () and emitted through a 45-degree reflective mirror () to the outside of a TO-can type package, and a beam which passes through the 45-degree reflective mirror (), the beam passing through the 45-degree reflective mirror () is split into at least two branched beams, a first photodiode () is arranged on the path of one branched beam so as to monitor the beam, and wavelength-selective filters () having variable transmittance according to the wavelengths and a second photodiode () are further arranged on the path of the other branched beam.