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:
Oct. 30, 2007
Filed:
Nov. 19, 2004
Jiro Shinkai, Yokohama, JP;
Takashi Kato, Yokohama, JP;
Toshio Takagi, Yokohama, JP;
Hiroyuki Yabe, Yokohama, JP;
Jiro Shinkai, Yokohama, JP;
Takashi Kato, Yokohama, JP;
Toshio Takagi, Yokohama, JP;
Hiroyuki Yabe, Yokohama, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
The object of the present invention is to provide an optical module for the WDM communication system, in which the oscillation wavelength is on the grid of the WDM regulation, moreover the optical output power and the oscillation wavelength can be controlled independently. The present module comprises a semiconductor light-emitting device, a wedge shaped etalon device and two light-receiving devices. The etalon device contains a first portion, on which the anti-reflection films are coated, and a second portion. One of the receiving devices detects light transmitted through the first portion of the etalon device, while the other device detects light through the second portion. Signal from the former device controls the output power of the light-emitting device, while the signal from the latter receiving device controls the oscillation wavelength of the laser.