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:
Dec. 25, 2012
Filed:
Jan. 18, 2008
Juhyun Yu, Hitachi, JP;
Ryuta Takahashi, Hitachi, JP;
Noribumi Kobayashi, Kitaibaraki, JP;
Seiji Maruo, Hitachi, JP;
Hiroki Katayama, Hitachi, JP;
Yuuki Naganuma, Hitachi, JP;
Juhyun Yu, Hitachi, JP;
Ryuta Takahashi, Hitachi, JP;
Noribumi Kobayashi, Kitaibaraki, JP;
Seiji Maruo, Hitachi, JP;
Hiroki Katayama, Hitachi, JP;
Yuuki Naganuma, Hitachi, JP;
Hitachi Cable, Ltd., Tokyo, JP;
Abstract
There is provided a filter assembly for combining a wavelength multiplexed optical signal by multiplexing optical signals of different wavelength emitted from respective optical devices, and/or for dividing a wavelength multiplexed optical signal into optical signals of different wavelength and causing the optical signals of different wavelength to enter respective optical devices. This filter assembly comprises: a light transmitting member within which each optical signal propagates; plural optical filters disposed on an upper face of the light transmitting member at a predetermined spacing wherein each optical signal passes through the optical filters; upper reflective layers respectively provided between adjacent ones of the optical filters; and a lower reflective layer provided on a lower face of the light transmitting member, and wherein the wavelength multiplexed optical signal propagates along the same optical path within the light transmitting member.