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. 18, 2006
Filed:
Sep. 23, 2004
Yoshiaki Minakawa, Ibaraki, JP;
Tsuyoshi Maro, Ibaraki, JP;
Yoshiaki Minakawa, Ibaraki, JP;
Tsuyoshi Maro, Ibaraki, JP;
Hitachi Maxell, Ltd., Osaka, JP;
Abstract
The wavelength division multiplexer includes a single optical substrate or a plurality of optical substrates integrated together, on which the first optical filter and the second optical filter are placed. The center wavelengths of three wavelength bands, λ, and λ, satisfy: 0.92≦λ≦1.08, and 0.20≦λ≦0.92 or 1.08≦λ≦5.00. The first optical filter combines or separates light of λand two-wavelength multiplexed light of λand λ. The second optical filter combines or separates light of λand light of λ