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:
May. 15, 2007
Filed:
Jul. 28, 2005
Applicants:
Yasuyuki Fukashiro, Yokohama, JP;
Hiroyuki Nakano, Yokohama, JP;
Tetsuya Uda, Yokohama, JP;
Tooru Hirai, Yokohama, JP;
Inventors:
Yasuyuki Fukashiro, Yokohama, JP;
Hiroyuki Nakano, Yokohama, JP;
Tetsuya Uda, Yokohama, JP;
Tooru Hirai, Yokohama, JP;
Assignee:
Hitachi Communication Technologies, Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 6/34 (2006.01); H04B 10/12 (2006.01);
U.S. Cl.
CPC ...
Abstract
A dispersion compensating fiber whose chromatic dispersion is positive and a negative dispersion compensating fiber whose chromatic dispersion is negative are prepared, and division-multiplexed optical signals, after being guided to either dispersion compensating fiber to once shift the whole wavelength band to positivity or negativity, are subjected to fine adjustment with a dispersion compensating fiber of a reverse sign.