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. 10, 2007
Filed:
Oct. 18, 2002
Applicants:
Hiroki Ikeda, Tachikawa, JP;
Shigeki Kitajima, Kawasaki, JP;
Shoichi Hanatani, Saitama, JP;
Inventors:
Assignee:
Hitachi America, Ltd, Brisbane, CA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G02F 1/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A network is protected against interruption of service while one or more faulty switches or optical fiber transmission lines are repaired or replaced, by an interconnecting configuration of small N×N optical input/output switches, where N is 2 or greater than 2. The switches are configured among protection and working transmission lines. The small number of fibers for each switch improves repair and installation connection reliability and permits configurations that flexibly meet differing requirements. Also the fault is monitored with a fault check signal.