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:
Aug. 22, 2000
Filed:
Sep. 23, 1997
Eisaku Touma, Kawasaki, JP;
Fujitsu Limited, Kanagawa, JP;
Abstract
In a passive optical network in which a plurality of subscriber equipments are connected to central office equipment via a star coupler, non-faulty subscriber equipments are quickly recovered from a communication failure caused by a faulty subscriber equipment. A control signal of wavelength .lambda..sub.2 is wavelength-division multiplexed with a main signal of wavelength .lambda..sub.1. Using the control signal of wavelength .lambda..sub.2, the subscriber equipments are selectively deactivated from the central office equipment, and based on the recovery state during the deactivation process, the faulty subscriber equipment is located and only the faulty subscriber equipment is deactivated.