Optical multiplex loop system

Application Number: 00107734
Application Date: 2000.05.24
Publication Number: 1275006
Publication Date: 2000.11.29
Priority Information: 1999/5/24 JP 143859/1999
International: H04B1/74;H04J14/02
Applicant(s) Name: NEC Corp.
Inventor(s) Name: Yoshifuji Hiroki;Iida Shuichi;Yamazaki Takashi
Patent Agency Code: 11021
Patent Agent: zhu jingui
Abstract An optical ring system having: a wavelength demultiplexer to which wavelength-multiplexed optical signal to be sent through an optical fiber from a previous node of multiple nodes is input and in which optical signal with each wavelength assigned to itself is demultiplexed; an optical ring device which is disposed in a predetermined node of the multiple nodes and which is composed of a failure existence judging part which terminates an overhead of each optical signal and judges whether a failure occurs in regard to a wavelength in a previous section, when the occurrence of failure, selects a path that allows optical signal with the wavelength to be transmitted to the previous node while avoiding the previous section incurring the failure; and a wavelength multiplexer which multiplexes optical signal to be output from the optical ring part and then outputs it to an optical fiber connected to a next node.