| 摘要 |
PURPOSE: A bidirectional WDM(Wavelength Division Multiplex) add/drop self-recovery ring-shaped metro network is provided to perform self-recovery using only one optical fiber without a specific optical switch on a transmission line when a WDM optical signal is bidirectionally transmitted in a CO(Central Office) and each RN(Remote Node) and the fault of a system is generated. CONSTITUTION: One CO and a plurality of RNs(RN1-RN3) are composed in the bidirectional WDM add/drop self-recovery ring-shaped metro network. Nodes are connected by a ring-shaped type through one optical fiber(1) for bidirectionally transmitting and receiving an optical signal. Each RN(RN1-RN3) is embodied as a BADM(Bidirectional Add/Drop Multiplexer) so that a specific wavelength signal is dropped and added in each RN(RN1-RN3).
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