Protection of WDM-channels

Details Protection of WDM-channels Protection of WDM-channels

2005-07-05

2005-07-05

Sedighian, M. R. (Department: 2633)

Optical communications

Diagnostic testing

C398S045000, C398S067000, C398S072000

Reexamination Certificate

active

06915075

ABSTRACT:
An optical network comprises a bidirectional link connecting two nodes (1) through two optical fibers (3). Optical output signals from optical transmitters (7) in a node are provided to transponders (11) issuing optical signals of well-defined wavelengths to a power combiner (13), from which optical signals are forwarded to the other node on the respective fiber. The network can have protection for failures of various components. Thus, a spare transponder (21) can receive the optical output signals of an optical transmitter (7) in the case of a failure of an ordinary transponder (11). The spare transponder (21) is also connected to the combiner (13). The optical transmitters (7) and receivers (9) can be duplicated by providing spare transmitters (7′) and spare receivers (9′). Various arrangements can be used for connecting the output of a transmitter to an ordinary transponder or the spare transponder. For example, cross-bar switches (17, 19) can be arranged at the outputs of a pair of an ordinary transmitter and a spare transmitter and at the inputs of a pair of an ordinary receiver and a spare receiver. For a node having N−1 ordinary transmitters a N:1 switch (23) is then arranged at the input of the spare transponder (21).

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