Protected bidirectional WDM network

Details Protected bidirectional WDM network Protected bidirectional WDM network

2002-12-18

2008-03-11

Leung, Christina (Department: 2613)

Optical communications

Fault recovery

Bypass inoperative element

C398S059000

Reexamination Certificate

active

07343093

ABSTRACT:
An optical WDM ring network includes at least two add/drop nodes connected in a ring path. The ring path comprises only a single optical fiber arranged for bidirectional traffic between the nodes. A 2×2 switch is used in one of the add/drop nodes for switching signals forwarded from the node to the other node to travel either on a first segment of the ring path or on a second, complementary segment of the ring path when required for protection purposes. Signals from the other node to the first node are issued to travel on both segments but the switch selects the actual segment from which the signals are received in the first node. The signals switches by the switch can be high priority signals used in protected channels communicated between the node and another node. On the segment from which the high priority signals are not received, low priority signals in non-protected channels can be communicated between the nodes, these channels also passing the switch.

REFERENCES:
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patent: 5886801 (1999-03-01), Van Deventer
patent: 6321004 (2001-11-01), Duerksen et al.
patent: 6661946 (2003-12-01), Caroli et al.
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patent: 00/28670 (2000-05-01), None
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Communication pursuant to Article 96(2) EPC for European Application No. 02 793 684.8-2415, dated Jul. 10, 2006.
Japanese Patent Application No. 2003-553756, mailed Aug. 14, 2007.

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