Network managing apparatus, optical add/drop multiplexer, and network managing method

• US 20070264011A1
• Filed: 07/19/2007
• Published: 11/15/2007
• Est. Priority Date: 01/25/2005
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Kai, Yutaka, Sone, Kyosuke
• Granted Patent: US 7,643,751 B2
• Time in Patent Office: Days
• US Class Current: 398/10
• CPC Class Codes: H04J 14/0204 Broadcast and select arrangements, e.g. with an optical splitter at the input before adding or dropping
• CPC Class Codes: H04J 14/0205 Select and combine arrangements, e.g. with an optical combiner at the output after adding or dropping
• CPC Class Codes: H04J 14/0206 Express channels arrangements
• CPC Class Codes: H04J 14/021 Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
• CPC Class Codes: H04J 14/0227 Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
• CPC Class Codes: H04J 14/0246 using one wavelength per ONU
• CPC Class Codes: H04J 14/0258 Wavelength identification or labelling
• CPC Class Codes: H04J 14/0283 WDM ring architectures
• CPC Class Codes: H04J 14/0294 Dedicated protection at the optical channel (1+1)
• CPC Class Codes: H04J 14/0295 Shared protection at the optical channel (1:1, n:m)
• CPC Class Codes: H04L 12/437 Ring fault isolation or reconfiguration for SDH/SONET ring networks H04J3/085
• CPC Class Codes: H04L 41/06 Management of faults, events, alarms or notifications
• CPC Class Codes: H04L 41/0816 the condition being an adaptation, e.g. in response to network events
• CPC Class Codes: H04L 41/082 the condition being updates or upgrades of network functionality
• CPC Class Codes: H04L 43/0811 by checking connectivity

Abstract

A network managing apparatus is connected to one of multiple OADM nodes that execute optical communication on an optical ring network configured by a two-line transmission path including of an active line and a backup line. The apparatus includes a storing unit that stores arrangement information of the OADM nodes and operating wavelength information of optical signals transmitted by the nodes. A controlling unit updates the operating wavelength information retained in the storing unit based on fault information from the OADM nodes and distributes the updated operating wavelength information to the OADM nodes.

Claims

1. A network managing apparatus connected to one of a plurality of nodes that execute optical communication on an optical ring network configured with two transmission paths including an active line and a backup line, the network managing apparatus comprising:

a storing unit that stores arrangement information of the nodes and operating wavelength information of optical signals transmitted by the nodes; and

a controlling unit that updates, based on fault information received from the nodes, the operating wavelength information and distributes the updated operating wavelength information to the nodes.

2. The network managing apparatus according to claim 1, wherein

the controlling unit includes

a determining unit that determines whether the fault information indicates a simultaneous disconnection that is a state in which both the active line and the backup line are disconnected between an identical pair of nodes among the nodes;

and

an identifying unit that identifies a position of the simultaneous disconnection depending on a result of determining by the determining unit and the arrangement information.

3. The network managing apparatus according to claim 2, wherein

the fault information is a network monitoring signal that uses an optical monitoring channel.

4. The network managing apparatus according to claim 1, wherein

the controlling unit includes

a reading unit that reads, from the storing unit, the operating wavelength information of the nodes that have issued the fault information;

a judging unit that judges whether the optical signals are being transmitted by the nodes that have issued the fault information, based on the read operating wavelength information;

a determining unit that determines whether the fault information indicates a simultaneous disconnection that is a state in which both the active line and the backup line are disconnected between an identical pair of nodes among the nodes; and

an identifying unit that identifies a position of the simultaneous disconnection depending on a result of determining by the determining unit and the arrangement information.

5. The network managing apparatus according to claim 4, wherein

the fault information is an alarm generated by the nodes based on determination of an optical signal disconnection.

6. A node in an optical ring network in which a data signal and a monitoring signal are transmitted on two paths including an active line and a backup line, the node comprising:

an add-drop unit that drops a first optical signal having an arbitrary wavelength from the data signal and adds a second optical signal having a specific wavelength as the data signal;

a detecting unit that respectively detects disconnection of both the active line and the backup line; and

a notifying unit that, by a monitoring signal, notifies a network managing apparatus managing the optical ring network, of the detected disconnections.

7. The node according to claim 6, wherein

the detecting unit includes

a wavelength division multiplexing (WDM) coupler that decouples light received from the active line and the backup line into the data signal and the monitoring signal;

and

a transmitting unit that transmits the decoupled monitoring signal to the network managing apparatus.

8. The node according to claim 7, wherein

the transmitting unit includes a converting unit that performs mutual conversion between the monitoring signal and an electric signal, and

the transmitting unit electrically communicates with the network managing apparatus.

9. The node according to claim 6, wherein

the detecting unit includes a node controlling unit that monitors the data signal and reports, to the network managing apparatus, fault information based on a transmission state of the data signal.

10. A network managing method of managing an optical ring network configured by two optical transmission paths including an active line and a backup line, the network managing method comprising:

receiving fault information from a plurality of nodes on the optical ring network;

updating, based on the received fault information, arrangement information of the nodes and operating wavelength information of optical signals being transmitted by the nodes; and

distributing the updated operating wavelength information to the nodes.

11. The network managing method according to claim 10, further comprising:

determining whether the fault information indicate a simultaneous disconnection that is a state in which both the active line and the backup line are disconnected between an identical pair of nodes among the nodes; and

identifying a position of the simultaneous disconnection depending on the determining and the arrangement information.

12. The network managing method according to claim 10, further comprising:

reading the operating wavelength information of the nodes that have issued the fault information;

judging, based on the read operating wavelength information, whether an optical signal is being transmitted at the nodes;

determining whether the fault information indicate a simultaneous disconnection that is a state in which both the active line and the backup line are disconnected between an identical pair of nodes among the nodes; and

identifying a position of the simultaneous disconnection depending on the determining and the arrangement information.