Topology determination for an optical network

1. A device in an optical network, the device comprising:

a data communication network (DCN) interface that enables the device to send and receive data on a data communication network separate from the optical network, wherein the DCN interface is configured to receive a message on the data communication network, the message including data that identifies a first device in the optical network and indicates that the first device previously received an optical pulse pattern from an optical fiber in the optical network; and

a topology unit configured to generate topology data using the message, the topology data indicating that a second device is connected in the optical network to the first device when the received optical pulse pattern matches an optical pulse pattern originated by the second device.

2. The device of claim 1 , wherein the DCN interface receives the message from the second device, the message indicating that the second device is physically connected in the optical network to the first device.

3. The device of claim 1 , wherein the DCN interface receives the message from the first device, the message indicating that the second device is physically connected in the optical network to the first device.

4. The device of claim 1 ,

wherein the DCN interface receives the message from the first device, the message including a pulse pattern descriptor that describes the optical pulse pattern received by the first device; and

wherein the topology unit is further configured to:

receive a notification message from the second device, the notification message including data that identify the second device and a pulse pattern descriptor that describes the optical pulse pattern originated by the second device; and

determine whether the optical pulse pattern received by the first device matches the optical pulse pattern originated by the second device.

5. The device of claim 4 ,

wherein the message includes a first time identifier, the first time identifier indicating a time at which the first device received the optical pulse pattern;

wherein the notification message includes a second time identifier, the second time identifier indicating a time at which the second device will send or has sent the optical pulse pattern;

wherein the topology unit is configured to determine whether the time indicated by the first time identifier corresponds to the time indicated by the second time identifier; and

wherein the topology unit generates the topology data when the received optical pulse pattern matches the optical pulse pattern originated by the second device and the time indicated by the first time identifier corresponds to the time identified by the second time identifier.

6. The device of claim 1 , wherein the topology data indicates that a port of the second device is physically connected in the optical network to a port of the first device.

7. A non-transitory computer-readable storage medium having instructions stored thereon that, when executed by a processor of a computing device in an optical network, configure the computing device to:

receive a message on a data communication network separate from the optical network, the message including data that identifies a first device in the optical network and indicates that the first device previously received an optical pulse pattern from an optical fiber in the optical network; and

generate topology data using the message, the topology data indicating that a second device is connected in the optical network to the first device when the received optical pulse pattern matches an optical pulse pattern originated by the second device.

8. The non-transitory computer-readable storage medium of claim 7 , wherein the instructions configure the computing device to receive the message from the second device, the message indicating that the second device is physically connected in the optical network to the first device.

9. The non-transitory computer-readable storage medium of claim 7 , wherein the instructions configure the computing device to receive the message from the first device, the message indicating that the second device is physically connected in the optical network to the first device.

10. The non-transitory computer-readable storage medium of claim 9 ,

wherein the DCN interface receives the message from the first device, the message including a pulse pattern descriptor that describes the optical pulse pattern received by the first device; and

wherein the instructions configure the computing device to:

receive a notification message from the second device, the notification message including data that identify the second device and a pulse pattern descriptor that describes the optical pulse pattern originated by the second device; and

determine whether the optical pulse pattern received by the first device matches the optical pulse pattern originated by the second device.

11. The non-transitory computer-readable storage medium of claim 10 ,

wherein the message includes a first time identifier, the first time identifier indicating a time at which the first device received the optical pulse pattern;

wherein the notification message includes a second time identifier, the second time identifier indicating a time at which the second device will send or has sent the optical pulse pattern;

wherein the instructions configure the computing device to determine whether the time indicated by the first time identifier corresponds to the time indicated by the second time identifier; and

wherein the instructions configure the computing device to generate the topology data when the received optical pulse pattern matches the optical pulse pattern originated by the second device and the time indicated by the first time identifier corresponds to the time identified by the second time identifier.

12. The non-transitory computer-readable storage medium of claim 9 , wherein the topology data indicates that a port of the second device is physically connected in the optical network to a port of the first device.