Connectivity verification testing and topology discovery

A method of performing connectivity verification testing and topology discovery in a reconfigurable optical add/drop multiplexer (ROADM), the method comprising:

• injecting, using a test signal transmitter of a first ROADM block of a plurality of ROADM blocks, a first outgoing test signal having a first signature into a first internal port of a first plurality of internal ports and a second outgoing test signal having a second signature different from the first signature into a second internal port of the first plurality of internal ports, wherein the first outgoing test signal is out-of-band of optical data signals traversing the ROADM;
• monitoring, using a test signal monitor of the first ROADM block, for an incoming test signal at each of the plurality of internal ports, and;
• verifying, based on receiving the incoming test signal at the third internal port, that a valid first connection exists between the third internal port and a first internal port of a second plurality of internal ports of a second ROADM block, wherein the first internal port, the second internal port, and the third internal port are each connected to another ROADM block via respective optical fibers.

A non-transitory computer-readable medium having stored thereon instructions configured to cause one or more processors to execute a method of performing connectivity verification testing and topology discovery in a reconfigurable optical add/drop multiplexer (ROADM), the method comprising:

• injecting, using a test signal transmitter of a first ROADM block of a plurality of ROADM blocks, a first outgoing test signal having a first signature into a first internal port of a first plurality of internal ports and a second outgoing test signal having a second signature different from the first signature into a second internal port of the first plurality of internal ports, wherein the first outgoing test signal is out-of-band of optical data signals traversing the ROADM;
• monitoring, using a test signal monitor of the first ROADM block, for an incoming test signal at each of the plurality of internal ports, and;
• verifying, based on receiving the incoming test signal at the third internal port, whether a valid first connection exists between the third internal port and a first internal port of a second plurality of internal ports of a second ROADM block, that the first internal port, the second internal port, and the third internal port are each connected to another ROADM block via respective optical fibers.