Systems and methods for data center interconnects

A data center interconnect (DCI), comprising:

• a downstream (DS) transceiver array including one or more DS transceivers;
• a first comb source in operable communication with the DS transceiver array and configured to generate one or more first spaced optical tones and to transmit one optical tone of the one or more first spaced optical tones as a seed tone to a second comb source;
• an upstream (US) transceiver array including one or more US transceivers in operable communication over an optical communication medium with the one or more DS transceivers, respectively, of the DS transceiver array;
• and
• the second comb source in operable communication with the US transceiver array and configured to receive the seed tone and to generate one or more second spaced optical signals matching the one or more first spaced optical tones based on the seed tone.