Method and apparatus for an optical transceiver

An optical transceiver, comprising:

• a first optical time domain reflectometer (OTDR) module configured to:
• generate a first OTDR signal, and
• generate a second OTDR signal, the second OTDR signal being a delayed version of the first OTDR signal;
• and
• a first optical supervisory channel (OSC) transmitter configured to:
• generate a first OSC signal,
• generate a second OSC signal, the second OSC signal being a delayed version of the first OSC signal,
• interleave the first OSC signal and the first OTDR signal, and
• interleave the second OSC signal and the second OTDR signal;
• a first wavelength division multiplexer (WDM) configured to transmit the first OSC signal interleaved with the first OTDR signal on a first optical fiber;
• and
• a second WDM configured to transmit the second OSC signal interleaved with the second OTDR signal on a second optical fiber;
• wherein, at any time during operation of the optical transceiver, at least one of the first and second OSC signals is present on a corresponding one of the first and second optical fibers.