Chromatic dispersion pre-compensation over bi-directional optical link

A transceiver for transmitting and receiving optical signals from another transceiver through an optical link, the transceiver being configured to generate chromatic dispersion (CD) pre-compensated optical signals by applying CD pre-compensation filters (PCD filters) to a plurality of signals, and to send the CD pre-compensated optical signals through the optical link, the transceiver being further configured to:

• receive a first CD pre-compensated optical signal and a second CD pre-compensated optical signal from the other transceiver through the optical link, the first CD pre-compensated optical signal being generated by the other transceiver by applying a first PCD filter to a first signal, the second CD pre-compensated optical signal being generated by the other transceiver by applying a second PCD filter to a second signal;
• calculate a first residual chromatic dispersion value (RCD value) from the received first CD pre-compensated optical signal;
• calculate a second RCD value from the received second CD pre-compensated optical signal;
• calculate a third PCD filter using the first RCD value;
• calculate a fourth PCD filter using the second RCD value;
• apply the third PCD filter to a third signal to generate a third CD pre-compensated optical signal;
• and
• apply the fourth PCD filter to a fourth signal to generate a fourth CD pre-compensated optical signal;
• and
• send the third and fourth CD pre-compensated optical signals to the other transceiver through the optical link,
• wherein the CD pre-compensated optical signals comprise the first, second, third and fourth CD pre-compensated optical signals,
• wherein the PCD filters comprise the first, second, third, and fourth PCD filters, and
• wherein the plurality of signals comprises the first, second, third, and fourth signals.

A transceiver for transmitting and receiving optical signals from another transceiver through an optical link, the transceiver being configured to generate chromatic dispersion (CD) pre-compensated optical signals by applying CD pre-compensation filters (PCD filter) to signals and send the CD pre-compensated optical signals through the optical link, the transceiver being further configured to:

• generate a first CD pre-compensated optical signal by applying a first PCD filter to a first signal;
• generate a second CD pre-compensated optical signal by applying a second PCD filter to a second signal;
• send the first and second CD pre-compensated optical signals to the other transceiver through the optical link;
• and
• receive a third CD pre-compensated optical signal and a fourth CD pre-compensated optical signal from the other transceiver through the optical link, the third CD pre-compensated optical signal being generated by the other transceiver by applying a third PCD filter to a third signal and the fourth CD pre-compensated optical signal being generated by the other transceiver by applying a fourth PCD filter to a fourth signal, the third PCD filter being calculated by the other transceiver by using a first residual chromatic dispersion value (RCD value) and the fourth PCD filter being calculated by the other transceiver by using a second RCD value, the first RCD value being calculated by the other transceiver from the received first CD pre-compensated optical signal and the second RCD value being calculated by the other transceiver from the received second CD pre-compensated optical signal,
• wherein the CD pre-compensated optical signals comprise the first, second, third and fourth CD pre-compensated optical signals,
• wherein the PCD filters comprise the first, second, third, and fourth PCD filters, and
• wherein the plurality of signals comprises the first, second, third, and fourth signals.