Precision time transfer over optical fiber

A method of synchronizing a clock at a client that is connected to a server through an optical fiber link, said method comprising the steps of:

• transmitting bursts of timing information from the server to the client, wherein the bursts from the server to the client are transmitted over a first wavelength channel of the optical fiber link;
• and
• at the client, upon receiving each burst from the server, transmitting a burst response after a predetermined amount of time has elapsed since receipt of the server burst, wherein the burst responses from the client to the server are transmitted over a second wavelength channel of the optical fiber link that is different from the first wavelength channel;
• and
• aligning the clock based on timing information contained in the server bursts and the burst responses, and differences in transmission speeds of the first and second wavelength channels.

A method of determining transit delays through an optical fiber link that connects a client and a server, said method comprising the steps of:

• determining an asymmetry in the transmission speeds through the optical fiber link using a DTI synchronization method;
• transmitting timing information between the server and the client;
• and
• determining a transit delay between the server and the client based on the transmitted timing information and the determined asymmetry.