System and method for low noise distribution of terahertz waves using optical fiber and noise cancellation

A system comprising:

• a local station comprising a source of optical signals, each optical signal comprising two optical frequencies having a first frequency difference in a range of 10 GHz to 10 THz;
• and
• at least one repeater station and at least one optical fiber configured to transmit the optical signals from the local station to at least one remote station, wherein the local station and/or at least one of the at least one repeater station comprises:
• a first optical circuit configured to transmit a first power fraction of the optical signals along a first optical path and to transmit a second power fraction of the optical signals along a second optical path different from the first optical path;
• a second optical circuit configured to generate a modified first power fraction by modifying the two optical frequencies of the first power fraction in response to control signals;
• and
• a third optical circuit configured to detect shifts of the two optical frequencies that are induced by propagation of the optical signals through the at least one optical fiber and to generate the control signals in response to the detected shifts.

A method for phase and frequency noise cancellation in microwave, millimeter-wave, sub-terahertz, or terahertz signals transmitted over at least one optical fiber link between a first station and at least one second station, the method comprising:

• generating optical signals comprising two separate optical frequencies having a frequency difference in a range of 10 GHz to 10 THz;
• transmitting the optical signals along an optical path through the at least one optical fiber link;
• detecting phase and frequency fluctuations at the at least one second station;
• and
• applying error correction signals to the optical signals at one or more locations along the optical path, the error correction signals comprising frequency shifts derived from the detected phase and frequency fluctuations to mitigate noise in real-time.