Patent ID: 8364039

Claim:
An optical network, comprising: an optical fiber; and a remote node (RN), for receiving a continuous carrier wave from the optical fiber and modulating the continuous carrier wave to generate a first frequency offset carrier wave and a second frequency offset carrier wave, wherein a frequency of the first frequency offset carrier wave is smaller than a frequency of the continuous carrier wave, a frequency of the second frequency offset carrier wave is greater than the frequency of the continuous carrier wave; a first user device re-modulates and loads data to the first frequency offset carrier wave to generate a first upstream signal, a frequency of the first upstream signal is the same as the frequency of the first frequency offset carrier wave, and the RN inputs the first upstream signal into the optical fiber; a second user device re-modulates and loads data to the second frequency offset carrier wave to generate a second upstream signal, a frequency of the second upstream signal is the same as the frequency of the second frequency offset carrier wave, and the RN inputs the second upstream signal into the optical fiber.