Optical network system using wavelength channels included in O-band

A data reception method performed by an optical line terminal (OLT), the data reception method comprising:

• performing a connection to an optical network unit (ONU);
• and
• receiving data from the ONU via at least one of wavelength channels used for an optical transmission between the OLT and the ONU,
• wherein the wavelength channels comprise a plurality of upstream channels that are used for an upstream transmission from the ONU to the OLT and a plurality of downstream channels that are used for a downstream transmission from the OLT to the ONU,
• wherein the wavelength channels do not overlap each other,
• wherein a center wavelength of the upstream channels is shorter than a center wavelength of the downstream channels, and
• wherein an upstream channel with a longest wavelength among the plurality of upstream channels is allocated in a zero dispersion window.

A data transmission method performed by an optical network unit (ONU), the data transmission method comprising:

• identifying data that is to be transmitted to an optical line terminal (OLT) connected to the ONU;
• and
• transmitting the data to the OLT via at least one of wavelength channels used for an optical transmission between the OLT and the ONU,
• wherein the wavelength channels comprise a plurality of upstream channels that are used for an upstream transmission from the ONU to the OLT and a plurality of downstream channels that are used for a downstream transmission from the OLT to the ONU,
• wherein the wavelength channels do not overlap each other,
• wherein a center wavelength of the upstream channels is shorter than a center wavelength of the downstream channels, and
• wherein an upstream channel with a longest wavelength among the plurality of upstream channels is allocated in a zero dispersion window.