Systems and methods for activating multi-rate optical network units in optical networks

A method for activating optical network units of an optical network, comprising:

• communicating with a plurality of optical network units (ONUs) by an optical line terminal (OLT), the plurality of ONUs including at least a multi-rate ONU configured to support both a first data rate and a second data rate compatible with an optical protocol for the optical network, wherein the first data rate is lower than the second data rate;
• defining, by the OLT, a quiet window for ONU discovery;
• transmitting, by the OLT, a first message having an allocation identifier that identifies the first data rate for the quiet window for ONU discovery;
• receiving, by the OLT during the quiet window for ONU discovery, a second message transmitted by the multi-rate ONU at the first data rate in response to the first message;
• assigning, by the OLT, a network identifier to the multi-rate ONU in response to the second message;
• performing, by the OLT, a ranging process with the multi-rate ONU subsequent to the quiet window for ONU discovery;
• receiving, by the OLT during the ranging process, a third message transmitted from the multi-rate ONU;
• and
• controlling, by the OLT, the multi-rate ONU to transmit the third message at the second data rate.