Method and apparatus for ranging new optical network unit in passive optical network system without impacting traffic of ranged optical network unit

A method for a first optical transceiver to range one of a plurality of second optical transceivers comprising:

• broadcasting a first ranging grant including a delay request to unranged second optical transceivers among the plurality of second optical transceivers, the delay request indicating a first delay before the unranged second optical transceivers respond to the first ranging grant such that the unranged second optical transceivers respond after a desired delay;
• determining whether a runt response is received in a quiet window established by the first optical transceiver, the quiet window being a time when no responses are expected from ranged second optical transceivers among the plurality of second optical transceivers;
• changing one of the desired delay or a timing of the quiet window in response to determining that no runt response was received in the quiet window;
• repeating the broadcasting and the determining in response to determining that no runt response was received in the quiet window;
• identifying one of the unranged second optical transceivers in response to determining that a runt response was received;
• and
• establishing a ranged state with the identified one of the unranged second optical transceiver.

A method comprising:

• receiving, from a network transceiver, a first ranging grant including a delay request at an optical transceiver, the delay request indicating a first delay before the optical transceiver responds to the first ranging grant such that the optical transceiver responds after a desired delay;
• determining the desired delay based on the delay request;
• sending a runt response after the desired delay with a laser of the optical transceiver, the runt response being sent with a laser power of the laser being below a normal laser power such that the runt response does not substantially interfere with communication with other optical transceivers;
• receiving, from a the network transceiver, a second ranging grant including an additional condition for response based on an identifier of the optical transceiver;
• sending the runt response in response to the identifier meeting the additional condition;
• and
• establishing a ranged state with the network transceiver.

A first optical transceiver comprising:

• a memory storing computer readable instructions;
• and
• a processor configured to execute the computer readable instructions,
• wherein the computer readable instructions, executed by the processor, cause the first optical transceiver to,
• broadcast a first ranging grant including a delay request to unranged second optical transceivers among a plurality of second optical transceivers, the delay request indicating a first delay before the unranged second optical transceivers respond to the first ranging grant such that the unranged second optical transceivers respond after a desired delay,
• determine whether a runt response is received in a quiet window established by the first optical transceiver, the quiet window being a time when no responses are expected from ranged second optical transceivers among the plurality of second optical transceivers,
• change one of the desired delay or a timing of the quiet window in response to determining that no runt response was received in the quiet window,
• repeat the broadcasting and the determining in response to determining that no runt response was received in the quiet window,
• identify one of the unranged second optical transceivers in response to determining that a runt response was received, and
• establish a ranged state with the identified one of the unranged second optical transceiver.

An optical transceiver comprising:

• a memory storing computer readable instructions;
• and
• a processor configured to execute the computer readable instructions,
• wherein the computer readable instructions, executed by the processor, cause the optical transceiver to,
• receive, from a network transceiver, a first ranging grant including a delay request at the optical transceiver, the delay request indicating a first delay before the optical transceiver responds to the first ranging grant such that the optical transceiver responds after a desired delay,
• determine the desired delay based on the delay request,
• sending a runt response after the desired delay with a laser of the optical transceiver, the runt response being sent with a laser power of the laser being below a normal laser power such that the runt response does not substantially interfere with communication with other optical transceivers,
• receive, from the network transceiver, a second ranging grant including an additional condition for response based on an identifier of the optical transceiver,
• sending the runt response in response to the identifier meeting the additional condition, and
• establish a ranged state with a the network transceiver.