Adaptive preamble adjustment for burst-mode optical systems
AssigneeAlcatel Lucent
InventorsRodger Dalton, Eugen H. Ruegg, Jason Teeter
Life of this patent
Estimating the term…
Abstract
In an optical data network, such as a passive optical network (PON), an optical line terminator (OLT) measures the strengths of one or more signals received from the optical network units (ONUs) and generates a message containing an indication responsive to the measured signal strength. The OLT transmits the message to the ONUs. The ONUs generate packets having preambles of a length responsive to the indication contained in the message.
Claims14
A method for adjusting a data transmission packet preamble length in an optical network, wherein the packet comprises a preamble followed by data bits, comprising the steps of:
- measuring a signal strength of a signal received from at least one optical network unit (ONU) in the optical network at an optical line terminator (OLT);
- and
- causing the at least one ONU to transmit a packet having a preamble with a length responsive to the measured signal strength.
A method for adjusting a data transmission packet preamble length in an optical network, wherein the packet comprises a preamble followed by data bits, comprising the steps of:
- measuring a signal strength of a signal received from at least one optical network unit (ONU) in the optical network at an optical line terminator (OLT);
- and
- causing the at least one ONU to transmit a packet having a preamble with a length responsive to the measured signal strength, wherein the step of causing the at least one ONU to transmit a packet having a preamble with a length responsive to the measured signal strength comprises:
- generating a preamble length indication responsive to the measured signal strength;
- and
- transmitting a message containing the preamble length indication from the OLT to the ONU;
- and
- the ONU generating, in response to the message, a packet having a preamble with a length indicated by the preamble length indication.
A method for adjusting a data transmission packet preamble length in a passive optical network (PON), wherein the packet comprises a preamble followed by data bits, comprising the steps of:
- measuring a signal strength at an optical line terminator (OLT) of each signal received from each ONU in the PON;
- determining a highest signal strength of among signals received from the ONUs in the PON;
- determining a lowest signal strength of among signals received from the ONUs in the PON;
- calculating a ratio of the highest signal strength to the lowest signal strength;
- determining a preamble length indication in response to the ratio;
- transmitting a message containing the preamble length indication from the OLT to each ONU in the PON;
- and
- an ONU in the PON generating, in response to the message, a packet having a preamble with a length indicated by the preamble length indication.
An optical line terminator that adjusts a data transmission packet preamble length in an optical network, wherein the packet comprises a preamble followed by data bits, comprising:
- an optical data transceiver system for receiving signals from and transmitting signals to one or more optical network units in the optical network;
- a signal strength measuring system for measuring a strength of a signal received from an optical network unit (ONU);
- and
- a processing system for determining a preamble length indication responsive to the measured signal strength, generating a message containing the preamble length indication, and causing the optical data transceiver system to transmit the message to the ONU.
Dependencies are inferred from the claim text.