Long distance multi-mode communication
AssigneeFuturewei Technologies, Inc.
InventorsFrank Effenberger, Ning Cheng
Life of this patent
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Abstract
An optical line terminal (OLT) comprising a receiver configured to couple to a mode coupler via a multi-mode optical fiber that supports more than one optical communication mode, and couple to a plurality of optical network units (ONUs) via the mode coupler, a processor coupled to the receiver and configured to schedule upstream multi-mode transmissions from the ONUs via the multi-mode fiber and the mode coupler by employing time division multiplexing (TDM), and a transmitter coupled to the processor and configured to transmit schedule data to the ONUs.
Claims18
An optical line terminal (OLT) comprising:
- a receiver configured to:
- couple to a mode coupler via a multi-mode optical fiber that supports more than one optical communication mode;
- and
- couple to a plurality of optical network units (ONUs) via the mode coupler;
- a processor coupled to the receiver and configured to schedule upstream multi-mode transmissions from the ONUs via the multi-mode fiber and the mode coupler by employing time division multiplexing (TDM) or time division multiple access (TDMA);
- and
- a transmitter coupled to the processor and configured to transmit schedule data to the ONUs,
- wherein ONU transmissions are scheduled based on ONU transmission power level,
- wherein the processor is further configured to measure intermodal crosstalk between the ONUs, and
- wherein scheduling upstream multi-mode transmissions comprises:
- scheduling ONUs with primarily preceding intermodal crosstalk into adjacent time slots;
- and
- scheduling ONUs with primarily succeeding intermodal crosstalk into adjacent time slots.
A method implemented in an optical line terminal (OLT) comprising:
- communicating with a plurality of optical network units (ONUs) using time division multiplexing (TDM) or time division multiple access (TDMA) for upstream optical signals traversing a mode coupler and a multi-mode optical fiber that supports more than one optical communication mode, wherein the multi-mode fiber traversed by the upstream optical signals comprises a continuous span of the multi-mode optical fiber with a length greater than one kilometer;
- measuring the upstream optical signals from the ONUs to determine power levels exhibited by the upstream optical signals;
- measuring intermodal crosstalk between the ONUs;
- scheduling upstream communication timeslots for the ONUs such that upstream optical signals are arranged in time order based on power level, wherein scheduling upstream communication timeslots comprises:
- scheduling ONUs with preceding intermodal crosstalk into adjacent time slots;
- and scheduling ONUs with succeeding intermodal crosstalk into adjacent time slots;
- and
- transmitting schedule data to the ONUs.
An optical line terminal (OLT) comprising:
- a receiver configured to:
- couple to a plurality of optical network units (ONUs) via a multi-mode optical fiber that supports more than one optical communication mode, a mode coupler, and a plurality of single mode optical fibers;
- receive upstream data signals from the ONUs via the multi-mode optical fiber, wherein the upstream data signals are received in a plurality of modes, wherein the upstream data signals are not received simultaneously regardless of data signal mode, and wherein the received upstream data signals are received over a continuous span of the multi-mode optical fiber with a length greater than five hundred meters;
- and
- separate the upstream data signals into a plurality of data streams corresponding to each transmitting ONU;
- and
- a processor coupled to the receiver and configured to:
- determine intermodal crosstalk between the ONUs;
- and
- schedule ONU transmissions based on ONU transmission power level,
- wherein scheduling ONU transmissions based on ONU transmission power level comprises:
- scheduling ONUs with preceding intermodal crosstalk into adjacent time slots;
- and
- scheduling ONUs with succeeding intermodal crosstalk into adjacent time slots.
Dependencies are inferred from the claim text.