Downstream synchronization state machine for optical line terminal (OLT)-configurable bit interleaving in high-speed passive optical networks (PONs)
AssigneeHuawei Technologies Co., Ltd.
InventorsXiang Liu, Andy Shen, Frank Effenberger, Yuanqiu Luo
Life of this patent
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Abstract
A method implemented by an optical network unit (ONU) in a passive optical network (PON). The method includes receiving an encoded downstream (DS) signal from an optical line terminal (OLT), searching for a physical synchronization sequence (PSync) pattern in all possible alignments for all possible OLT bit-interleaving modes within the downstream signal, and transitioning to a pre-synchronization state once the PSync pattern has been found.
Claims20
A method implemented by an optical network unit (ONU) in a passive optical network (PON), the method comprising:
- receiving an encoded downstream (DS) signal from an optical line terminal (OLT);
- searching for a physical synchronization sequence (PSync) pattern in all possible alignments for all possible OLT bit-interleaving modes within the encoded DS signal, wherein the all possible OLT bit-interleaving modes comprise a non-interleaving mode and a m× bit-interleaving mode in which m adjacent forward error correction (FEC) codewords are interleaved on a bit-by-bit basis;
- and
- transitioning to a pre-synchronization state once the PSync pattern has been found.
An optical network unit (ONU) in a passive optical network (PON), the ONU comprising:
- a memory configured to store instructions;
- and
- one or more processors coupled to the memory, the one or more processors configured to execute the instructions to cause the ONU to:
- receive an encoded downstream (DS) signal from an optical line terminal (OLT);
- search for a physical synchronization sequence (PSync) pattern in all possible alignments for all possible OLT bit-interleaving modes within the encoded DS signal, wherein the all possible OLT bit-interleaving modes comprise a non-interleaving mode and a m× bit-interleaving mode in which m adjacent forward error correction (FEC) codewords are interleaved on a bit-by-bit basis;
- and
- transition to a pre-synchronization state once the PSync pattern has been found.
A passive optical network (PON), comprising:
- an optical line terminal (OLT) configured to transmit an encoded downstream (DS) signal;
- and
- an optical network unit (ONU) in communication with the OLT, wherein the ONU is configured to:
- receive the encoded DS signal from the OLT;
- search for a physical synchronization sequence (PSync) pattern in all possible alignments for all possible OLT bit-interleaving modes within the encoded DS signal, wherein the all possible OLT bit-interleaving modes comprise a non-interleaving mode and a m× bit-interleaving mode in which m adjacent forward error correction (FEC) codewords are interleaved on a bit-by-bit basis;
- and
- transition to a pre-synchronization state once the PSync pattern has been found.
Dependencies are inferred from the claim text.