Method and system for mitigating Raman crosstalk in an Ethernet passive optical network
First Claim
1. A method for mitigating Raman crosstalk between downstream data and video transmission in an Ethernet passive optical network (EPON), wherein the EPON includes an optical line terminal (OLT) and one or more optical network units (ONU'"'"'s), the method comprising:
- transmitting a data stream from the OLT to the ONU'"'"'s on a first wavelength;
transmitting a video signal stream from the OLT to the ONU'"'"'s on a second wavelength; and
changing the bit sequence for the data stream to change the power spectral distribution (PSD) for the data stream, thereby reducing power spectral content in the frequency range where significant Raman crosstalk can occur between data and video signal streams, wherein changing the bit sequence for the data stream involves changing a standard idle pattern by lengthening the IDLE ordered sets based on the IEEE 802.3-2005 standard, thereby spreading the transmission power across a wide range of frequencies and reducing power at frequencies where significant Raman crosstalk can occur.
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Abstract
One embodiment of the present invention provides a system for mitigating Raman crosstalk between downstream data and video transmission in an Ethernet passive optical network (EPON), wherein the EPON includes an optical line terminal (OLT) and one or more optical network units (ONU'"'"'s). During operation, the system transmits a data stream from the OLT to the ONU'"'"'s on a first wavelength that is substantially at 1490 nm. The system also transmits a video signal stream from the OLT to the ONU'"'"'s on a second wavelength that is substantially at 1550 nm. The system modifies the bit sequence for the data stream to change the power spectral distribution (PSD) for the data stream, thereby reducing power spectral content in the frequency range where significant Raman crosstalk can occur between data and video signal streams.
19 Citations
18 Claims
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1. A method for mitigating Raman crosstalk between downstream data and video transmission in an Ethernet passive optical network (EPON), wherein the EPON includes an optical line terminal (OLT) and one or more optical network units (ONU'"'"'s), the method comprising:
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transmitting a data stream from the OLT to the ONU'"'"'s on a first wavelength; transmitting a video signal stream from the OLT to the ONU'"'"'s on a second wavelength; and changing the bit sequence for the data stream to change the power spectral distribution (PSD) for the data stream, thereby reducing power spectral content in the frequency range where significant Raman crosstalk can occur between data and video signal streams, wherein changing the bit sequence for the data stream involves changing a standard idle pattern by lengthening the IDLE ordered sets based on the IEEE 802.3-2005 standard, thereby spreading the transmission power across a wide range of frequencies and reducing power at frequencies where significant Raman crosstalk can occur. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for mitigating Raman crosstalk between downstream data and video transmission in an EPON, wherein the EPON includes an OLT and one or more ONU'"'"'s, the system comprising:
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a first transmission mechanism configured to transmit a data stream from the OLT to the ONU'"'"'s on a first wavelength; a second transmission mechanism configured to transmit a video signal stream from the OLT to the ONU'"'"'s on a second wavelength; and a modification mechanism configured to change the bit sequence for the data stream to change the power spectral distribution (PSD) for the data stream, thereby reducing power spectral content in the frequency range where significant Raman crosstalk can occur between data and video signal streams, wherein while changing the bit sequence for the data stream, the modification mechanism is configured to change a standard idle pattern by lengthening the IDLE ordered sets based on the IEEE 802.3-2005 standard, thereby spreading the transmission power across a wide range of frequencies and reducing power at frequencies where significant Raman crosstalk can occur. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification