Crosstalk reduction in optical networks using variable subcarrier power levels
AssigneeFujitsu Limited
InventorsOlga Vassilieva, Motoyoshi Sekiya
Life of this patent
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Abstract
A method and system for reducing crosstalk among subcarriers of a super-channel may involve adjusting power levels of the subcarriers. In one example, power levels of edge and/or intermediate subcarriers may be reduced relative to center subcarriers in the super-channel band. The adjustment in power level may lead to overall reduction in optical signal-to-noise ratio degradation.
Claims21
A method of reducing crosstalk among subcarriers of a super-channel, the method comprising:
- receiving a plurality of data streams for transmission over an optical transport network as the super-channel, the super-channel comprising a plurality of subcarrier bands, wherein each of the plurality of subcarrier bands is comprised of a plurality of subcarriers;
- assigning optical frequencies to the subcarrier bands;
- adjusting power levels, respectively, for at least some of the subcarrier bands, wherein at least two subcarrier bands have different power levels;
- optically modulating the data streams into the subcarrier bands using the assigned optical frequencies and the adjusted power levels;
- and combining the subcarrier bands into the super-channel.
An optical transport network for reducing crosstalk among subcarriers of a super-channel, comprising:
- a control plane system including a processor configured to access non-transitory computer readable memory media, wherein the memory media store processor-executable instructions, the instructions, when executed by the processor, cause the processor to:
- identify a plurality of data streams for transmission over an optical transport network as the super-channel, the super-channel comprising a plurality of subcarrier bands, wherein each of the plurality of subcarrier bands is comprised of a plurality of subcarriers;
- assign optical frequencies to the subcarrier bands;
- determine adjusted power levels, respectively, for at least some of the subcarrier bands, wherein at least two subcarrier bands have different power levels;
- and
- send an instruction to at least one element in the optical transport network to:
- optically modulate the data streams into the subcarrier bands using the assigned optical frequencies and the adjusted power levels;
- and
- combine the subcarrier bands into the super-channel.
A control plane system for reducing crosstalk among subcarriers of a super-channel in an optical transport network, the control plane system for:
- identifying a plurality of data streams for transmission over an optical transport network as the super-channel, the super-channel comprising a plurality of subcarrier bands, wherein each of the plurality of subcarrier bands is comprised of a plurality of subcarriers;
- assigning optical frequencies to the subcarrier bands;
- determining adjusted power levels, respectively, for at least some of the subcarrier bands, wherein at least two subcarrier bands have different power levels;
- and
- sending an instruction to at least one element in the optical transport network for:
- optically modulating the data streams into the subcarrier bands using the assigned optical frequencies and the adjusted power levels;
- and
- combining the subcarrier bands into the super-channel.
Dependencies are inferred from the claim text.