Modular multiplexing/demultiplexing units in optical transmission systems
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Accused Products
Abstract
An optical transmission system includes a number of corresponding modular multiplexing and demultiplexing units used in transmitting and receiving an optical signal respectively. Additionally, compensation components compensate for optical dispersion experienced by the optical signal. The modular multiplexing and demultiplexing units are assembled in a cascade fashion at the transmit side and the receive side of the optical transmission system, respectively. The dispersion compensation components share dispersion compensation fiber across the cascaded units.
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Citations
56 Claims
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1-32. -32. (cancelled).
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33. A transmit side wavelength division multiplexer, comprising:
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a first multiplexing unit configured to receive a plurality of input channels and output a WDM signal based on the plurality of input channels;
a second multiplexing unit configured to receive at least one input channel and to receive the WDM signal output by the first multiplexing unit, and to output a WDM signal based on the at least one input channel and the WDM signal output by the first multiplexing unit, wherein the first and second multiplexing units comprise a first plurality of multiplexing units;
a first dispersion compensation fiber connected in series with the first multiplexing unit, the first dispersion compensation fiber having a length based on a length of fiber required to compensate for dispersion experienced by the input channels of the first multiplexing unit and based on succeeding dispersion compensation fibers associated with the multiplexing units;
a second dispersion compensation fiber connected in series with the second multiplexing unit, the second dispersion compensation fiber having a length based on a length of fiber required to compensate for dispersion experienced by the input channels of the second multiplexing unit and based on succeeding dispersion compensation fibers associated with the multiplexing units;
a third multiplexing unit configured to receive a plurality of input channels and output a WDM signal based on the plurality of input channels;
a fourth multiplexing unit configured to receive at least one input channel and to receive the WDM signal output by the third multiplexing unit, and to output a WDM signal based on the at least one input channel and the WDM signal output by the third multiplexing unit, wherein the third and fourth multiplexing units comprise a second plurality of multiplexing units;
a third dispersion compensation fiber connected in series with the third multiplexing unit, the third dispersion compensation fiber having a length based on a length of fiber required to compensate for dispersion experienced by the input channels of the third multiplexing unit and based on succeeding dispersion compensation fibers associated with the multiplexing units;
a fourth dispersion compensation fiber connected in series with the fourth multiplexing unit, the fourth dispersion compensation fiber having a length based on a length of fiber required to compensate for dispersion experienced by the input channels of the fourth multiplexing unit and based on succeeding dispersion compensation fibers associated with the multiplexing units, and wherein dispersion introduced by the third and fourth dispersion compensation fibers is opposite in sign to dispersion introduced by the first and second dispersion compensation fibers; and
a final multiplexing unit configured to receive a WDM signal output by the first plurality of multiplexing units, configured to receive a WDM signal output by the second plurality of multiplexing units, and configured to output a WDM signal based on the WDM signal output by the first plurality of multiplexing units and based on the WDM signal output by the second plurality of multiplexing units. - View Dependent Claims (34, 35, 36, 37, 38, 39)
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40. A receive side wavelength division demultiplexer, comprising:
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a first demultiplexing unit configured to receive a WDM signal and configured to output a plurality of single optical channels demultiplexed from the WDM signal and configured to output a WDM signal based on the received WDM signal and based on the single optical channels demultiplexed from the WDM signal;
a second demultiplexing unit configured to receive the WDM signal output from the first demultiplexing unit and configured to output a plurality of single optical channels demultiplexed from the WDM signal received from the first demultiplexing unit;
a first dispersion compensation fiber connected in series with the first demultiplexing unit, the first dispersion compensation fiber having a length based on a length of fiber required to compensate for dispersion experienced by the optical channels output by the first multiplexing unit and based on preceding dispersion compensation fibers associated with the demultiplexing units;
a second dispersion compensation fiber connected in series with the second demultiplexing unit, the second dispersion compensation fiber having a length based on a length of fiber required to compensate for dispersion experienced by the optical channels output by the second multiplexing unit and based on preceding dispersion compensation fibers associated with the demultiplexing units;
a third demultiplexing unit configured to receive a WDM signal and configured to output a plurality of single optical channels demultiplexed from the WDM signal and configured to output a WDM signal based on the received WDM signal and based on the single optical channels demultiplexed from the WDM signal;
a fourth demultiplexing unit configured to receive the WDM signal output from the third demultiplexing unit and configured to output a plurality of single optical channels demultiplexed from the WDM signal received from the third demultiplexing unit;
a third dispersion compensation fiber connected in series with the third demultiplexing unit, the third dispersion compensation fiber having a length based on a length of fiber required to compensate for dispersion experienced by the optical channels output by the third multiplexing unit and based on preceding dispersion compensation fibers associated with the demultiplexing units;
a fourth dispersion compensation fiber connected in series with the third demultiplexing unit, the fourth dispersion compensation fiber having a length based on a length of fiber required to compensate for dispersion experienced by the optical channels output by the fourth multiplexing unit and based on preceding dispersion compensation fibers associated with the demultiplexing units, and wherein dispersion introduced by the third and fourth dispersion compensation fibers is opposite in sign to dispersion introduced by the first and second dispersion compensation fibers; and
an optical coupler configured to receive a WDM signal and output first and second WDM signals, wherein the first and second WDM signals output from the optical coupler are input to the first and third demultiplexing units, respectively. - View Dependent Claims (41, 42, 43, 44, 45, 46)
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47. A wavelength division multiplexed optical transmission system, comprising:
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a first plurality of series-connect multiplexing units, each configured to receive a plurality of input channels and output a WDM signal based on the plurality of input channels, and wherein at least one of the first plurality of multiplexing units is configured to receive at least one input channel and a WDM signal from another of the first plurality of multiplexing units and is configured to output a WDM signal based on the at least one input channel and the WDM signal from the other of the first plurality of multiplexing units;
a first plurality of multiplexing dispersion compensation fiber, each connected in series with a corresponding one of the first plurality of multiplexing-units, each of the first plurality of multiplexing dispersion compensation fiber having a length based on dispersion experienced by the input channels received by the corresponding one of the first plurality of multiplexing unit and based on succeeding multiplexing dispersion compensation fibers associated with the first plurality of multiplexing units;
a second plurality of series-connect multiplexing units, each configured to receive a plurality of input channels and output a WDM signal based on the plurality of input channels, and wherein at least one of the second plurality of multiplexing units is configured to receive at least one input channel and a WDM signal from another of the second plurality of multiplexing units and is configured to output a WDM signal based on the at least one input channel and the WDM signal from the other of the second plurality of multiplexing units;
a second plurality of multiplexing dispersion compensation fibers, each connected in series with a corresponding one of the second plurality of multiplexing-units, each of the second plurality of multiplexing dispersion compensation fibers having a length based on dispersion experienced by the input channels received by the corresponding one of the second plurality of multiplexing unit and based on succeeding multiplexing dispersion compensation fibers associated with the second plurality of multiplexing units, and wherein dispersion introduced by the second plurality of multiplexing dispersion compensation fibers is opposite in sign to dispersion introduced by the first plurality of multiplexing dispersion compensation fibers;
a final multiplexing unit configured to receive a WDM signal output by the first plurality of multiplexing units, configured to receive a WDM signal output by the second plurality of multiplexing units, and configured to output a WDM signal based on the WDM signal output by the first plurality of multiplexing units and based on the WDM signal output by the second plurality of multiplexing units;
a first plurality of series-connected demultiplexing units each configured to receive a WDM signal and output at least one single optical channel demultiplexed from the received WDM signal, wherein at least one of the first plurality of demultiplexing units is configured to output at least one single optical channel and a WDM signal based on the received WDM signal;
a first plurality of demultiplexing dispersion compensation fibers, each connected in series with a corresponding one of the first plurality of demultiplexing units, each of the first plurality of demultiplexing dispersion compensation fiber having a length based on dispersion experienced by the WDM signal received by the corresponding demultiplexing unit;
a second plurality of series-connected demultiplexing units each configured to receive a WDM signal and output at least one single optical channel demultiplexed from the received WDM signal, wherein at least one of the second plurality of demultiplexing units is configured to output at least one single optical channel and a WDM signal based on the received WDM signal;
a second plurality of demultiplexing dispersion compensation fibers, each connected in series with a corresponding one of the second plurality of demultiplexing units, each of the second plurality of demultiplexing dispersion compensation fiber having a length based on dispersion experienced by the WDM signal received by the corresponding demultiplexing unit, and wherein dispersion introduced by the second plurality of demultiplexing dispersion compensation fibers is opposite in sign to dispersion introduced by the first plurality of demultiplexing dispersion compensation fibers;
an optical coupler configured to receive a WDM signal and output first and second WDM signals, wherein the first and second WDM signals output from the optical coupler are input to the first and second plurality of demultiplexing units, respectively; and
a fiber connection between the final multiplexing unit and the optical coupler, whereby a WDM signal output by the final multiplexing unit is received by the optical coupler. - View Dependent Claims (48, 49, 50, 51, 52)
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53. A method of compensating a plurality of channels in a wavelength division multiplexed optical transmission system, comprising:
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transmitting the plurality of channels over a fiber connection;
introducing dispersion simultaneously into the plurality of channels following the fiber connection to produce positive dispersion in a first group of channels including at least one channel and negative dispersion in a second group of channels including at least one channel;
demultiplexing the plurality of channels in a cascade sequence;
introducing negative dispersion in the first group of channels after demultiplexing the plurality of channels; and
introducing positive dispersion in the second group of channels after demultiplexing the plurality of channels. - View Dependent Claims (54, 55, 56)
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Specification