Transmission power optimization apparatus and method
First Claim
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1. A method of designing an optical communication path for carrying a plurality of channels, where each channel is used for forwarding a signal, includes the steps of:
- transmitting signals on each of the channels from a transmit point to an end point using a Directly Modulated Laser (DML) having a selectable power range comprising a plurality of coarse incremental steps associated with a plurality of output power levels, the transmitted signals having an aggregate power level; and
decreasing deviation of output signal characteristics between a first channel transmitted at a first initial power level and a second channel transmitted at a second initial power level by coarsely modifying the first and second initial transmit power levels by equal but opposite coarse while maintaining the aggregate power level of the transmitted signals.
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Abstract
A method and system is provided that is capable of controlling transmit power to achieve a desired OSNR at a receive endpoint. The system utilizes the fact that the aggregate power for a plurality of channels is controllable between a transmission point and a receive point in the network, and uses this characteristic to coarsely adjust transmission powers in the network to achieve desired OSNR results.
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Citations
30 Claims
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1. A method of designing an optical communication path for carrying a plurality of channels, where each channel is used for forwarding a signal, includes the steps of:
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transmitting signals on each of the channels from a transmit point to an end point using a Directly Modulated Laser (DML) having a selectable power range comprising a plurality of coarse incremental steps associated with a plurality of output power levels, the transmitted signals having an aggregate power level; and decreasing deviation of output signal characteristics between a first channel transmitted at a first initial power level and a second channel transmitted at a second initial power level by coarsely modifying the first and second initial transmit power levels by equal but opposite coarse while maintaining the aggregate power level of the transmitted signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An optical network comprising:
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a transmitter comprising a plurality of Directly Modulated Lasers (DML which provide transmitted signals having transmit powers selectable by coarse increments, the transmitter for generating a corresponding plurality of signals, each of the signals operating at a different channel frequency, wherein each laser provides a signal having a wavelength and a transmit power in response to a selected increment of the DML to an end point; a controller, coupled to each of the lasers, the controller for modifying the transmission power used by first and second DMLs by equal but opposite coarse increments to decrease deviation of an output signal characteristic between a first channel transmitted by the first DML and a second channel transmitted the second DML in response to feedback, wherein aggregate power at the end point is unchanged by modifying the transmission power of the first and second DMLs by equal but opposite coarse increments. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. An apparatus for designing an optical network wherein a plurality of signals are transmitted over a corresponding plurality of channels including:
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means for determining, at an endpoint in the optical network, a change in a characteristic of each of the plurality of signals, means for determining an aggregate power of the plurality of signals, and means for coarsely modifying the transmission power of at least two of the plurality of signals by equal but opposite coarse increments to reduce deviation in the characteristic between ones of the plurality of signals at the endpoint without changing the aggregate power of the plurality of signals. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification