Signal power allocation apparatus and method
First Claim
1. An apparatus for multiplexing with variable grades of service to independent channels, the apparatus comprising:
- first and second lasers;
first and second digital data signals;
first and second photonic modulators configured to modulate the first and second lasers with the first and second digital data signals, providing first and second modulated photonic signals;
first and second delay mechanisms configured to provide delayed copies of the first and second modulated photonic signals, delayed by first and second delays, respectively;
combiners configured to combine the delayed copies with the first and second modulated signals to form first and second consolidated modulated signals, respectively; and
a control module configured to adjust the power of the first and second consolidated signals by first and second weights, respectively, corresponding to the quality of service required by first and second users.
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Abstract
Providing variable grades of service to a plurality of users in a delay domain or coherence multiplexing environment, a method combines non-synchronized, mixed rate channels over a single coherence multiplexed datalink. The power levels of each independent channel may be varied to optimize the performance of the multiplexed system and provide differing grades of service required by independent users and reduce cross-channel interference. Channels of lower data rates may be transmitted at a lower power level to further optimize the total power transmitted across an optical fiber, where the total power into the fiber is held constant. The present invention employs a control module configured to adjust the power levels of the independent channels based on the signal to noise ratio or bit error ratio, data rates required by independent users, the input power level allowed by a fiber, fiber cable loss, detector noise, and laser coherence length.
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Citations
20 Claims
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1. An apparatus for multiplexing with variable grades of service to independent channels, the apparatus comprising:
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first and second lasers;
first and second digital data signals;
first and second photonic modulators configured to modulate the first and second lasers with the first and second digital data signals, providing first and second modulated photonic signals;
first and second delay mechanisms configured to provide delayed copies of the first and second modulated photonic signals, delayed by first and second delays, respectively;
combiners configured to combine the delayed copies with the first and second modulated signals to form first and second consolidated modulated signals, respectively; and
a control module configured to adjust the power of the first and second consolidated signals by first and second weights, respectively, corresponding to the quality of service required by first and second users. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20)
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13. A method for coherence multiplexing providing variable grades-of-service to independent channels, the method comprising:
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providing first and second lasers;
providing first and second digital data signals;
modulating the first and second lasers with the first and second digital data signals to provide first and second modulated photonic signals;
providing delayed copies of the first and second modulated photonic signals, delayed by first and second delays, respectively, the delayed copies being recombined with the first and second modulated signals to form first and second consolidated modulated signals; and
adjusting the power of the first and second consolidated signals by first and second weights, respectively, corresponding to the quality of service required by first and second users, respectively.
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Specification