Optical Networks - _5_3 Transmitter_58

Optical Networks - _5_3 Transmitter_58 - 292 Transmission...

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292 Transmission System Engineering set its threshold at the average received power and would have a somewhat higher bit error rate. However, the power penalties turn out to be the same in both cases. This penalty is given by PP sig - dep =− 5log ± P ± 1 P 1 ² . (5.4) Finally, it must be kept in mind that polarization plays an important role in many system impairments where signals interfere with each other. The worst case is usually when the interfering signals have the same state of polarization. However, the state of polarization of each signal varies slowly with time in a random manner, and thus we can expect the power penalties to vary with time as well. The system must be designed, however, to accommodate the worst case, usually identical polarizations. System design requires careful budgeting of the power penalties for the different impairments. Here we sketch out one way of doing such a design for a transmission system with optical amplifiers. First we determine the ideal value of the parameter
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This note was uploaded on 01/15/2011 for the course ECE 6543 taught by Professor Boussert during the Spring '09 term at Georgia Institute of Technology.

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Optical Networks - _5_3 Transmitter_58 - 292 Transmission...

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