Abstract

A simple model to evaluate the penalty due to amplifier gainshape in a wavelength division multiplexing (WDM) optical system is proposed. The model requires only knowledge of the overall gain of the amplifier chain for all channels and provides signal-to-noise ratio (SNR) penalties for given launched powers. It also provides the input power distribution required for SNR equalization, and the associated SNR penalty, by solving an eigenvalue/eigenvector problem. The penalty predicted by the model agrees well with recent field measurements on a transoceanic cable. The model can also be applied to predict the gainshape of the amplifier chain from a measurement of the output noise spectrum with no input signal. The capacity of a long amplifier chain can thereby be determined from the receiving terminal only.

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References

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  2. R. E. Wagner, R. C. Alferness, A. A. M. Saleh, and M. S. Goodman, "MONET: Multiwavelength optical networking," J. Lightwave Technol., vol. 14, pp. 1349-1355, June 1996.
  3. N. S. Bergano and C. R. Davidson, "Circulating loop transmission experiments for the study of long-haul transmission systems using erbium-doped fiber amplifiers," J. Lightwave Technol., vol. 13, pp. 879-888, May 1995.

J. Lightwave Technol.

D. Marcuse, "Derivation of analytical expression for the bit-error probability in lightwave systems with optical amplifiers," J. Lightwave Technol., vol. 8, pp. 1816-1823, Dec. 1990.

R. E. Wagner, R. C. Alferness, A. A. M. Saleh, and M. S. Goodman, "MONET: Multiwavelength optical networking," J. Lightwave Technol., vol. 14, pp. 1349-1355, June 1996.

N. S. Bergano and C. R. Davidson, "Circulating loop transmission experiments for the study of long-haul transmission systems using erbium-doped fiber amplifiers," J. Lightwave Technol., vol. 13, pp. 879-888, May 1995.

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