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Optics Letters

Optics Letters


  • Vol. 25, Iss. 10 — May. 15, 2000
  • pp: 701–703

Fundamental information-density limits in optically amplified transmission: an entropy analysis

E. Desurvire  »View Author Affiliations

Optics Letters, Vol. 25, Issue 10, pp. 701-703 (2000)

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Fundamental information-density limits are evaluated for amplified systems, based on entropy analysis. It is shown that in-line amplification introduces information loss, which is more important in distributed than in lumped amplification. In the absence of any other degradation (such as that which comes from dispersion and nonlinearity), spectral efficiencies of 6¿14 (bits/s)/Hz represent theoretical limits for medium- and long-haul amplified systems.

© 2000 Optical Society of America

OCIS Codes
(060.4510) Fiber optics and optical communications : Optical communications
(200.3050) Optics in computing : Information processing
(250.4480) Optoelectronics : Optical amplifiers

E. Desurvire, "Fundamental information-density limits in optically amplified transmission: an entropy analysis," Opt. Lett. 25, 701-703 (2000)

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  1. C. E. Shannon, Bell Syst. Tech. J. 27, 379, 623 (1948).
  2. See Proceedings of the European Conference on Optical Communication (Société des Électriciens et des Électroniciens, Paris, 1999).
  3. J. Stark, Ref. 2, paper I-28.
  4. T. E. Stern, IRE Trans. Inf. Theory 435 (1960).
  5. J. P. Gordon, Proc. IRE 1898 (1962).
  6. From an industrial viewpoint, h is referred to as efficiency; however, there is no a priori reason to assume that it should be less than unity [1(bit/s)/Hz]; it is better conceived as representing spectral ID. The true ID efficiency is defined with respect to the unamplified reference system, as discussed in this Letter.
  7. E. Desurvire, Erbium-Doped Fiber Amplifiers: Principles and Applications (Wiley, New York, 1994).

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