Abstract

This paper proposes pulse width management in order to extend the repeater spacings of repeaterless transmission systems with optical amplifiers. First, the dependency of receiver sensitivity on duty ratio, receiver response, and fiber dispersion is clarified by numerical analysis. Next, the calculation results of sensitivity as a function of signal format and receiver basedband response are verified experimentally. Moreover, we show that pulse width management which uses return-to-zero (RZ) format with large duty ratio (\sim0.7) at the transmitter and pulse compression at the receiver increases the repeater gain by \sim4.5 dB compared to conventional systems employing nonreturn-to-zero (NRZ) format. Record repeater spacing of 300 km is realized at 10 Gb/s by utilizing pulse width management.

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  1. N. A. Olsson, "Lightwave systems with optical amplifiers," J. Lightwave Technol., vol. 7, pp. 1071-1082, 1989.
  2. D. Marcuse, "Calculation of bit-error probability for a lightwave system with optical amplifiers and post-detection Gaussian noise," J. Lightwave Technol., vol. 9, pp. 505-523, 1991.
  3. L. F. B. Ribeiro, J. R. F. Da Rocha, and J. L. Pinto, "Performance evaluation of EDFA preamplified receivers taking into account intersymbol interference," J. Lightwave Technol., vol. 13, pp. 225-232, 1995.
  4. S. L. Danielsen, B. Mikkelsen, T. Durhuus, C. Joergensen, and K. E. Stubkjaer, "Detailed noise statistics for an optically preamplified direct detection receiver," J. Lightwave Technol., vol. 13, pp. 977-980, 1995.
  5. A. F. Elrefaie, R. E. Wagner, D. A. Atlas, and D. G. Daut, "Chromatic dispersion limitations in coherent lightwave transmission systems," J. Lightwave Technol., vol. 6, pp. 704-709, 1988.

J. Lightwave Technol. (5)

N. A. Olsson, "Lightwave systems with optical amplifiers," J. Lightwave Technol., vol. 7, pp. 1071-1082, 1989.

D. Marcuse, "Calculation of bit-error probability for a lightwave system with optical amplifiers and post-detection Gaussian noise," J. Lightwave Technol., vol. 9, pp. 505-523, 1991.

L. F. B. Ribeiro, J. R. F. Da Rocha, and J. L. Pinto, "Performance evaluation of EDFA preamplified receivers taking into account intersymbol interference," J. Lightwave Technol., vol. 13, pp. 225-232, 1995.

S. L. Danielsen, B. Mikkelsen, T. Durhuus, C. Joergensen, and K. E. Stubkjaer, "Detailed noise statistics for an optically preamplified direct detection receiver," J. Lightwave Technol., vol. 13, pp. 977-980, 1995.

A. F. Elrefaie, R. E. Wagner, D. A. Atlas, and D. G. Daut, "Chromatic dispersion limitations in coherent lightwave transmission systems," J. Lightwave Technol., vol. 6, pp. 704-709, 1988.

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