Abstract

The influence of fiber nonlinearity on the fiber transfer function is investigated theoretically and experimentally. A rigorous expression for the fiber transfer function using a directly modulated semiconductor laser as optical transmitter is presented. Very good agreement of fiber transfer function between experimental data and theoretical predictions is achieved. Furthermore, the fiber parameter values extracted from fitting are the same as those obtained from relative intensity noise measurements, and the fiber nonlinearity coefficient value is compared with other published results. A thorough physical explanation for the effect of fiber nonlinearity on the fiber transfer function at low-medium frequencies is provided. Results reveal that in the anomalous dispersion regime the fiber nonlinearity enhances the high-pass behavior typical of the fiber transfer function using a directly modulated laser operating at high bias current, shifts the transfer function dips toward higher frequency, and consequently leads to a larger bandwidth. Furthermore, it is shown that the fiber nonlinearity can provide partial or total compensation of the nonuniform frequency response at low-medium frequencies resulting from a directly modulated laser operated at low bias current.

[IEEE ]

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J. Lightwave Technol. (8)

F. Devaux, Y. Sorel, and J. Kerdiles, "Simple measurement of fiber dispersion and of chirp parameter of intensity modulated light emitter," J. Lightwave Technol., vol. 11, pp. 1937-1940, Dec. 1993.

L. Bjerkan, A. R yset, L. Hafskj r, and D. Myhre, "Measurement of laser parameters for simulation of high-speed fiberoptic systems," J. Lightwave Technol., vol. 14, pp. 839-850, May 1996.

B. Wedding, B. Franz, and B. Junginger, "10 Gb/s optical transmission up to 253km via standard single-mode fiber using the method of dispersion-supported transmission," J. Lightwave Technol., vol. 12, pp. 1720-1727, Oct. 1994.

J. Wang and K. Petermann, "Small signal analysis for dispersive optical fiber communication systems," J. Lightwave Technol., vol. 10, pp. 96-100, Jan. 1992.

N. Kikuchi and S. Sasaki, "Analytical evaluation technique of self-phase-modulation effect on the performance of cascaded optical-amplifier systems," J. Lightwave Technol., vol. 13, pp. 868-878, May 1995.

N. Suzuki and T. Ozeki, "Simultaneous compensation of laser chirp, Kerr effect, and dispersion in 10-Gb/s long-haul transmission systems," J. Lightwave Technol., vol. 11, pp. 1486-1494, Sept. 1995.

A. Cartaxo, B. Wedding, and W. Idler, "Influence of fiber nonlinearity on the phase noise to intensity noise conversion in fiber transmission: theoretical and experimental analysis," J. Lightwave Technol., vol. 16, pp. 1187-1194, July 1998.

J. K. Andersen, J. W. Lou, G. A. Nowak, T. Xia, M. N. Islam, R. M. Fortenberry, and S. A. Newton, "Path average measurements of optical fiber nonlinearity using solitons," J. Lightwave Technol., vol. 16, pp. 2328-2335, Dec. 1998.

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