The purpose of this paper is to numerically study performance improvement of single-channel secure chaotic optical
communications utilizing symmetrical dispersion compensation technique. The decrypted 1.25-Gbits/s non-return-tozero
(NRZ) sequence at the receiver side becomes rather distorting after the transmission of 200-km dispersion shifted
fiber. However, the quality of decrypted sequence is significantly improved by allocating dispersion compensation fiber.
The results show that the Q-factors of the latter dispersion compensation period are smaller than that of the former ones.
This is mainly due to the self-phase modulation (SPM) induced by the nonlinear coefficient of fiber. The results also
indicate that the Q-factors increase in different degrees for three sequences of different bit rates.
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