Performance Comparison of Different Dispersion Compensation Schemes in Quasi-linear Transmission System with Intrachannel Four-wave Mixing

Wen-hua CAO


Intrachannel four-wave mixing (IFWM) is the dominate source of bit errors in high-bit-rate quasi-linear fiber-optic transmission systems. Previous studies have shown that IFWM can be reduced by proper dispersion compensation scheme. In this paper, different schemes like pre-, post-, and symmetrical-dispersion compensations are compared numerically in the presence of IFWM in return-to-zero quasi-linear transmission systems. The performances of the three compensation schemes have been compared in terms of the average intensity deviation of the “1” bits and the relative intensity of the ghost pulse (the “0” bit). It is found that, for a fixed amplifier spacing, optimal compensation scheme (with minimum average intensity deviation of the “1” bits and minimum intensity of the ghost pulse) depends on transmission bit rate. As bit rate increases the performance of pre-compensation becomes better and better. On the contrary, post-compensation exhibits its advantage more and more as bit rate decreases.


Fiber-optic transmission, Dispersion compensation, Intrachannel four-wave mixing


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