Dispersion compensation for hybrid use of G.652 and G.655 fibers.

The G.652 and G.655 fibers have different dispersion coefficients. The dispersion coefficient of the G.652 fiber is 17 ps/nm.km, and the dispersion coefficient of the G.655 fiber is 4.517 ps/nm.km.
When the G.652 and G.655 fibers are used together, the dispersion should be calculated respectively. The G.652-specific DCMs can be used to compensate for the dispersion of both G.652 and G.655 fibers. You can divide the length of the G.655 fiber by 4, and then determine the DCM type based on the calculation result.

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