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

1. G.652 and G.655 fibers have different dispersion coefficients. To be specific, the dispersion coefficient for G.652 fibers is 17 ps.nm/km and that for G.655 fibers is 4.517 ps.nm/km.
2. When both G.652 and G.655 fibers are used, dispersion of G.652 and G.655 fibers needs to be calculated separately. You can determine the DCM type of a G.652 fiber depending on the G.652 fiber length. The G.652 fiber length can be calculated using the following formula: G.652 fiber length = G.655 fiber length/4.

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