How does a Non-zero dispersion shifted single mode fiber differ from a conventional single mode fiber?

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Conventional single mode fibers, I mean the one that complies with ITU-T G.652.D is well enough for almost all long distance telecommunication transmission. However, we have Non-zero dispersion shifted single mode fiber available in the market. Non-zero dispersion shifted single-mode fibers are costlier than conventional single mode fibers. If conventional single-mode fibers can be used for long-distance communication, why do we need to use Non-zero dispersion shifted single-mode fibers? How does the non-zero dispersion shifted single mode fiber differs from a conventional single-mode fiber?

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