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Recently, a topic about SMF and MMF is hot in the forum. And lots of people have expressed their own views, which can be checked in this link: single-mode fiber vs multimode implementation recommendations and cost difference. From the reddit post, we can summarize that the optics for single-mode are more expensive than optics for multimode. But the single-mode fiber itself is usually significantly cheaper. And lots of data centers and providers will only do single-mode cabling for new installs.