How much loss is there in 100 meters of single-mode fiber
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For multimode fiber, the loss is about 3 dB per km for 850 nm sources, 1 dB per km for 1300 nm. After measuring the loss of a fiber link, you now have to determine if that fiber link loss is acceptable or not. You can either compare this loss value to the application requirement or calculate the expected loss based on how many connectors and splices are in the link along with the length of. The acceptable dB loss for single mode fiber can vary depending on several factors, including the specific application, the length of the fiber, the quality of the components used, and the overall design of the network.