Using existing fiber in my facility and cannot get my multimode 850 or 1300 nm transmission system to work. Whats wrong?
Be certain that the fiber optic cable is indeed multimode fiber. You will have to look at the fiber cable jacket to determine this or contact the installer if it is not clear. Single-mode fiber can look the same as multimode and even the connectors can look the same (especially if they are STs) but the operation is completely different. The light carrying core of single-mode fiber is only 8 to 10 microns in diameter while multimode fiber has a core diameter of 62.5 microns. This means that a multimode transmitter cannot possibly “launch” enough light power into a single-mode fiber. If the fiber turns out to be single-mode, you have no choice but to switch the transmitter and receiver.
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