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What is the difference between a single mode connector (ST, SC etc) and a multimode connector?

In general, there are two main differences between singlemode and multimode connectors. The first and most obvious would be the color of the strain relief boot. A singlemode boot is generally blue or white, while multimode boots are normally black or beige. But, the main difference is in the ferrule of the connector. Singlemode connectors will almost always have a zironia (ceramic) ferrule while multimode connectors can have stainless steel (Nickel-Silver), composite (plasitc), or zirconia. The size of the hole in the center of the ferrule will determine the correct fiber type that the connector is designed for. A standard

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Should I choose 125.5um or 126um hole ferrule for 125um fibers? What is the difference?

126um is the recommended ferrule hole size for 125um singlemode fiber. There are some 125.5um ferrules available for critical alignement situations, but for general connectorization, the 126um hole allows for some epoxy bond around the fiber, and for ease of fiber insertion without breakage. You can choose from a range of connector products on the Connector and Mating Sleeves page.

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