What is nema os1

As we known, multimode fiber is usually divided into OM1, OM2, OM3, OM4 and OM5. Then what about single mode fiber? In general, Single mode fiber cable is divided into OS1 and OS2. OS1 and OS2 are cabled single mode optical fiberhe specifications. In fact, there are many differences between OS1 and OS2 single mode fiber. This text will make a comparison between them and then give you a guide on how to choose the right one for your applications.

OS1 single-mode optical fiber meets ITU-T, g.652a or ITU-T g.652b standards. In addition, the low-water-peak fibers defined by ITU-T G.652C and G.652D also come under OS1 single mode fibers. That is to say OS1 is compliant with specifications of ITU-T G.652 However, the OS2 single-mode fiber conforms only to the ITU-T g.652c or ITU-T G.652D standard, which means that the OS2 is explicitly applicable to low water peak fibers. These low-water-peak fibers are commonly used for CWDM (coarse wavelength division multiplexing) applications.


Besides the standards, the main difference between OS1 and OS2 single mode fibers is the cable construction. Typically, OS1 cabling is a tight set structure, which is usually used for indoor applications, such as campuses or data centers. However, OS2 cabling is loose-tube design. Cable with this construction is appropriate for outdoor cases like street, underground and burial. Therefore, the interior of the fiber OS2 outdoor fiber loss per kilometer. Generally speaking, for maximum attenuation for OS1 is 1.0dB / km and OS2 is 0.4dB / km. As a result, the maximum transmission distance of OS1 single mode fiber is 2 km but the maximum transmission distance of OS2 single mode fiber can reach 5 km and is up to 10 km. Then for all these reasons, OS1 is much cheaper thanOS2.

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