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Difference between OS1 and OS2 Single Mode Fibre Cable

Aug 11th 2015 at 2:35 AM

As we all know, multimode fiber is usually divided into OM1, OM2, OM3 and OM4. Then how about single mode fiber? In general, single mode fiber is categorised into OS1 and OS2. OS1 and OS2 are cabled single mode optical fibre 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 fibers are compliant with ITU-T G.652A or ITU-T G.652B standards. Besides, 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, OS2 single mode fibers are only compliant with ITU-T G.652C or ITU-T G.652D standards, which means OS2 is explicitly applied to the low-water-peak fibers. These low-water-peak fibers are usually used for CWDM (Coarse Wavelength Division Multiplexing) applications.

OS1 and OS2 Single Mode Fibre Besides the standards, the main difference between OS1 and OS2 single mode fibers is the cable construction. Typically, OS1 cabling is tight-buffered construction, which is usually used for indoor applications, such as campus or data centre. Yet OS2 cabling is loose-tube design. Cable with this construction is appropriate for outdoor cases like street, underground and burial. For this reason, OS1 indoor fibre has greater loss per kilometre than OS2 outdoor fibre. In general, the maximum attenuation for OS1 is 1.0 db/km and for 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 than OS2. There is point need to pay attention to is that both OS1 and OS2 single mode fibers over their distance will allow speeds of 1 to 10 gigabit Ethernet. All of these differences between OS1 and OS2 discussed above are listed in the table below. You can get a clear understanding from it.

Name OS1 OS2 Standards ITU-T G.652A/B/C/D ITU-T G.652C/D Construction Tight buffered Loose tube Application Indoor Outdoor Attenuation 1.0db/km 0.4db/km Distance 2 km 10 km Price Low High

Learning about the differences between OS1 and OS2 single mode fibre cable, then which cable should you choose? First, if you want to use for indoor application, OS1 is better for you. However, if used for outdoor application, you should choose OS2. Second, there is no benefit to be gained in using OS2 cable if under 2 km. OS2 is best for distance over 2 km. Finally, you should note that OS1 is much cheaper than OS2. In order to save cost, if the OS1 is enough for your application there is no need to use OS2. Fiberstore offers OS1 and OS2 single mode fiber patch cable as well as all kinds of multimode fiber patch cable. It is your optimal selection.

Original article source: http://www.cables-solutions.com/

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