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Connected and efficient buildings and data centers increasingly rely on a state-of-the-art physical layer infrastructure to support growing bandwidth needs over copper, fiber and wireless technologies. When it comes to optical fiber transmission, singlemode fiber often gets the headlines with high-speed transmission records over long distances; however, multimode fiber is the workhorse media of local area network (LAN) backbones and storage area networks (SAN) in buildings and data centers.
The reason is because multimode fiber offers the lowest cost means of transporting high data rates for the distances aligned with the needs of these environments. We can expect multimode fiber’s dominance in buildings and data centers to continue because of recent developments in multimode technology and international standardization that will extend the value proposition offered by multimode fiber for today’s and tomorrow’s networks.
Since its original inclusion in the international cabling standard ISO/IEC 11801, multimode fiber has evolved from supporting multi-megabit per second transmission using light emitting diode (LED) light sources to being optimized for multi-gigabit transmission using 850 nanometer (nm) vertical cavity surface emitting lasers (VCSELs). With the introduction of laser optimized multimode fiber in the late 1990s, a significant update to the ISO/IEC 11801 standard included the addition of cabled optical multimode (OM) fiber categories—OM1, OM2 and OM3.
OM1 and OM2 were defined for legacy LED optimized fibers. OM3 was defined for multimode fiber optimized for laser transmission at 850 nm. A few years later, an OM4 category was added, to recognize multimode fiber with more than double the effective bandwidth at 850 nm, supporting extended distances for gigabit and multi-gigabit applications.
Another significant update to the multimode fiber categories is currently under way with the development of the third edition of ISO/IEC 11801 (expected for publication next year). Due to the success and prevalence of 850 nm VCSELs in today’s networks, the third edition will “grandfather in” the LED optimized OM1 and OM2 fiber categories. They may only be used for changes and additions to existing installations. As a result, OM3 will be the minimum requirement for new installations.
Today, OM3 and OM4 fibers are increasingly being used in parallel fiber infrastructures using MPO connectors. They support speeds up to 100 gigabit per second (Gb/s) using multiple parallel VCSELs with standards in development to support up to 400 Gb/s using parallel technology.
The most significant optical fiber development in the third edition of ISO/IEC 11801 is the recent addition of a wideband multimode fiber (WBMMF) category allowing simultaneous transmission of at least four different wavelengths over each fiber, expanding per-fiber capacity with support for shortwave wavelength division multiplexing (SWDM). The new WBMMF category will be included in the standard’s final draft to be circulated shortly. The naming of the new WBMMF category will be selected by national votes. The choices proposed are OM4W, OM5 and OM5W.
Regardless of the name selected, one thing is clear: WBMMF is set to widen the applications horizon for multimode fiber in connected and efficient buildings and data centers worldwide.
Have you considered WBMMF to help make your building or data center become connected and efficient?