What’s the Deal with OM5?
April 19, 2017
OM5, previously known as wide band multimode fiber or WB MMF, has been quite the hot-button topic as the standards have been widely debated and now finally concrete.
So what is OM5 exactly? Most simply, it’s a version of the OM4 fiber with additional bandwidth characterization at 953 nm. To provide the full picture, here are answers to some of the most FAQs throughout the industry.
Telecommunications Industry Association (TIA) initiated a work group in October 2014 to develop guidance for a wide band multimode fiber (WB MMF) 50/125 μm fiber standard to support short wavelength division multiplexing (SWDM) transmission. The TIA-492AAAE Standard was published in June 2016. The IEC WB MMF standard is anticipated to be completed by early 2017.
The OM5 optical and mechanical attributes are compliant with OM4 50/125 μm specifications and include the additional specifications of effective modal bandwidth and attenuation at 953 nm. WB MMF is intended for operation using vertical-cavity surface-emitting laser (VCSEL) transceivers across the 846 to 953 nm wavelength range.
SWDM is a proprietary wavelength division multiplexing (WDM) technology that uses four wavelengths across the 850 to 940 nm range. SWDM transceivers were designed to use 2-fiber connectivity into the transceiver with OM3/OM4. SWDM VCSEL transceivers are expected to be commercialized throughout 2017.
Yes. SWDM transceivers are compatible with OM3/OM4/OM5 optical connectivity solutions.
The 40/100GbE expected operation distances are given in this table.
EMB ≥ 4700 MHz・km at 850 nm
EMB ≥ 2470 MHz・km at 953 nm
EMB is specified only at 850 nm for OM3/OM4 at 2000/4700 MHz・km, respectively. OM5 EMB values are specified at both 850 and 953 nm.
The best system performance is achieved by a combination of low chromatic dispersion and high EMB. For typical optical fiber, the ideal zero dispersion wavelength occurs at 1310 nm. Because 953 nm is closer to 1310 nm than 850 nm, the chromatic dispersion is lower and consequently the EMB requirement is lower to achieve the same system performance.
There are no transmission standards that specify OM5 or SWDM. Transmission standards typically include only one multimode fiber variant that is selected based on economic, commercial, and technical criteria. Parallel transmission is the default multimode fiber variant for data rates ≥ 40G.
TIA has not specified a cable jacket color to date. Corning will use an aqua jacket color with OM5 identification print markings on the jacket unless TIA specifies another color.
No. Traditional Corning universal polarity connectivity solutions can be used. End users are expected to deploy solutions with Base-8 or Base-12 MTPR backbone cables and MTP-to-LC modules or harnesses to breakout into 2-fiber LC interconnects.
No. Compliant 850 nm field channel loss measurements can be used to demonstrate 953 nm channel loss conformance.
Yes. Corning Optical Communications’ EDGE and EDGE8 solutions with OM4 and OM5 have the same 40G BiDi 200 m distance capability.
Read more about SWDM here.