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Discover the building blocks for next generation
data centers. Keeping data centers up to date is a constant challenge. It requires agile adaption to data growth,
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HUBER+SUHNER Inc. Charlotte NC 28273 (USA),
specific window, WBMMF will support transmission in four
separate operating windows.
The essential value proposition of WBMMF is that rather
than needing four separate fibers to transmit four distinct optical signals, the signals can be sent down a single fiber over four
separate operating windows. OM3 and OM4 fiber have been optimized to transmit signals in the 850-nm operating window
exclusively, and those fibers’ bandwidth performance at other
operating windows is less than its bandwidth performance at
850 nm. As a practical matter, OM3 and OM4 fibers can support
high-speed transmission at 850 nm only. WBMMF will support
high-speed transmission at four wavelengths. One application
of WBMMF could be for each optimized wavelength to provide
a 10-Gbit/sec “traffic lane,” enabling a duplex WBMMF connection to accommodate 40-Gbit/sec transmission. Another application could be for each lane to support 25 Gbits/sec, enabling
a duplex WBMMF connection to accommodate 100-Gbit/sec
transmission. Scaling that 25-Gbit/sec/lane model would allow
400-Gbit/sec transmission over 8 wideband multimode fibers.
Accomplishing objectives like these requires development
of transceivers to perform WDM. While standards efforts are
ongoing and the exact wavelengths have not been finalized,
standards makers’ efforts have been to specify a WBMMF that
is optimized at four wavelengths roughly between 850 and 950
nm. In general, the wider the spacing between the optimized
wavelengths, the more readily transceiver manufacturers can
produce WDM equipment economically.
WBMMF’s optimization at 850 nm will make it back-ward-compatible with OM4. WBMMF is in production and
available for purchase today. Its promise of OM4 backward compatibility means users can specify WBMMF and use it for OM4-
based applications today, and in doing so provide themselves
with the capability to support WDM applications in the future.
At the BICSI Winter Conference held in early February,
OFS multimode optical fiber product manager John Kamino
delivered a presentation titled “Next Generation Multimode
Fiber.” In that presentation he described the drivers behind
the need for more-capable multimode fiber, the current standards scene within the TIA as well as the IEEE (Ethernet) and
INCITS (Fibre Channel), and other detail on the latest developments in multimode fiber production and use.
The color-coded illustration in this article showing
Ethernet link distances and the most appropriate fiber types
for them comes from Kamino’s presentation. That presentation can be accessed and downloaded at bicsi.org.
We will continue to track the standards and technological
developments of multimode optical fiber, and will report our
findings periodically. u