When people talk about connectivity,
they usually refer to bandwidth and
the trend of network traffic. Bandwidth is certainly an important aspect of
connectivity; however, bandwidth is not
the whole story. It’s crucial to understand that efficiency is another important
aspect of connectivity.
I have the honor of speaking at this year’s Ethernet Technology Summit in San
Jose, Calif. The event is April 14-16
and my presentation will take place April
15 at 8 a.m. My topic, “Build a
Solid Cabling Foundation for High-Speed Ethernet,” will cover what I believe
are the most important aspects to achieving
better efficiency in connectivity.
What do I mean by “efficiency
in connectivity?” Let me use fiber
cabling as an example. It is understood that 10 Gigabit Ethernet can operate over duplex multimode fiber. This means that laser light is transmitted over one fiberand received over the other fiber. The
color (wavelength or frequency in technical terms) of the two lasers is the same. The fibers are 100 percent utilized; however, the percentage is not the limit. The efficiency of fiber utilization can be
improved from there. Would you like to know how?
Recently, Finisar and
demonstrated short wavelength division multiplexing (SWDM) over wide band multimode fiber (WBMMF) at the 2015
Optical Fiber Communications and Conference Exposition. In this
technology demonstration, four lasers of
different colors were combined
through an optical multiplexor, transmitted
over one fiber and simultaneously received and de-multiplexed to four photon detectors. The efficiency
of fiber utilization is increased fourfold.The
figure below shows the light of four different wavelengths being
carried over one multimode fiber strand.
The image of the demonstration
setup below includes four pairs of optical
transceivers and a multiplexor/de-multiplexor
from Finisar and WBMMF cable from CommScope.
The signal carried in each light (represented by a color)
operates at the data rate of 25 Gigabit
per second (Gbps) in the demo. The aggregated data rate of four lights becomes 100 Gbps.
So, 10 Gbps operates
over two multimode fibers and the 100 Gbps operation in the demonstration also
ran over two multimode fibers. From
10 Gbps to 100 Gbps, the data rate is increased
10-fold. This is the power of achieving
efficiency in fiber connectivity. I believe this is the future of how high-speed
Ethernet will operate over multimode fiber.
There is more than one way to increase efficiency in connectivity. If you want to know more, feel
free to stop by my presentation at the Ethernet Technology Summit or leave a
comment below and I will be sure to respond.