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What wdm (wavelength division multiplexing) optical fiber for communication? fiber optics tutorial


Added: 24-04-2007
Author: Colin Yao
Category: Telecommunications
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WDM stands for Wavelength Division Multiplexing. What this does is divide the light into optical fibers Diskret number wavelength (color). Each wavelength (color) is an independent channel running at data rate of 2.5 Gbit / s, 10Gbit / s, 40Gbit /'s or even 100Gbit /'s (still in development). So if the light in the fiber is divided into 16 wavelength (or color channel), and wavelengths each running at 40Gbit / data rate, we get a total of 16 40Gbit/sx = 640Gbit / rate. This is particularly true in the long term and ultra long-distance fiber communication optical links.

Also, 64 degrees and bring more channels (waves) are available on the market today. Which means we can walk in the 2.560 Gbit /'s data rate is more than one fiber. How about 48 degrees in one fiber optic cable? Which gives us a surprise in 2.560 Gbit / sx 48 = 122.880 Gbit /'s links. Of course, the type of high speed and high-fiber count links that are usually only applied to the Internet backbone.

From the example above, you can see the shocking truth about the WDM. Rate increase is to connect fiber optic equipment and fiber optic cables to minimize costs.

What is DWDM?

DWDM stands for Dense Wavelength Division Multiplexing. Here solid for a wavelength channel is very narrow and almost every person. To 100 GHz dense WDM, the interval between adjacent channels is only 100 GHz, (or 0.8 nm). For example, adjacent channels may be 1530.33 nm, 1531.12 nm and 1531.90 nm.

DWDM is used for the band to 1550nm to increase the power EDFA (Erbium Doped fiber amplifier). EDFAs typically used to 1525nm ~ 1565nm (C band) and 1570nm ~ 1610nm (L band).

Why is DWM so important?

Exploitation of DWDM has triggered a powerful explosion of HIV. The amount of information can be sent through a fiber span Tuners that the world has grown so much that now floods the available capacity.

In practice, more can be squeezed out of the system and the development of DWD at or below the limits of space available for transmission wavelength window or a newer, usually at 50GHz, or even 25 GHz. In doing this, retailers can add two or three times the number of channels. Any combination of channels can now be routinely used for the transmission of light pules at 10Gbit / s, or even at the level of the position data over 100 GHz. With the support of WDM, a pair of fiber can provide data for several hundred gigabits per second.

WDM technology does not require upgrading or replacement of fiber infrastructure that has placed the land. Thus, we can improve the links from one level to another or simply reconfigure the terminal equipment and develop a repeater.

WDM technology to provide the raw transmission capacity. This should be structured in a way that can bring good traffic and taken to where the demand. This is a network layer protocol that next play. SDH and SONET (They are the same. SONET is used in the United States while SDH is used in the world). We will touch on SDH and SONET in a few other tutorials.




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