Difference Between DWDM vs.CWDM

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Difference Between DWDM vs. CWDM
CREATED BY CBOGmbH
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What is DWDM
DWDM is a shortening Dense Wavelength Division
Multiplexing. DWDM as an optical transmission
technology has evolved after the previous
SONET/SDH technology has reached its limitations
in terms of ecosystem components to achieve price
competitive high data rates transmissions over
the fibers.
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The Development of WDM
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WDM technology has changed the way that data
streams are launched on the fiber.
The development of optoelectronic components has
allowed to transmit simultaneous parallel light
waveguides on the fiber expanding the total
bandwidth of a transmission system.
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DWDM - system components require higher precision
in fabrication and operation thus making the
overall price of the system higher than the CWDM
- Coarse Wavelength Division Multiplexing which
appeared later as an cheaper alternative for
shorter distances and few lambdas to be
transmitted.
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CWDM / DWDM - The Differences
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CWDM
DWDM
DWDM uses frequencies standardizations, the ITU-T
G.694.1 frequency grid to address each channel
transmitted over fiber, these frequencies are
much more dense and more tightly spaced than
CWDM.
CWDM uses lambdas to refer to its transmission
guides and the ITU standardized a channel spacing
grid for use with CWDM (ITU-T G.694.2). 
Analyzing and comparing the signals on the fiber
it may be observed the wider band signals of CWDM
and larger spaces between lambdas having a
greater tolerance to frequency shifting.
In DWDM systems, narrow frequencies and tightly
packed transmission on the line requires
precision filters, cooled lasers and dispersion
compensators.
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DWDM
DWDM system can reach distances of thousands of
kilometers with the combination of Erbium Doped
Fibre Amplifier or Raman Amplifiers on single
mode fibers.
CWDM
CWDM distances are up to tens of kilometers
without the use of optical amplifiers that may be
adequate for metro carriers who prefer to start
small and expand later as demand increases.
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Summary
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CONTACT Us
CBO GmbHFriedhofstr. 2545478 Muelheim an der
Ruhr / Germany
email info_at_cbo-it.de
Hotline0049 - 208 - 777 247 - 0
https//www.cbo-it.de/de/produkte/blueoptics/trans
ceiver/sfpplus.html
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