CWDM and DWDM

WDM

In the same optical fiber, the technique allowing two or more optical wave to transmit information through different optical tunnels is called WDM.

CWDM and DWDM

CWDM and DWDM both belong to WDM, being able to inset different wavelength into single core to transmit together. CWDM is a low-expenditure technique designed to MAN.

The standard wavelength interval of CWDM is 20nm and common wavelengths are 1470nm, 1490nm, 1510nm, 1530nm, 1550nm, 1590nm and 1610nm. The wavelength interval of DWDM is below 0.8nm.

The advantages of CWDM

1．  Low cost and high efficiency

In MAN, owing to its short distance, no need to use Amplifier, and insensitivity to the transmission of optical fibers, adopting CWDM can reduce the requirements on devices and components, thus cutting the expenditure.

2．  Low power consumption

The DWDM system each laser to consume approximately 4W power, while CWDM with no cooler laser consuming only 0.5W.

3．  Small volume

The size of DWDM is roughly 5 times of the volume of CWDM

4． Low requirements on system

When operating the business over 10G, DWDM needs to adopt G.655 optical fiber while CWDM has no specific requirements for this. It can use G.652, G.653, and G.655, thus being able to use more the form optical fibers. CWDM requires no use of those expensive DWDM (Dense wavelength division multiplier) and EDFA, only demanding the cheaper laser as a platform, thus producing a low cost.

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Tags: CWDM and DWDM transceivers,CWDM system, DWDM system