Difference between CWDM and DWDM


Optical multiplexing developments like Coarse Wavelength Division Multiplexing (CWDM) and Thick Wavelength Division Multiplexing (DWDM) are utilized to extend the capacity of fiber-optic networks. CWDM livelihoods a little number of wavelengths scattered 20nm separated to transmit signals over a single fiber, whereas DWDM businesses a more noteworthy number of wavelengths scattered since it was 0.8nm confined for higher bandwidth. While both improvements combine particular signals onto a single fiber, there are one or two noteworthy contrasts between them. In this article, we'll investigate the contrasts between CWDM and DWDM.

CWDM (Coarse Wavelength Division Multiplexing)

CWDM technology uses a small number of wavelengths, as a rule between 8 and 16, that are divided into 20 nanometers (nm) separated to transmit different signals over a single fiber. The wavelengths utilized in CWDM are regularly within the run of 1270 nm to 1610 nm. Each wavelength can carry an isolated flag, empowering numerous channels to be transmitted over a single fiber. CWDM is utilized for short-distance transmissions, up to 80 km, and is commonly utilized in Metropolitan Region Systems (MANs).

Features of CWDM

  • It is an optical multiplexing innovation utilized to extend the capacity of fiber-optic systems.

  • CWDM employments a little number of wavelengths, ordinarily between 8 and 16, divided 20 nanometers (nm) separated.

  • The wavelengths used in CWDM are within the run of 1270 nm to 1610 nm.

  • Each wavelength can carry a partitioned flag, empowering different channels to be transmitted over a single fiber.

  • CWDM is ordinarily utilized for short-distance transmissions, up to 80 km, and is commonly used in Metropolitan Zone Systems (MANs).

Advantages of CWDM

  • Cost-effective arrangement for systems that require direct transmission capacity.

  • Basic hardware prerequisites, which makes it less costly to convey and keep up.

  • Adaptable innovation that can be updated to back extra channels when required.

  • Low control utilization compared to other optical innovations.

  • It can be utilized in conjunction with other organized innovations such as Ethernet, SONET, and SDH.

Drawbacks of CWDM

  • CWDM employments a restricted number of wavelengths, which can lead to channel cover and diminished capacity, especially in systems with tall activity requests.

  • CWDM is ordinarily utilized for short-distance transmissions, up to 80 km, which makes it less reasonable for long-haul systems.

  • CWDM is more vulnerable to flag impedances and crosstalk compared to DWDM. This could result in debased flag quality and diminished transmission speeds.

  • CWDM can be less dependable in unfavorable climate conditions such as overwhelming rain, haze, or snow, which can influence flag transmission.

DWDM (Dense Wavelength Division Multiplexing)

DWDM uses a more broad range of wavelengths, as a rule between 40 and 80, spaced as if 0.8 nm separated to transmit different signals over a single fiber. The wavelengths utilized in DWDM are regularly within the run of 1530 nm to 1620 nm. Each wavelength can carry a partitioned flag, empowering much higher transmission capacity over a single fiber. DWDM is primarily utilized for long-distance transmissions, up to 200 km or more, and is commonly utilized in long-haul systems and submarine cables.

Features of DWDM

  • DWDM uses a large number of wavelengths, ordinarily up to 80, dispersed as it were 0.8 nanometers (nm) separated.

  • The wavelengths utilized in DWDM are within the extent of 1530 nm to 1565 nm, with the potential for development to other wavelengths.

  • Each wavelength can carry a partitioned flag, empowering different channels to be transmitted over a single fiber.

  • DWDM is typically used for long-distance transmissions, up to thousands of kilometers, and is commonly utilized in backbone networks.

DWDM Advantages Include

  • DWDM has a huge number of wavelengths, empowering high-bandwidth transmission and supporting speeds of up to 400 Gbps per channel.

  • It is outlined for long-haul transmission, empowering signals to be sent over thousands of kilometers without signal debasement.

  • DWDM may be a profoundly versatile innovation that can back numerous channels, empowering arrange capacity to be expanded as required.

Difference between CWDM and DWDM

The differences are in the following table −

Basis of Difference

CWDM

DWDM

Wavelength Range

CWDM employments a wavelength extend of 1270 nm to 1610 nm.

DWDM employments a wavelength run of 1530 nm to 1565 nm, with the potential for development to other wavelengths.

Capacity

CWDM can back up to 18 channels.

DWDM can bolster up to 80 channels.

Channel Spacing

The channel dispersing for CWDM is 20 nm.

The channel dispersing for DWDM is 0.8 nm.

Scope

CWDM is ordinarily utilized for brief to medium-haul systems, with a scope removal of up to 80 km.

DWDM is outlined for long-haul transmission, with a scope separate of up to thousands of kilometers.

Complexity

The lenghty complex structures would be created in a program in CWDM.

It is utilized to actualize fundamental structures in a program

Usable

It can be utilized to form measured, reusable code.

It is regularly utilized to execute particular, task-oriented rationale in a program.

Speed

CWDM can transmit information at speeds of up to 10 Gbps per channel.

DWDM can transmit information at speeds of up to 400 Gbps per channel.

Conclusion

In conclusion, CWDM and DWDM are two diverse innovations utilized for optical organizing. CWDM is utilized for brief removal communication, ordinarily inside a campus or metropolitan range organization, whereas DWDM is utilized for long-separate communication, ordinarily over landmasses. CWDM is less costly and simpler to introduce and keep up with than DWDM, but it contains a lower capacity and shorter extent. On the other hand, DWDM incorporates a higher capacity and longer run, but it is more costly and complex to introduce and keep up.

Updated on: 17-May-2023

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