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DWDM Technology Optical Network system
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Contents

• DWDM
• Optical Networks
• Principles of Operation
• Applications
• Future enhancement
• Conclusion

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Definitions

• Dense Wave Division Multiplexing is a technology
  that utilizes the properties of refracted light
  to both combine and separate optical signals
  based on their wavelengths within the optical
  spectrum.
• Optical network system is the utilization of
  fiber systems in the transfer and management of
  data from location to location across the fiber
  system.

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What is DWDM?

• It transmits multiple data signals using
  different wavelengths of light through a single
  fiber.
• Incoming optical signals are assigned to specific
  frequencies within a designated frequency band.
• The capacity of fiber is increased when these
  signals are multiplexed onto one fiber

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What is DWDM?

• Transmission capabilities is 4-8 times of TDM
  Systems with the help of Erbium doped optical
  amplifier.
• EDFAs increase the optical signal and dont
  have to regenerate signal to boost it strength.
• It lengthens the distances of transmission to
  more than 300 km before regeneration .

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Why DWDM?

• Unlimited Transmission Capacity
• Transparency
• Scalability
• Dynamic Provisioning

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Structure of DWDM Link
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DWDM Components

• Transmitter Laser with precise stable
  wavelength.
• Link Optical fiber that exhibits low loss and
  transmission performance in relevant wavelength
  spectra.
• Receiver Photo detectors and Optical
  de-multiplexers using thin film filters or
  diffractive elements.
• Optical add/drop multiplexers and optical cross
  connect components.

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Advantages of DWDM

• The DWDM point-to-point architecture is simple
  to build and troubleshoot .
• It enables protocol transparency, incremental
  growth, and capacity expansion over time, while
  dramatically reducing start-up costs.
• Point-to-point solutions are also extremely
  efficient.
• No amplifiers or additional equipment required.

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Elements of Optical Networks

• Optical Amplifiers
• Wavelength Converters
• Optical Add/Drop Multiplexer
• Optical Cross Connect
• Optical Gateways

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Optical Network Services

• Lightpath creation
• Lightpath deletion
• Lightpath modification
• Lightpath status enquiry

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Categorizing Optical Networks
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Backbone network system
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System configuration
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Up grade scenario
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Next generation network
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Cross talk optical system
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Optical shared protection ring
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Applications

• DWDM is ready made for long-distance
  telecommunications operators that use either
  point-to-point or ring topologies.
• Building or expanding networks
• Network wholesalers can lease capacity, rather
  than entire fibers.
• The transparency of DWDM systems to various bit
  rates and protocols.
• Utilize the existing thin fiber
• DWDM improves signal transmission

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Future road map

• Two-way video communication
• Digital video for our everyday use at home and at
  work.
• Change from voice telephony to digital data heavy
  with video to require multiplying backbone
  transmission capacity.

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Conclusion

• A DWDM system with 32 channels and
  320-Gbit/s total transmission capacity was
  developed. The optical power of each channel was
  kept constant by a newly developed EDFA level
  controller. Moreover, a next generation DWDM
  system, such as 128-wavelengthchannel
  optical-path networking, is under development.
  The optical protection ring using OXC is expected
  to provide a reliable IP-over-DWDM network.

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References

• www.google.com
• www.seminarsonly.com
• Optical fiber communications - john M.
  senior
• http//www.ee.ucl.ac.uk/lcs/papers99/dbojic.pdf
• www.wikipedia.com

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• THANK YOU