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Understanding DWDM. Traffic - The Future!. The Optical Layer as the new mux fabric. WDM multiplexing technology: The basis for Optical Networking. new layer is born: the Optical Layer. Broadband Applications. Broadband Applications. IP. IP. ATM. ATM. SDH / SONET. SDH / SONET.

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PowerPoint Slideshow about ' Understanding DWDM' - kathleen-andrews


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Presentation Transcript
future broadband network layers

Broadband Applications

Broadband Applications

IP

IP

ATM

ATM

SDH / SONET

SDH / SONET

Photonic

layer: WDM

Photonic

layer: WDM

New proposals

The mainstream view

Future Broadband Network Layers
slide12
Transmission of multiple channels using WDM systems with 8, 16, 32, ... channels (multiplexing of 2.5 Gbit/s signals)
dwdm test parameters
DWDM test parameters
  • Power levels of the individual carriers
  • to ensure even power distribution over the entire bandwidth
  • to notice immediately whether any channels have dropped out
  • Channel wavelength / Channel spacing
  • to indicate possible wavelength shifts for individual laser sources
  • Signal-to-noise ratio
  • to ensure that error-free transmission is possible in each data channel
  • Overall power
  • to check the optical fiber amplifiers of the system
  • to check against safety limit of currently +17 dBm
  • Crosstalk
  • to provide a quality indication for the system components (couplers, ...)
slide23
Superimposition of the actual data signal and accumulated noise and incorrect interpretation of S/N measurements
cyclical recording and stability measurement of
Cyclical recording and stability measurement of
  • Channel-No.
    • Actual 
      • Power / -stability
        • S/N / -stability
spectrum analysis and power leveladjustment in dwdm systems
Spectrum analysis and power leveladjustment in DWDM systems

Due to the irregular gain/wavelength response of todays EDFAs cascading of optical amplifiers result in power shifts !

To minimize crosstalk effects ( Rx side) of each DWDM channel powerequalization becomes necessary.

slide27
Quality monitoring through wavelength-selective bit error analysis (automatic evaluation of bit error histograms)
slide28

DWDM System AnalyzerOSA-155

New portable DWDM System Analyzer for 50 GHz/0.4 nm and higher spaced optical DWDM systemswith up to 256 channels

slide29

DWDM System Analyzer OSA-155

Complete Solution:

OSA-155

+ANT-20

+CATS Optics

OSA-155

WDM-channel-selector

for

in-depth system analysis

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