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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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Presentation Transcript



New layer is born the optical layer

WDM multiplexing technology:

The basis for Optical Networking

new layer is born: the Optical Layer


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


Geographical distribution of dwdm technology 1996 1997
Geographical Distribution of DWDM Technology 1996/1997


Geographical distribution of dwdm technology 2001 2002
Geographical Distribution of DWDM Technology 2001/2002


1310 nm 1550 nm tdm point to point connections with opto electrical regenerators
1310 nm/1550 nm TDM point-to-point connections with opto-electrical regenerators


Classic wdm point to point connection with opto electrical regenerators
Classic WDM point-to-point connection with opto-electrical regenerators


Tdm point to point connections with optical fiber amplifiers ofas
TDM point-to-point connections with optical fiber amplifiers (OFAs)

OFA basics


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, ...)










4 channel dwdm signal with characteristic noise floors and ase spurious spectrum
4-channel DWDM signal with characteristic noise floors system parametersand ASE spurious spectrum


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 noise

  • Channel-No.

    • Actual 

      • Power / -stability

        • S/N / -stability


Spectrum analysis and power leveladjustment in dwdm systems
Spectrum analysis and power leveladjustment noise 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.


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


DWDM System Analyzer analysis OSA-155

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


DWDM System Analyzer OSA-155 analysis

Complete Solution:

OSA-155

+ANT-20

+CATS Optics

OSA-155

WDM-channel-selector

for

in-depth system analysis


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