2. Page 2 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY Understanding DWDM

3. Page 3 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY Traffic - The Future!

4. Page 4 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY The Optical Layer as the new mux fabric

5. Page 5 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY WDM multiplexing technology: The basis for Optical Networking new layer is born: the Optical Layer

6. Page 6 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY Broadband Applications IP ATM SDH / SONET Photonic layer: WDM Photonic layer: WDM The mainstream view New proposals Future Broadband Network Layers

7. Page 7 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY Geographical Distribution of DWDM Technology 1996/1997

8. Page 8 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY Geographical Distribution of DWDM Technology 2001/2002

9. Page 9 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY 1310 nm/1550 nm TDM point-to- point connections with opto-electrical regenerators

10. Page 10 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY Classic WDM point-to-point connection with opto-electrical regenerators

11. Page 11 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY OFA basics TDM point-to-point connections with optical fiber amplifiers (OFAs)

12. Page 12 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY Transmission of multiple channels using WDM systems with 8, 16, 32,... channels (multiplexing of 2.5 Gbit/s signals )

13. Page 13 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY 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,...) 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,...) DWDM test parameters

14. Page 14 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY DWDM spectrum and corresponding test parameters

15. Page 15 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY Channel center wavelength and allowable deviation for a 100 GHz channel spacing

16. Page 16 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY DWDM measurements with an optical spectrum analyzer

17. Page 17 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY OFA monitor output: 8 data signals and ASE spurious spectrum

18. Page 18 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY DWDM system with the recommended reference test points from ITU-T Rec. G.692

19. Page 19 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY 100 GHz channel grid in the range 1530 to 1565 nm from ITU-T Rec. G.692

20. Page 20 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY Division of transmission links into three categories

21. Page 21 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY Possible system wavelengths in the ITU-T 100 GHz channel grid

22. Page 22 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY Optical add/drop multiplexing principleand monitoring of system parameters

23. Page 23 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY Optical add/drop multiplexing principle and monitoring of system parameters

24. Page 24 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY Optical switching in photonic networks using optical cross-connects

25. Page 25 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY Optical cross-connect with OADM

26. Page 26 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY 4-channel DWDM signal with characteristic noise floors and ASE spurious spectrum

27. Page 27 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY Superimposition of the actual data signal and accumulated noise and incorrect interpretation of S/N measurements

28. Page 28 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY Quality monitoring in DWDM systems

29. Page 29 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY  Channel-No.  Actual  Power / -stability  S/N / -stability  Channel-No.  Actual  Power / -stability  S/N / -stability Cyclical recording and stability measurement of

30. Page 30 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY 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 power equalization becomes necessary. Spectrum analysis and power leveladjustment in DWDM systems

31. Page 31 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY Quality monitoring through wavelength-selective bit error analysis (automatic evaluation of bit error histograms)

32. Page 32 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY Gain tilt effect due to cascaded optical fiber amplifiers

33. Page 33 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY  Analysis over the full range of DWDM (1450 to 1650 nm) or pre-defined part !  Detailed system evaluation with markers  Direct feedback on power adjustments Graphical display of an 8-channel DWDM signal

34. Page 34 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY New portable DWDM System Analyzer for 50 GHz/0.4 nm and higher spaced optical DWDM systems with up to 256 channels DWDM System Analyzer OSA-155

35. Page 35 Small confidentiality text on every page, Arial 10pt, white – Change on MASTER PAGE ONLY OSA-155 WDM-channel-selector for in-depth system analysis OSA-155 WDM-channel-selector for in-depth system analysis DWDM System Analyzer OSA-155 Complete Solution: OSA-155 + ANT-20 + CATS Optics