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Lightwave System Modeling at the Lightwave Communication Systems Laboratory

Lightwave System Modeling at the Lightwave Communication Systems Laboratory. Information and Telecommunications Technology Center University of Kansas. Why Numerical Simulation. Dispersion and fiber nonlinearities make analytical approaches nearly impossible Most effects can be included

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Lightwave System Modeling at the Lightwave Communication Systems Laboratory

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  1. Lightwave SystemModeling at theLightwave Communication Systems Laboratory Information and Telecommunications Technology Center University of Kansas The University of Kansas / ITTC

  2. Why Numerical Simulation • Dispersion and fiber nonlinearities make analytical approaches nearly impossible • Most effects can be included • More cost-effective than experiments • They are very useful tools for system design The University of Kansas / ITTC

  3. Simulations Capabilities • Dispersion and nonlinear effects in optical fiber links • Evaluate the performance of TDM/WDM systems • Compare different kinds of fibers • Simulate different waveform transmissions • Explore new system configurations The University of Kansas / ITTC

  4. What effects are Included in Our Simulations ? • Fiber loss and dispersion • Fiber nonlinear effects: • Self-phase modulation (SPM) • Cross-phase modulation (XPM) • Stimulated Raman Scattering (SRS) • Four-wave mixing (FWM) • Polarization mode dispersion (PMD) • Spontaneous amplified emission (ASE) The University of Kansas / ITTC

  5. Modeling Optical Fiber Links • Modeling • Two Parts: Numerical methods and component models • Two Dimensions: TDM and WDM • Two Models: Linear model and nonlinear model • Model architecture • Links (Point to Point) • Fibers (SMF, DSF, DCF, etc.) • Spans (EDFA Span) The University of Kansas / ITTC

  6. The University of Kansas / ITTC

  7. The University of Kansas / ITTC

  8. Simulation Results • TDM system with two fiber types: SMF & DCF • FWM effects in a two-channel WDM system • Interaction between solitons and NRZ signals in WDM systems The University of Kansas / ITTC

  9. A TDM Systemto evaluate the dispersion compensation effect • Two fiber types Standard single mode fiber (SMF) and dispersion compensation fiber (DCF) • Link structure Link Length (600 km) OA OA Tx Rx SMF DCF 100 km 20 km R = 10 Gb/s SMF: 17 ps/km-nm DCF: -85 ps/km-nm EDFA Span ( 120 km) The University of Kansas / ITTC

  10. The University of Kansas / ITTC

  11. The University of Kansas / ITTC

  12. A WDM Systemto evaluate the four-wave mixing (FWM) effect • Two links: Dispersion-shifted fiber (DSF) and TrueWaveTM fiber • Link structures Link Length (200 km) DSF 50 km OA OA Tx Rx Link Length (200 km) OA OA TrueWave 50 km TM Tx Rx The University of Kansas / ITTC

  13. The University of Kansas / ITTC

  14. The University of Kansas / ITTC

  15. l 1 2 3 4 Interaction between Solitons and NRZ Signals in WDM Systems • Objective • Study network transparency for different signal formats • System Configurations • Four-channel WDM: one soliton, three NRZ channels • Channel spacing: 0.8 nm • Bit rate per channel: 10 Gb/s Link Length (1000 km) 34 km OA 6 km OA OA Tx Rx SMF DCF The University of Kansas / ITTC

  16. The University of Kansas / ITTC

  17. The University of Kansas / ITTC

  18. Conclusions • We have developed a powerful, comprehensive modeling tool for lightwave communication systems. • This tool has proven valuable for diagnosing poor performance in systems under development. • We intend to apply this modeling capability to address questions concerning networking evolution issues. The University of Kansas / ITTC

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