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Modal and Material Dispersion

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Modal and Material Dispersion. Daniil Y. Gladkov. Outline. Hardware Types of Dispersion Data Transfer Function Future Project Proposals. Why does dispersion matter ?.

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Modal and Material Dispersion

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  1. Modal and Material Dispersion Daniil Y. Gladkov

  2. Outline • Hardware • Types of Dispersion • Data • Transfer Function • Future Project Proposals

  3. Why does dispersion matter ? • Understanding the effects of dispersion in optical fibers is quintessential in optical communications in order to minimize pulse spreading. • Pulse compression due to negative dispersion can be used to shorten pulse duration in chirped pulse lasers

  4. Hardware and setup

  5. Laser Diode Power Output Profile

  6. Pulsed Fiber Laser System From Wesley Hughes and Jared Green’s Presentation

  7. Pulse Generator and Amplifier

  8. Modal Dispersion • Pulse Spreading: where • Number of modes: where • Fiber Used: ,

  9. Material Dispersion • Pulse Spreading: • Dispersion Coefficient:

  10. Anomalous Dispersion • Pulse’s higher frequency have faster phase velocity than the lower frequency components • Responsible for negative dispersion, pulse compression, and soliton formation • http://www.falstad.com/dispersion/normal.html

  11. 150 Picosecond Pulse Generator

  12. 1 Nanosecond Pulse with Amplifier

  13. Femtosecond Pulse Laser

  14. 1km, 2km, 3km Fiber with Femtosecond Pulse Laser Results • 1 km - pulse width: 215 psσ: 572ps • 2 km - pulse width: 385 psσ: 2.4ps • 3 km - pulse width: 382 psσ: 1.62ps • Results do not agree with theory

  15. 20.56 km Fiber with 1 Nanosecond Pulse Laser Results

  16. Multimode Fiber

  17. Transfer Function

  18. Input Pulse Fitting

  19. Output Pulse Fitting

  20. Computation of Transfer Function

  21. Suggestions for Future Projects • Use Optical amplifier to boost output signal • Spectral profiling of pulses • Anomalous Dispersion modeling • Better fitting and transfer function modeling • High powered laser to overcome attenuation • More variations of fiber lengths • Soliton formation

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