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17 TH IEEE/LEOS Conference Puerto Rico, 7-11 of November, 2004

Modeling Of Optical Coupling To Multimode Polymer Waveguides: Axial And Lateral Misalignment Tolerance. Guoyu Yu and David R. Selviah Department of Electronic and Electrical Engineering University College London. Outline Modelling strategy VCSEL modelling Coupling optics

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17 TH IEEE/LEOS Conference Puerto Rico, 7-11 of November, 2004

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  1. Modeling Of Optical Coupling To Multimode Polymer Waveguides: Axial And Lateral Misalignment Tolerance Guoyu Yu and David R. Selviah Department of Electronic and Electrical Engineering University College London Outline • Modelling strategy • VCSEL modelling • Coupling optics • Receiver modelling • Results and Discussion 17TH IEEE/LEOS Conference Puerto Rico, 7-11 of November, 2004

  2. Modeling Diagram Power meter reading varies with relative lateral and axial misalignment between VCSEL and waveguide Power BER 0110 Driver PRBS VCSEL Guide Receiver Time information such as eye diagram and thus system BER obtained to meet general specification Eye

  3. Spatial Field Distribution VCSEL active area diameter=7 µm LG00 LG10 LG11 LG01 Polarisation direction

  4. Polar Plot of 4 modes LG10 LG00 LG11 LG01

  5. Weighted 4 modes

  6. VCSEL Output Simulated (left) VCSEL LI output compared with data from manufacture (right) Small-signal transfer function at 25 oC, bias of 5 and 10 mA Transient response of single-mode VCSEL

  7. Spatial Output

  8. Spatial Output

  9. Results Four Modes Single Mode

  10. Power Contour at -1 dB Single Mode Four Modes From inner most, guide with=10, 20, 30, 40, 50, 60, 70 micron From inner most, guide with=10, 20, 30, 40, 50, 60, 70 micron • The lateral and axial tolerance increase monomatically with the increased guide width (10-60 µm). • For guide of 100 µm width, tolerance is not improved due to modal noise. • The lateral and axial tolerance increase monomatically with the increased guide width (10-60 µm). • Axial tolerance is not as good as single mode due to mode divergence.

  11. m m m m m m m m Guide Width=80 Guide Width=80 50 40 30 20 10 0 -10 -20 -30 -40 -50 0 100 200 300 400 500 600 700 800 900 1000 Larger Guides Guide Width=100 1 mode 1 mode Guide Width=100 4 modes 4 modes

  12. Experiment Model: w=50 µm, xi=100 µm, zi=100 µm. Experiment: x scan range: 0-62 µm.

  13. Conclusion • Increased guide width result in improved lateral and axial misalignment tolerance if the guide width is less than receiver aperture size. • Modal noise will affect the tolerance level when guide width is greater than receiver aperture size. Acknowledgement • EPSRC and Xyratex for financial support • Anibal Fernandez and Frank Tooley for useful discussion

  14. VCSEL Cylindrical geometry uniform current injection linear gain

  15. Receiver

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