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Optimisation of the Key SOA Parameters for Amplification and Switching

Optimisation of the Key SOA Parameters for Amplification and Switching. By: Supervision Team:. Ahmed Abd El Aziz Shalaby. Dr. Wai Pang Ng Prof. Zabih Ghassemlooy Prof. Moustafa Hussien Dr Razali Ngah. Proposed core optical router. Source / target node. Core Network. Introduction.

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Optimisation of the Key SOA Parameters for Amplification and Switching

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  1. Optimisation of the Key SOA Parameters for Amplification and Switching By: Supervision Team: Ahmed Abd El Aziz Shalaby Dr. Wai Pang Ng Prof. ZabihGhassemlooy Prof. Moustafa Hussien Dr RazaliNgah

  2. Proposed core optical router Source / target node Core Network

  3. Introduction All-optical router

  4. Introduction Symetric Mach-Zehnder Interferometer(SMZI)

  5. Research Aim

  6. Research Aim • To design a bi-directional SMZ and implement it in the router to reduce components, time and cost.

  7. Challenges • To optimize the performance of the SOA to be adapted for bi-directional operation. • To overcome the slow time recovery of the SOA gain. • To propose a bi-directional model for the SOA. • To design a bi-directional model for the SMZ and implement it in the proposed router.

  8. Output signals Injection current (I) Output facet L Input facet of active region Input signals SOA structure w H

  9. SOA structure

  10. Segmentisation model of the SOA t=0 t=l/vg t=L/vg Ni input signal output signal N(1) N(5)

  11. Results • Normalised gain response of the SOA with no input signal.

  12. Results Injection of the input pulse • Normalised gain response of the SOA due to the injection of a short input pulse.

  13. Results Injection of the continuous wave • Normalised gain response of the SOA due to the injection of a continuous input signal. Saturation gain

  14. SOA as an Amplifier

  15. SOA for amplification • Condition: • The signal should not be affected by the SOA nonlinear effect (i.e: SOA gain depletion should not reach saturation value). • Note: • The reference is the saturation value for a 1mW continuous input signal.

  16. SOA for amplification • The output gain corresponding to the input power at different bias currents. • Reference saturation gain: • at I=150mA 66 • at I=200mA 96 • at I=250mA 127

  17. SOA as a Switch

  18. SOA for switching • Condition: • The signal should be affected by the nonlinearity of the SOA and achieve a 180o phase shift for the deconstructive interference. (i.e: SOA gain depletion of a control pulse (CP) should reach the gain saturation value). • Note: • A control pulse (CP) is required to be launched to the SOA, then the input signal should be injected in order to achieve the 180o phase shift.

  19. SOA for switching • The saturation control pulse (CP) for the corresponding input power at different bias currents.

  20. SOA Gain Recovery

  21. SOA gain recovery • SOA gain dependence on the bias current.

  22. SOA gain recovery Recovery time • Normalised gain response of the SOA due to the injection of a short input pulse.

  23. SOA gain recovery • Normalised gain response of the SOA due to partial increase of the bias current.

  24. SOA gain recovery Partial increase of bias current t=0 t=l/vg t=L/vg Propagating input signal Propagating output signal

  25. SOA gain recovery • SOA gain recovery due to the additional of different bias currents. Recovery time=37ps Improvement of: 86% for 95% recovery 90% for 99% recovery 84% for 100% recovery

  26. SOA gain recovery • SOA bit rate due to the additional bias current. SOA bit rate=27.027 Gbps Improvement of: 7.5 times at 95% recovery

  27. SOA gain recovery • Time needed to apply additional bias current. Time needed : 35ps for 90mA 154ps for 10mA

  28. Current Work

  29. Bi-directional SOA model

  30. Bi-directional SOA model t=0 t=l/vg t=L/vg Propagating output signal Propagating input signal Co-propagating output signal Co-propagating input signal

  31. Bi-directional SMZ design

  32. Uni-directional SMZ

  33. Bi-directional SMZ

  34. Future Work

  35. Future work • Practical work on the SMZ. • The replacement of active components in the router by passive components (FBGs) such as demultiplexing, add/drop devices, filtering, and switching . • Solving the contention resolution problem using a novel multiplexing solution.

  36. Conclusion • The SOA is modelled using a segmentation method. • The effect of input parameters on the gain and carrier density response of an SOA is presented. • Optimum performance conditions are investigated in which the SOA can be used as a standalone amplifier and in a SMZ switch. • The dependence on of the SOA on the bias current is presented.

  37. Conclusion • Results show an acceleration in the gain recovery time due to partially increasing the bias current applied to the SOA. • SOA gain recovery time and bit rate corresponding to the additional bias current is investigated.

  38. Thank You

  39. Thank you

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