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H. Le Minh, Z. Ghassemlooy and Wai Pang Ng Optical Communications Research Group

Simulation of All-optical Packet Routing employing PPM-based Header Processing in Photonic Packet Switched Core Network. H. Le Minh, Z. Ghassemlooy and Wai Pang Ng Optical Communications Research Group Northumbria University, UK http://soe.unn.ac.uk/ocr/.

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H. Le Minh, Z. Ghassemlooy and Wai Pang Ng Optical Communications Research Group

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  1. Simulation of All-optical Packet Routing employing PPM-based Header Processing in Photonic Packet Switched Core Network H. Le Minh, Z. Ghassemlooy and Wai Pang Ng Optical Communications Research Group Northumbria University, UK http://soe.unn.ac.uk/ocr/ First International Conference on Communications and Electronics HUT - ICCE 2006, 10th-11th Oct. 2006 Hanoi, Vietnam

  2. Contents • Introduction • PPM-Header Processing Overview • Operation principle • Clock extraction • PPM address conversion • PPM header correlation • All-optical flip-flop • Wavelength conversion • Simulation Results • Summary

  3. Contents • Introduction • PPM-Header Processing Overview • Operation Principle • Clock Extraction • PPM Address Conversion • PPM Header Correlation • All-optical Flip-Flop • Wavelength Conversion • Simulation results • Summary

  4. Introduction – All-optical network Network transparency  All-optical core router • Processing, switching and routing in optical domain  high throughput • Packet format is preserved 1

  5. Contents • Introduction • PPM-Header Processing Overview • Operation Principle • Clock Extraction • PPM Address Conversion • PPM Header Correlation • All-optical Flip-Flop • Wavelength Conversion • Simulation results • Summary

  6. 4-bit OP 1 ? OP 2 OP 3 Routing Table i 1001B = 9D Convert to pulse-position routing table Ref: [1] Z. Ghassemlooy et al., NOC 2005, UK, pp. 209-216 [2] Z. Ghassemlooy et al., ICTON 2005, Spain, Vol. 2, pp. 50-53 2

  7. 4-bit OP 1 OP 2 OP 3 Router Operation Principle Implementation 1M router (up to M input packets at M wavelengths) 3

  8. Router - PPM-HP PPM-HP module 4

  9. Contents • Introduction • PPM-Header Processing Overview • Operation Principle • Clock Extraction • PPM Address Conversion • PPM Header Correlation • All-optical Flip-Flop • Wavelength Conversion • Simulation results • Summary

  10. Router - PPM-HP - Clock Extraction Clock Extraction Clk Clock, header and payload:- have the same intensity, polarization and wavelength • Clock extraction requirements: • Asynchronous and ultrafast response • High on/off contrast ratio of extracted clock 5

  11. Polarization Beam Splitter (PBS) Polarization Controller (PC) Router - PPM-HP - Clock Extraction CP1 Clk GCP 12 12 SOA1 SOA1 22 22  SMZ-2 SMZ-1 12 12 22 22 22 22 in in 22 22 SOA2 SOA2 SW SW CP2 Optical fiber span Amplifier Attenuator Optical delay 6

  12. Polarization Beam Splitter (PBS) Polarization Controller (PC) Router - PPM-HP - Clock Extraction GCP 12 12 SOA1 SOA1 22 22  SMZ-2 SMZ-1 12 12 22 22 22 22 in in 22 22 SOA2 SOA2 SW SW Optical fiber span Amplifier Attenuator Optical delay 6

  13. Polarization Beam Splitter (PBS) Polarization Controller (PC) Router - PPM-HP - Clock Extraction Clk GCP 12 12 SOA1 SOA1 22 22  SMZ-2 SMZ-1 12 12 22 22 22 22 in in 22 22 SOA2 SOA2 SW SW Optical fiber span Amplifier Attenuator Optical delay 6

  14. (a) (b) (c) Router - PPM-HP - Clock Extraction • Input packets • Extracted clock pulse by single SMZ. The residual signal intensities are high, but eventually fading due to SOA gain is saturated with the stream of high-powered control pulses • Extracted clock pulse by two-inline SMZs. The residual signals are suppressed  improving the on/off contrast ratio 7 Ref: Z. Ghassemlooy et al., ICTON 2006, UK, Vol. 4, pp. 64-67

  15. Contents • Introduction • PPM-Header Processing Overview • Operation Principle • Clock Extraction • PPM Address Conversion • PPM Header Correlation • All-optical Flip-Flop • Wavelength Conversion • Simulation results • Summary

  16. Router - PPM-HP - Address Conversion (a) (b) (b) (a) 8

  17. Contents • Introduction • PPM-Header Processing Overview • Operation Principle • Clock Extraction • PPM Address Conversion • PPM Header Correlation • All-optical Flip-Flop • Wavelength Conversion • Simulation results • Summary

  18. Router - PPM-HP - Header Correlation Matched xPPM(t) • SMZ-based AND gate: only one bit-wise operation! • SOA gain recovery is no longer an issue, since it is saturated only once for header recognition E2(t) Ref:R. P. Schreieck et al.,IEEEQuantum Elec., Vol. 38, pp. 1053-1061, 2002 9

  19. Contents • Introduction • PPM-Header Processing Overview • Operation Principle • Clock Extraction • PPM Address Conversion • PPM Header Correlation • All-optical Flip-Flop • Wavelength Conversion • Simulation results • Summary

  20. Router - PPM-HP - All-optical Flip-Flop • Operate at < nanoseconds responses • Multiple SET/RESET pulses for compensating the actual loop delay (~ hundreds • of picoseconds) and for speeding up the transient ON/OFF states of Q output 10

  21. Router - PPM-HP - All-optical Flip-Flop SET (blue) / RESET (red) Q output SOA1 gain (blue) / SOA2 gain (red) ON/OFF Contrast Ratio 11

  22. Contents • Introduction • PPM-Header Processing Overview • Operation Principle • Clock Extraction • PPM Address Conversion • PPM Header Correlation • All-optical Flip-Flop • Wavelength Conversion • Simulation results • Summary

  23. Data packet @ 1 Data packet @ 2 SOA1 CW @ 2 22 22 SOA2 Router - PPM-HP - Wavelength Conversion Ref: Y. Ueno et al.,ECOC 2002 12

  24. Contents • Introduction • PPM-Header Processing Overview • Operation Principle • Clock Extraction • PPM Address Conversion • PPM Header Correlation • All-optical Flip-Flop • Wavelength Conversion • Simulation results • Summary

  25. 4-bit OP 1 OP 2 OP 3 Simulation – 13 Router 13

  26. Simulation – Parameters 14

  27. Simulation – Input / Clock Extraction Input packets (3 wavelengths) Input spectrum / Extracted clock pulses 14

  28. Simulation – Router Outputs Router output 1 Spectrum at router output 1 15

  29. Simulation – Router Outputs Router output 3 Router output 2 16

  30. Simulation – Multiple-hop OSNR 1- Multiple-hop OSNR due to accumulated ASE 2- Predicted & simulated OSNRs Ref: Z. Ghassemlooy et al., IEEE 49th GLOBECOM 2006, USA, (accepted) 17

  31. Contents • Introduction • PPM-Header Processing Overview • Operation Principle • Clock Extraction • PPM Address Conversion • PPM Header Correlation • All-optical Flip-Flop • Wavelength Conversion • Simulation results • Summary

  32. Summary • PPM-HP • Provides ultrafast header processing • Reduces the number of routing table entries • Avoids the SOA recovery time during header correlation • Operates in a large BW as employing SOA • Supports multiple transmitting modes (uni/multi/broadcasting) • Offers add/drop edge node scalability • Further investigation • ASE noise sources • Timing jitter and pulse dispersion effects on PPM-HP • Effective wavelength conversion • IP-based optical transparent network 18

  33. Thank you

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