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Reach extension of passive optical networks using semiconductor optical amplifiers

Reach extension of passive optical networks using semiconductor optical amplifiers. A E Kelly, C. Michie, I. Andonovic, J. McGeough, S Kariaganopoulos. Standard Passive Optical Networks. GPON 1:32 Reach 10-20km. Extended Reach Passive Optical Networks.

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Reach extension of passive optical networks using semiconductor optical amplifiers

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  1. Reach extension of passive optical networks using semiconductor optical amplifiers A E Kelly, C. Michie, I. Andonovic, J. McGeough, S Kariaganopoulos

  2. Standard Passive Optical Networks GPON 1:32 Reach 10-20km

  3. Extended Reach Passive Optical Networks • Electronic regeneration cannot be used as it results in Preamble erosion due to burst mode locking time

  4. Significant ASE levels SOA Passive Optical Networks 1300nm backhaul VOA2 VOA1 insertion loss α receiver 1310nm transmitter 1310nm 20 nm filter • VOA1 represents access loss – split plus some link loss • VOA2 predominately trunk loss • 1300 nm and 1.25/2.5 Gbit/s; dispersion neglected

  5. Pin PIN or APD Power Budget • Simple linear model pin receiver Noise Figure shot noise terms thermal noise

  6. Pin PIN or APD Power Budget • Simple linear model APD receiver Noise Figure shot noise terms thermal noise APD Multiplication and Noise Factor

  7. Power Budget • SNR modified to account for ER of transmitter • – at best 10 dB

  8. Baseline calculations data modelled for commercial pin/APD APD Neo Photonics PTB3J88-5638T-SC/PC+ pin – OCP- TRXAG1M

  9. Inclusion of Amplifier • Build upon a model of the SNR to include the noise terms associated with amplifier

  10. Significant ASE levels VOA2 VOA1 SOA insertion loss α receiver 1310nm transmitter 1310nm 20 nm filter 0v Extinction Ratio further degraded due to ASE

  11. APD based Receiver • Assumptions • -28 dBm sensitivity for BTB un amplified with 10 dB ER • M=10 • thermal noise estimated to give sensitivity of -28dBm for 10-10 BER (value specified on data sheets) • Psat of SOA +13 dBm • NF 7 dB

  12. Baseline 0.8nm filter 10 nm filter 20 nm filter 20 nm filter ER not considered Amplified APD Receiver

  13. Influence of Optical Filtering

  14. SOA Post Amplifier Losses • Position amplifier to compensate for splitting and reach losses • SOA Psat limited to +13 dBm • Gain adjusted accordingly Backhaul Splitter (Access) loss insertion loss α ONT OLT receiver 1310nm 20 nm filter

  15. booster margin mid span margin benefit pre-amp margin System Power Margins GPON

  16. Margin Enhancement for Amplified GPON 128 split

  17. Distance versus number of users for each case Psat limited Gain limited 32 Split 64 Split 512 Split NF limited GPON: 32 split 64 split 128 split

  18. SOA Experiment VOAl VOA 1300 tx 1300 nm receiver Channel Drop OSA (filter)

  19. Experimental Validation

  20. Constant BER curve with filter width

  21. Experimental Margin Enhancement

  22. Conclusions • Number of users and backhaul distance can be considerably increased by using SOA based amplification • Required SOA specification depends on placement within network • A single SOA cannot meet these requirements • Variable gain clamping schemes? Key Publications Russell P. Davey, Daniel B. Grossman, Michael Rasztovits-Wiech, David B. Payne, Derek Nesset, A. E. Kelly, Albert Rafel, ShamilAppathurai, and Sheng-Hui Yang “Long-Reach Passive Optical Networks” Journal of Lightwave Technology, Vol. 27, Issue 3, pp. 273-291 February 2009 (invited tutorial paper) High Performance Semiconductor Optical Amplifier Modules at 1300nm”A.E.Kelly, C.Michie, I.Armstrong, I.Andonovic, C. Tombling, J.McGeough and B.C.Thomsen, Photon.Tech.Lett, Vol.18, No.24, pp 2674-2676, 2006 “The Dynamic Gain Modulation Performance of Adjustable Gain-Clamped Semiconductor Optical Amplifiers (AGC-SOA)” Liu, L. Michie, C. Kelly, A. E. Andonovic, I., Journal of Lightwave Technology , Volume: 29 Issue: 22 pp 3483 – 3489, 2011.

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