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Research at Parma University in Optical Communications and Networks

Outline. Gain Dynamics in Optical Amplifiers WDM Long-Haul Design. Research at Parma University in Optical Communications and Networks. Alberto Bononi Dipartimento di Ingegneria dell’Informazione, Università di Parma , Parco Area delle Scienze 181A, 43100 Parma, Italy

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Research at Parma University in Optical Communications and Networks

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  1. Outline • Gain Dynamics in Optical Amplifiers • WDM Long-Haul Design Research at Parma University in Optical Communications and Networks Alberto Bononi Dipartimento di Ingegneria dell’Informazione, Università di Parma, Parco Area delle Scienze 181A, 43100 Parma, Italy e-mail: bononi@tlc.unipr.it A. Bononi, 2nd Korea-Italy S&T Forum1/30

  2. Gain Dynamics in Optical Amplifiers ( Collaboration with Laval University, Québec, Canada ) A. Bononi, 2nd Korea-Italy S&T Forum2/30

  3. Scenario A. Bononi, 2nd Korea-Italy S&T Forum3/30

  4. Saturation-induced Gain Dynamics A. Bononi, 2nd Korea-Italy S&T Forum4/30

  5. Y. Sun et al. JSAQE Aug 97 A. Bononi et al. JLT May 98 Gain • = fluorescence time (10 ms) Q = signal and pump fluxes [photons/sec] x Erbium Doped Fiber Amplifiers r = number of excited ions in EDFA x = r/rmax average inversion A. Bononi, 2nd Korea-Italy S&T Forum5/30

  6. S. Novak et al. JLT June 02 A. Bononi, 2nd Korea-Italy S&T Forum6/30

  7. A. Bononi, 2nd Korea-Italy S&T Forum7/30

  8. x A. Bononi, 2nd Korea-Italy S&T Forum8/30

  9. Gain Clamping A. Bononi, 2nd Korea-Italy S&T Forum9/30

  10. Gain Clamping A. Bononi et al. JLT July 99 A. Bononi, 2nd Korea-Italy S&T Forum10/30

  11. M. Karasek et al. JLT March 00 A. Bononi, 2nd Korea-Italy S&T Forum11/30

  12. M. Karasek et al. JLT March 00 A. Bononi, 2nd Korea-Italy S&T Forum12/30

  13. Pump attenuation Pump depletion % Walk-off Raman Amplifiers A. Bononi et al. OFC 02 single pump A. Bononi, 2nd Korea-Italy S&T Forum13/30

  14. Raman Amplifiers Multiple pumps A. Bononi et al. OFC 03 A. Bononi, 2nd Korea-Italy S&T Forum14/30

  15. Ultra-wide bandwidth Raman A. Bononi et al. OFT 04 (91-123) • 10 pumps, 80 WDM channels ON/OFF modulated Dynamic error < 0.3 dB • Computation time on a laptop: model: 2 min; exact: 2 hours! A. Bononi, 2nd Korea-Italy S&T Forum15/30

  16. Semiconductor Optical Amplifiers G. P. Agrawal et al. JQE Nov 89 A. Bononi, 2nd Korea-Italy S&T Forum16/30

  17. Gain Clamping GC-SOA Soulage et al., Alcatel, 1994 LOA Francis et al., Genoa, 2001 A. Bononi, 2nd Korea-Italy S&T Forum17/30

  18. 2003 MIUR Project Wonder A. Bononi, 2nd Korea-Italy S&T Forum18/30

  19. WDM Long-Haul Design ( Collaboration with Alcatel, Marcoussis, France ) A. Bononi, 2nd Korea-Italy S&T Forum19/30

  20. Scenario A. Bononi, 2nd Korea-Italy S&T Forum20/30

  21. RX OF EF Bo Be N D A Dispersion Map DM long-haul Terrestrial Link zA A. Bononi, 2nd Korea-Italy S&T Forum21/30

  22. A. Bononi, 2nd Korea-Italy S&T Forum22/30

  23. P(t) P(t) P t t Im[E] Re[E] 1 F Nonlinear phase OOK-NRZ Signal 1 0 1 1 0 Im[E] 0 1 0 Re[E] A. Bononi, 2nd Korea-Italy S&T Forum23/30

  24. Im[E] quadrature ASE Re[E] In-phase ASE Rx Field A. Bononi, 2nd Korea-Italy S&T Forum24/30

  25. 8 Si(f) Parametric Gain 4 Normalized PSD [dB] 0 Sr(f) P -4 frequency f PSD [dB] Si(f) N0 Sr(f) frequency f ASE Spectrum P(t) t A. Bononi, 2nd Korea-Italy S&T Forum25/30

  26. Linear PG Model No pre-, post-comp. Red : quadrature ASE » Blue: in-phase ASE A. Bononi, 2nd Korea-Italy S&T Forum26/30

  27. Decision Threshold (in optical domain) Impact on BER A. Bononi, 2nd Korea-Italy S&T Forum27/30

  28. Failure of Linear PG Model avg F=0.55 rad/p, D=8 ps/nm/km • At large end-line OSNR (25 dB/0.1 nm) good match between linear PG model (dashed) and Monte-Carlo simulations based on the beam propagation method (BPM) (solid, ~30 min simulation time perframe) What happens at smaller OSNRs? A. Bononi, 2nd Korea-Italy S&T Forum28/30

  29. 14 Standard analysis true value with FEC 12 Uncoded log(BER) 10 Q Factor [dB] CG 8 Q factor [dB] 6 0 1 Consequences on systems with FEC 10 Gb/s single-channel NRZ system, 20100 km, D=8 ps/nm/km, Din=0. Noiseless optimized Dpre, Dpost end-line OSNR=11dB/0.1nm 0.2 0.4 0.6 0.8 Nonlinear phase [rad/] A. Bononi, 2nd Korea-Italy S&T Forum29/30

  30. Conclusion I provided a few samples of our recent research collaborations on the design of the physical layer of optical networks. More information can be found on our web site: www.tlc.unipr.it A. Bononi, 2nd Korea-Italy S&T Forum30/30

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