Presentazione di PowerPoint

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Research at Parma University in Optical
Communications and Networks
Alberto Bononi Dipartimento di Ingegneria
dellInformazione, Università di Parma, Parco
Area delle Scienze 181A, 43100 Parma, Italy
e-mail bononi_at_tlc.unipr.it
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Gain Dynamics in Optical Amplifiers
( Collaboration with Laval University, Québec,
Canada )
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Scenario
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Saturation-induced Gain Dynamics
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Erbium Doped Fiber Amplifiers
r number of excited ions in EDFA x r/rmax
average inversion
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• S. Novak et al. JLT June 02

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x
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Gain Clamping
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Gain Clamping

• A. Bononi et al. JLT July 99

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• M. Karasek et al. JLT March 00

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• M. Karasek et al. JLT March 00

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Raman Amplifiers

• A. Bononi et al. OFC 02

• single
• pump

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Raman Amplifiers

• Multiple
• pumps

• A. Bononi et al. OFC 03

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Ultra-wide bandwidth Raman

• A. Bononi et al. OFT 04 (91-123)

• 10 pumps, 80 WDM channels ON/OFF modulated

Dynamic error lt 0.3 dB

• Computation time on a laptop model 2 min
  exact 2 hours!

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Semiconductor Optical Amplifiers

• G. P. Agrawal et al. JQE Nov 89

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Gain Clamping
GC-SOA

• Soulage et al., Alcatel, 1994

LOA

• Francis et al., Genoa, 2001

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2003 MIUR Project Wonder
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WDM Long-Haul Design
( Collaboration with Alcatel, Marcoussis, France
)
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Scenario
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DM long-haul Terrestrial Link
zA
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OOK-NRZ Signal
1 0 1 1 0
ImE
0
1
0
ReE
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Rx Field
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ASE Spectrum
P(t)
t
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Linear PG Model
No pre-, post-comp.
Red quadrature ASE

Blue in-phase ASE
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Impact on BER
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Failure of Linear PG Model
avg F0.55 rad/p, D8 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 per frame )
  
• What happens at smaller OSNRs?

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Consequences on systems with FEC
10 Gb/s single-channel NRZ system, 20?100 km, D8
ps/nm/km, Din0.
Noiseless optimized Dpre, Dpost
end-line OSNR11 dB/0.1nm
0.2
0.4
0.6
0.8
Nonlinear phase rad/?
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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