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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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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

e-mail: [email protected]

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Research at parma university in optical communications and networks

Gain Dynamics

in

Optical Amplifiers

( Collaboration with Laval University, Québec, Canada )

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Research at parma university in optical communications and networks

Scenario

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Research at parma university in optical communications and networks

Saturation-induced

Gain Dynamics

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Research at parma university in optical communications and networks

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

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Research at parma university in optical communications and networks

S. Novak et al. JLT June 02

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Research at parma university in optical communications and networks

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Research at parma university in optical communications and networks

x

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Research at parma university in optical communications and networks

Gain Clamping

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Research at parma university in optical communications and networks

Gain Clamping

A. Bononi et al. JLT July 99

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Research at parma university in optical communications and networks

M. Karasek et al. JLT March 00

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Research at parma university in optical communications and networks

M. Karasek et al. JLT March 00

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Research at parma university in optical communications and networks

Pump

attenuation

Pump depletion %

Walk-off

Raman Amplifiers

A. Bononi et al. OFC 02

single

pump

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Research at parma university in optical communications and networks

Raman Amplifiers

Multiple

pumps

A. Bononi et al. OFC 03

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Research at parma university in optical communications and networks

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!

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Research at parma university in optical communications and networks

Semiconductor Optical Amplifiers

G. P. Agrawal et al. JQE Nov 89

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Research at parma university in optical communications and networks

Gain Clamping

GC-SOA

Soulage et al., Alcatel, 1994

LOA

Francis et al., Genoa, 2001

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Research at parma university in optical communications and networks

2003 MIUR Project Wonder

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Research at parma university in optical communications and networks

WDM

Long-Haul

Design

( Collaboration with Alcatel, Marcoussis, France )

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Research at parma university in optical communications and networks

Scenario

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Research at parma university in optical communications and networks

RX

OF

EF

Bo

Be

N

D

A

Dispersion

Map

DM long-haul Terrestrial Link

zA

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Research at parma university in optical communications and networks

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Research at parma university in optical communications and networks

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]

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Research at parma university in optical communications and networks

Im[E]

quadrature

ASE

Re[E]

In-phase

ASE

Rx Field

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Research at parma university in optical communications and networks

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

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Research at parma university in optical communications and networks

Linear PG Model

No pre-, post-comp.

Red : quadrature ASE

»

Blue: in-phase ASE

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Research at parma university in optical communications and networks

Decision

Threshold

(in optical

domain)

Impact on BER

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Research at parma university in optical communications and networks

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?

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Research at parma university in optical communications and networks

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/]

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Research at parma university in optical communications and networks

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

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