Università di Parma - Ingegneria delle Telecomunicazioni

Università di Parma
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]
Gain Dynamics in Optical Amplifiers
 WDM Long-Haul Design

Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 1/30
Università di Parma
Gain Dynamics
in
Optical Amplifiers
( Collaboration with Laval University, Québec, Canada )
Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 2/30
Università di Parma
Pisa, Nov. 29, 2005
Scenario
A. Bononi, 2nd Korea-Italy S&T Forum 3/30
Università di Parma
Pisa, Nov. 29, 2005
Saturation-induced
Gain Dynamics
A. Bononi, 2nd Korea-Italy S&T Forum 4/30
Erbium Doped Fiber Amplifiers
Università di Parma

N
Y. Sun et al. JSAQE Aug 97
Gain
A. Bononi et al. JLT May 98
r
Bk r  Ak
in
Qk (1  e
)
r    
k 0
r = number of excited ions in EDFA
x = r/rmax average inversion
 = fluorescence time (10 ms)
Q = signal and pump fluxes [photons/sec]
x
Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 5/30
Università di Parma
S. Novak et al. JLT June 02
Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 6/30
Università di Parma
Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 7/30
Università di Parma
x
Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 8/30
Gain Clamping
Università di Parma
Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 9/30
Gain Clamping
Università di Parma
A. Bononi et al. JLT July 99
Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 10/30
Università di Parma
M. Karasek et al. JLT March 00
Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 11/30
Università di Parma
M. Karasek et al. JLT March 00
Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 12/30
Raman Amplifiers
Università di Parma
A. Bononi et al. OFC 02
Pump depletion %
Pump
attenuation
p
2d
Pisa, Nov. 29, 2005
Walk-off
A. Bononi, 2nd Korea-Italy S&T Forum 13/30
Raman Amplifiers
Università di Parma
A. Bononi et al. OFC 03
Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 14/30
Ultra-wide bandwidth Raman
Università di Parma
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!
Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 15/30
Semiconductor Optical Amplifiers
Università di Parma
G. P. Agrawal et al. JQE Nov 89
Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 16/30
Gain Clamping
Università di Parma
GC-SOA
Soulage et al., Alcatel, 1994
LOA
Francis et al., Genoa, 2001
Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 17/30
Università di Parma
Pisa, Nov. 29, 2005
2003 MIUR Project Wonder
A. Bononi, 2nd Korea-Italy S&T Forum 18/30
Università di Parma
WDM
Long-Haul
Design
( Collaboration with Alcatel, Marcoussis, France )
Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 19/30
Università di Parma
Pisa, Nov. 29, 2005
Scenario
A. Bononi, 2nd Korea-Italy S&T Forum 20/30
DM long-haul Terrestrial Link
Università di Parma
RX
OF
Bo
zA
EF
Be
N
D
A
Dispersion
Map
Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 21/30
Università di Parma
Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 22/30
OOK-NRZ Signal
Università di Parma
P(t)
P(t)
P
1 0 1 1 0
t
t
Im[E]
Im[E]
0
0
1
Re[E]
Re[E]
1
F
Nonlinear
phase
Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 23/30
Università di Parma
Rx Field
Im[E]
Re[E]
quadrature
ASE
In-phase
ASE
Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 24/30
ASE Spectrum
Normalized PSD [dB]
Università di Parma
P(t)
8
4
Si(f)
0
Parametric
Gain
Sr(f)
-4
frequency f
P
PSD [dB]
t
Si(f)
N0
Sr(f)
frequency f
Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 25/30
Università di Parma
Linear PG Model
No pre-, post-comp.
Red : quadrature ASE
»
Blue: in-phase ASE
Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 26/30
Impact on BER
Università di Parma
Decision
Threshold
(in optical
domain)
Im[E]
Re[E]
Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 27/30
Università di Parma
Failure of Linear PG Model
avg F=0.55 rad/, 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 per frame )
What happens at smaller OSNRs?
Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 28/30
Consequences on systems with FEC
Università di Parma
10 Gb/s single-channel NRZ system, 20100 km, D=8 ps/nm/km, Din=0.
14
Noiseless optimized Dpre, Dpost
end-line OSNR=11 dB/0.1nm
Standard analysis
with FEC
Uncoded
log(BER)
Q Factor [dB]
12
10
8
true value
CG
6
0
Pisa, Nov. 29, 2005
0.2
0.4
0.6
0.8
Nonlinear phase [rad/]
1
Q factor [dB]
A. Bononi, 2nd Korea-Italy S&T Forum 29/30
Università di Parma
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
Pisa, Nov. 29, 2005
A. Bononi, 2nd Korea-Italy S&T Forum 30/30