reach extension of passive optical networks using semiconductor optical amplifiers
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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Reach extension of passive optical networks using semiconductor optical
amplifiersA E Kelly, C. Michie, I. Andonovic, J. McGeough, S
Kariaganopoulos
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Standard Passive Optical Networks
GPON 1:32Reach 10-20km
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Extended Reach Passive Optical Networks
Electronic regeneration cannot be used as it results in Preamble erosion due to burst mode locking time
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Passive Optical Networks 1300nm backhaul
transmitter 1310nm
VOA1 SOA VOA2
20 nmfilter
receiver 1310nm
•VOA1 represents access loss – split plus some link loss•VOA2 predominately trunk loss•1300 nm and 1.25/2.5 Gbit/s; dispersion neglected
insertion loss α
Significant ASE levels
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Power BudgetSimple linear model
2
22
tot
inPRSNR
PinPIN or APD
.)(4)(2
22
2
2
BFRkTBIRPe
PRISNRN
LDrec
in
TOT
P
shot noise terms thermal noise
receiver Noise Figure
pin
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Power BudgetSimple linear model 2
22
tot
inPRSNR
PinPIN or APD
shot noise termsthermal noise
receiver Noise Figure
APD
BFRkTBIRPFeM
PRMISNRN
LDinA
in
TOT
P
)(4)(2 2
222
2
2
APD Multiplication and Noise Factor
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SNR modified to account for ER of transmitter – at best 10 dB
Power Budget
e
eAVE
rrP
Q11
20
21
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Baseline calculations
APDNeo PhotonicsPTB3J88-5638T-SC/PC+
pin – OCP- TRXAG1M
data modelled for commercial pin/APD
1.E-11
1.E-10
1.E-09
1.E-08
1.E-07
1.E-06
1.E-05
-30.00 -28.00 -26.00 -24.00 -22.00 -20.00
Receiver Power, dBm
BE
R
BTB10dB ER
1.E-11
1.E-10
1.E-09
1.E-08
1.E-07
1.E-06-36.00 -34.00 -32.00 -30.00 -28.00 -26.00
Receiver Power, dBm
BE
R
BTBBTB ER 10 dB
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Inclusion of AmplifierBuild upon a model of the SNR to include the noise terms
associated with amplifier
2222221 ASEASEASESASEST
22220 ASEASEASET
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Extinction Ratio further degraded due to ASE
ASEASE PPP /)( 1
11
20
21
AVEPQ
transmitter 1310nm
VOA1 SOA VOA2
20 nmfilter
receiver 1310nm
insertion loss α
Significant ASE levels
0v
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APD based ReceiverAssumptions
– -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
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Amplified APD Receiver
1.E-13
1.E-12
1.E-11
1.E-10
1.E-09
1.E-08
1.E-07
1.E-06
1.E-05
1.E-04
1.E-03
-45.00 -40.00 -35.00 -30.00 -25.00
Signal Power, dBm
BE
R
BTB infinite ERBTB 10 dB ER0.8 nm filter10 nm filter20 nm filter20 nm no ER deg
Baseline0.8nm filter10 nm filter20 nm filter
20 nm filterER not considered
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Influence of Optical Filtering
-40.00
-39.00
-38.00
-37.00
-36.00
-35.00
-34.00
-33.00
-32.00
-31.00
-30.00
0 5 10 15 20
Optical Filter Bandwidth, nm
Rec
eive
r Pow
er, d
Bm
( B
ER
10e-
10)
0
1
2
3
4
5
6
7
8
9
10
Ext
inct
ion
Rat
io, d
B
Prec pinPrec APDpin ext dBAPD ext dB
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Post Amplifier Losses
Position amplifier to compensate for splitting and reach lossesSOA Psat limited to +13 dBmGain adjusted accordingly max
max
1GGP
GG
in
Splitter(Access)
lossSOA Backhaul
20 nmfilter
OLTreceiver 1310nm
insertion loss αONT
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System Power Margins
0
5
10
15
20
25
30
35
40
0 5 10 15 20 25 30 35Loss into Amplifier, dB
Loss
afte
r am
plifi
er, d
B
0
1
2
3
4
5
6
7
8
9
10
Extin
ctio
n R
atio
, Pow
er p
enal
ty, d
B
Post Amplifier LossUnamplified SignalPpenaltyext dB
pre-amp margin
booster margin
mid span margin benefit
GPON
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Margin Enhancement for Amplified GPON
0
5
10
15
20
25
30
0 5 10 15 20 25 30 35 40
Loss into Amplifier, dB
Sys
tem
Mar
gin
Enh
ance
men
t, dB
128 split
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-20
0
20
40
60
80
100
1 10 100 1000 10000
SplitRatio
Bac
khau
l Dis
tanc
e, k
m
Amplified ReachUnamplified Signal
64 split128 split
32 Split64 Split512 Split
Psat limitedGain limited
NF limitedGPON: 32 split
Distance versus number of users for each case
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Experiment
VOA SOA VOAl
Channel DropOSA
(filter)
1300 nmreceiver
1300 tx
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Experimental Validation
1.E-10
1.E-09
1.E-08
1.E-07
1.E-06
1.E-05
-40.00 -38.00 -36.00 -34.00 -32.00 -30.00 -28.00 -26.00
Signal Power, dBm
BE
R
BTB Theory10 nm theory20 nm theory20nmBTB10 nm
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Constant BER curve with filter width
-40
-39
-38
-37
-36
-35
-34
-33
-32
-31
-30
0 5 10 15 20
Optical Filter Bandwidth, nm
Rec
eive
r Pow
er, d
Bm
( B
ER
10e-
10)
0
1
2
3
4
5
6
7
8
9
Ext
inct
ion
Rat
io, d
B
Prec APD
Sens
APD ext dB
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Experimental Margin Enhancement
-30
-20
-10
0
10
20
30
40
50
60
0 5 10 15 20 25 30 35
Loss into Amplifier, dB
Pos
t Am
plifi
er M
argi
n, d
B
-35
-30
-25
-20
-15
-10
-5
0
Pow
er a
t Rec
eive
r, dB
m
Loss Post Amp TheoryLoss Post Amp ExptUnamplifiedP BER10-9 EXPTP 10-9 theory
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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 PublicationsRussell P. Davey, Daniel B. Grossman, Michael Rasztovits-Wiech, David B. Payne, Derek Nesset, A. E. Kelly, Albert Rafel, Shamil Appathurai, 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.