Reach extension of passive optical networks using semiconductor optical amplifiers A E Kelly, C. Michie, I. Andonovic, J. McGeough, S Kariaganopoulos
Feb 14, 2016
Reach extension of passive optical networks using semiconductor optical
amplifiersA E Kelly, C. Michie, I. Andonovic, J. McGeough, S
Kariaganopoulos
Standard Passive Optical Networks
GPON 1:32Reach 10-20km
Extended Reach Passive Optical Networks
Electronic regeneration cannot be used as it results in Preamble erosion due to burst mode locking time
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
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
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
SNR modified to account for ER of transmitter – at best 10 dB
Power Budget
e
eAVE
rrP
Q11
20
21
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
Inclusion of AmplifierBuild upon a model of the SNR to include the noise terms
associated with amplifier
2222221 ASEASEASESASEST
22220 ASEASEASET
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
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
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
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
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
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
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
-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
Experiment
VOA SOA VOAl
Channel DropOSA
(filter)
1300 nmreceiver
1300 tx
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
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
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
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.