Joint ITU-T/IEEE Workshop on
Next Generation Optical
Access Systems
Requirements for Next
Generation PON
1
Junichi Kani1 and Russell Davey2
NTT Access Network Service Systems Labs, NTT
2 BT
Geneva, 19-20 June 2008
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Outline
Introduction
Evolution scenario
NG-PON1 and NG-PON2
Requirements for NG-PON1
Architecture/infrastructure
Power saving
Operational functions
Perspective for NG-PON2
Summary
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PON evolution
Bit rate
(bps)
NG-PON
10G
10GE-PON
G-PON
GE-PON
1G
B-PON
100M
10M
Standardization
Deployment
ITU-T Recommendation
STM
PON
IEEE standard
2000
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2005
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2010
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Current PON deployment
Typically enabled services
High-speed Internet access (e.g. via Fast Ethernet)
TV services
RF video overlay or IP-TV: depends on the business case
Telephony
POTS emulation or VoIP: depends on the business case
Preparedness for future upgrade
Reuse installed ODN as much as possible
Upgrade individual customers without loss of service to
other customers
Minimize manual intervention in ODN
G.984.5 recommends to pre-install Wavelength
Blocking Filter (WBF) in G-PON ONU.
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WBF in G.984.5
G-PON ONU
IFPON
Laser
Elec.
Rec
WBF
WDM-N
G-PON downstream
Video overlay
Next-gen PON downstream
Transmittance
G.984.5 describes wavelength-blocking characteristics of GPON ONU assuming to employ WBF
0dB
-7dB
(Optional)
(Mandatory)
-22dB
1441
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1450
1480
1530
1500
1539
Wavelength (nm)
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Wavelength bands in G.984.5
G.983.3
1200
1260
Upstream
1300
1360
G.984.5
Upstream
Regular: 1260-1360 nm
Reduced: 1290-1330 nm
Narrow: 1300-1320 nm
1360
1260 1300
1200
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Future band
1400
Enhancement
band (EB)
DownFuture band
stream
1480
1500
1600 (nm)
EB2
EB1
(Informative) Down- 1530-1580(or 1625) nm
EB3:
1400-1450 nm stream
1550-1560 nm
1400
1480
1500
1600 (nm)
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Expectations for NG-PON
Broader bandwidth for enabling
new services
Smooth migration from the
present PONs
Advanced functionalities for issues
extracted from the massive PON
deployment
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Evolution scenario
Capacity
Component R&D to enable NG-PON2
“Co-existence”
arrows mean to
allow gradual
migration in the
same ODN.
G-PON
-e
Co
o-e
GE-PON C
nce
e
t
xis
ce
ten
s
i
x
NG-PON1 incl.
long-reach option
WDM option to
NG-PON2
E.g. Higher-rate TDM
DWDM
Elect. CDM
OFDM,Etc.
t
m en n
p
i
u
Eq mmo
o
be c uch as
as m sible
p os
enable to overlay
multiple G/XGPONs
XG-PON
(Up: 2.5G to 10G,
Down: 10G)
Splitter for NGA2
(power splitter or
something new)
Power splitter deployed for Giga PON
(no replacement / no addition)
Now
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~2010
~2015
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NG-PON1 options
Capacity higher than G-PON
Use foreseeable cost-effective technologies
XG-PON
Downstream 10G
Upstream 2.5 to 10G TBD
Overlay G/XG-PON
Multiple G/XG-PON in one fiber via WDM
Options for co-existence with G-PON
Full Enhancement-Band (EB) approach
Partial EB approach
Non-EB approach
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Overlay G-PON with full EB
approach
ONU
ONU
GPON
OLT
ONU
15xx/15yy nm
WDM1
ONU
ONU
ONU
ONU
GPON
OLT
e.g. 32-way split GPON gives each
customer sustained bandwidth
80/40 Mbit/s
ONU
Key
ONU
e.g. upgrade 4 customers to
overlay GPONs giving them 622/155
Mbit/s each
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GPON
OLT
1490nm/1310 nm
GPON
ONU
GPON
OLT
Overlay GPON
(15xx/15yy nm )
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Examples of NG-PON1 services
No.
1
2
3
4
Service
Telephony
5
6
Leased line
High speed
Internet access
timing-related
services
7
TV (real time)
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VoIP
POTS emulation
ISDN emulation
IP-TV
digital TV
broadcasting
T1/E1
GbE UNI
clock delivery
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NG-PON1 general requirements
on architecture/infrastracture
Common system for FTTH, FTTBulding,
FTTCabinet/Curb, etc.
Common system for single-stage and
multi-stage splitter ODNs.
Class C as baseline and Class C++ as
amplified option for ODN budget
Protection option that does not impact
the fixed cost of unprotected PON
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Power saving
As for the XG-PON, it is mandatory to
employ enhanced energy efficient function
in its TC and above layer(s).
Lifeline service with minimum power
consumption
e.g. 4 to 8 hour sustainability with battery
10G as the turbo mode
10G PON LSI is estimated as consuming 4 to 8
times power compared with Giga PON LSI.
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Power saving function for XGPON (example)
ONU
Power saving
mode
(1G or lower?)
10G mode
OLT
• Control
• Management
A rapid control channel is required
•PLOAM (rapid PON-layer OAM)
•Ether OAM
•etc.
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Transceiver options for ONU
•Parallel 1G/10G TRx
•Single TRx for 1G/10G
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Operational requirements
Keeping ONT conditions under
control to comply with SLA
Offering an access to UNI to other
service providers in some cases
Concepts and approaches for GPON OMCI should be reused.
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Evolution scenario
Capacity
Component R&D to enable NG-PON2
“Co-existence”
arrows mean to
allow gradual
migration in the
same ODN.
G-PON
-e
Co
o-e
GE-PON C
nce
e
t
xis
ce
ten
s
i
x
NG-PON1 incl.
long-reach option
WDM option to
NG-PON2
E.g. Higher-rate TDM
DWDM
Elect. CDM
OFDM,Etc.
t
m en n
p
i
u
Eq mmo
o
be c uch as
as m sible
p os
enable to overlay
multiple G/XGPONs
XG-PON
(Up: 2.5G to 10G,
Down: 10G)
Splitter for NGA2
(power splitter or
something new)
Power splitter deployed for Giga PON
(no replacement / no addition)
Now
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~2010
~2015
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NG-PON2
Longer-term solution.
Significantly higher capacity than GPON, GEPON
E.g. ~ 1 Gbit/s sustained per customer
Component R&D needs to start now
E.g. tunable transmitters and receivers etc.
Cost reduction
Co-existence requirement could be relaxed as
long as cost-effective upgrade strategy from
earlier generations is identified.
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Bitrate per wavelength (Gbps)
Technical Direction
Higher-speed TDMA technologies
incl. long-reach/high-split technologies
100
-Low-cost optics
(direct mod, EDC, FEC…)
-Burst-mode receivers
10
NG-PON1
G-PON
GE-PON
1
B-PON
0.1
1
2
Video
overlay
4
NG-PON2
WDM technologies
-Colorless optics
(tunable lasers & filters, …)
-Wavelength OA&M
8
16
Number of wavelengths
32
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Example of architecture:
hybrid WDM/TDMA
••Plural
PluralTDMA-PONs
TDMA-PONscan
canbe
beoverlaid
overlaidon
onan
anODN
ODNwith
withstatic
staticwavelength
wavelength
assignment
assignmentof
ofseveral
severalwavelengths.
wavelengths.
••Colorless
ONUs
are
desirable
Colorless ONUs are desirablefor
forthis
thisapplication
applicationas
aswell
wellas
asfor
forsimple
simple
WDM
WDMaccess.
access.
A
ONU A
λ1
B
ONU B
λ1
A B…
λ2
C D…
time
time
Access line
Power
splitter
D
ONU D
time
λ1
time
λ2
λ2
time
OLT
1
C
ONU C
TDMA
IFs
2
Terminal
cards
time
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Note: illustration for downstream is omitted.
Wavelength-tunable
DWDM-SFP
OpticalPower
power [dBm]
Optical
[dBm]
Colorless ONU with wavelengthtunable DWDM-SFP
20
3 nm
10
CH1
0
CH8
50 GHz
spacing
-10
-20
Tunable ONU
W
DWDM
D
-SFP TF M
-30
1590
1591
1592
1593
W avelength [nm ]
1594
1595
-4
10
Bit rate: 1.25 Gbit/s
-5
10
Loss budget: 36.6 dB
-6
H. Suzuki, et al, “Wavelength-Tunable
DWDM-SFP Transceiver with a Signal
Monitoring Interface and Its Application to
Coexistence-Type Colorless WDM-PON,”
ECOC 2007, PD-3.4.
BER
10
-7
10
-8
10
-9
10
-10
10
-11
10
-12
10
-40
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH8
-35
Tunable ONU OUT:
+4.5 dBm
WDM-OSU IN:
-32.1 dBm
-30
Optical Power [dBm]
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European project on NG-PON:
MUSE SP E (2006-2007)
Hybrid TDM / WDM - PON with higher bitrate, extended split factors and reach
Bypassing conventional local exchange and centralising the
functionality
Contributors: Nokia Siemens Networks, Siemens,
British Telecommunications, Telekomunikacja Polska
Prototype system with real traffic
TC-layer implemented
10Gbit/s downstream
2.5Gbit/s upstream
1:512 splitting ratio
100km total reach
30km in ODN
Same color ONTs
Burst-mode transponder for 2.5Gbit/s
upstream
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EU FP6 PIEMAN
• 100km reach
• Split up to 512
• 10 Gbps symmetric
• 32 TDM PONs:
• 32 λ Downstream
• 32 λ Upstream
ONU=Optical Networking Unit
Wavelength Plan
1525
1530
1535
C-Band
• 50 GHz channel spacing
• no Video overlay
Downstream
Upstream
1540
1545
1550
1555
1560
1565
1570
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Summary
NG-PON1 requirements
Smooth migration from gigabit PONs
is the essential requirement.
Advanced functionalities such as
power saving are also important.
NG-PON2 perspective
Technical directions include higherspeed TDMA and full WDM.
Component R&D should be started
now.
Geneva, 19-20 June 2008
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