Progress in Optical Access Standards
Frank EffenbergerRapporteur Q2/15
VP Access R&D, Futurewei
Joint ITU/IEEE Workshop on Ethernet - Emerging Applications and Technologies
(Geneva, Switzerland, 22 September2012)
Agenda – PON Evolution
G-PONNG-PON1 = XG-PONNG-PON2 = TWDM-PONOther topics
2
Capacity Trend for PON
1994TPON
1999A-PONB-PON
2009NG-PON1XG-PON
10GEPON
2014NG-PON2
TWDM-PON
Generation
Bandwidth
0.05G
2.5G
40G
10G
2004G-PONGEPON
0.6G
0.15G
DownstreamUpstream
10G
40G100G
2020+NG-PON3
?
250G
40G
100G 250G
3
G-PON: Widely deployed
System defined in the G.984 seriesG.984.1: System requirementsG.984.2: PMD specificationsG.984.3: TC specificationsG.984.4: OMCI - Subsumed by G.988
Now used for all ITU PONs and P2P systems
G.984.5: WDM matters for the futureG.984.6: Reach extension G.984.7: Long reach Plus supplements…
Standards considered stable and mature Minor optional enhancements continue even now
4
5
XG-PON1 system (G.987 series) coexisting with G-PON
GPONOLTMACLogic
WDM
OLT Tx1490nm
OLT Rx1310nm
NNIDataI/O
GPONONUMACLogic
WDM
ONU Rx1490nm
ONU Tx1310nm
UNIDataI/O
XGPONONUMACLogic
WDM
ONU Rx1577nm
ONU Tx1270nm
UNIDataI/O
GPON OLT GPON ONU
XG-PON ONU
XGPONOLTMACLogic
WDM
OLT Tx1577nm
OLT Rx1270nm
NNIDataI/O
XG-PON OLT WDM1
1490nm
1577nm
1310nm
1270nm
6
XG-PON1 PMD specifications: G.987.2
Six OLT types and two ONU typesFour loss budgets in all
N1 OLT Tx: +2 ~ +6
Rx: -7 ~ -27.5
N2a OLTTx: +4 ~ +8
Rx: -9 ~ -29.5
N2b OLT Tx: +10.5 ~ +12.5
Rx: -9 ~ -29.5
E1 OLT Tx: +6 ~ +10
Rx: -11 ~ -31.5
E2a OLT Tx: +8 ~ +12
Rx: -11 ~ -31.5
E2b OLT Tx: +14.5 ~ +16.5
Rx: -13 ~ -33.5
PIN ONU Tx: +2 ~ +7
Rx: -3.5 ~ -22.5
APD ONU Tx: +2 ~ +7Rx: -8 ~ -28
29dB 31dB 33dB 35dB31dB35dB
7
XG-PON TC layer structure :G.987.3
The XG-PON TC layer is broken into 3 layers
Simplified implementation Improved extensibility
PHY adaptation SublayerPHY adaptation Sublayer
Framing SublayerFraming Sublayer
Service adaptation SublayerService adaptation Sublayer
Implements essential TDMAControl and signaling
Encapsulates frame andInterfaces with PHY layer
Encapsulated users dataInterfaces with Framing layer
First XG-PON trial in the world
World’s First XG-PON Trial
Shweta Jain1, Frank Effenberger2, Andrea Szabo3, Zhishan Feng2, Albert Forcucci1, Wei Guo2, Yuanqiu Luo2, Robert Mapes2, Yixin Zhang2,, Vincent
O’Byrne1
1 Verizon, 117 West Street, Waltham, MA, 024512 Huawei Technologies, 2330 Central Expressway, Santa Clara, CA 95050
3 Verizon, 13100 Columbia Pike, D-35A, Silver Spring, MD 20904
March 2010
8
NG-PON2: Technology Map
Bit Rate
Nu
mb
er
of
Wavele
ngth
s
TWDMPON
A-PON
B-PON
G-PON
XG-PON
XLG-PON1
4
16
64
155M 622M 2.5G 10G
DWDMPON
OFDMPON
40G
UDWDMPON
1
2 3
4
9
1. XLG-PON 40G/10G TDM PON
OLT ONU
1:N
40G DS
BM APD RxEDC
10G APD BMR• re-use 10G EPON PR-30• Add BM EDC to gain 2 dB
EML SOA
40G integrated EML + SOA
• Integration driven by XG-PON N2b
• 40G duobinary modulation (electrical)
• +10 dBm output
APD Rx
Bit-interleaving protocol• Dynamic bandwidth• User-rate ONU
electronics
20 GHz APD Rx• Duobinary demodulation
(electrical)• Efficient FEC (e.g.
LDPC)• -22 dBm sensitivity
Log
ic
Log
ic10G US
40 km reach40 km diff. distance31 dB loss budget
10
11
2. WDM mux-based WDM PONs:Passive Photonic Loop
ONU1
ONU2
ONU3
Xcvr1Xcvr2
Xcvr3
WDMMUX
WDMMUX
Colorless ONU type 1 • ONU receives only one downstream wavelength • ONU must transmit on the correct upstream wavelength
2A-C. Wavelength Injection types
ONU
IL FP
Rx
Log
ic
OLT
Rx
DFB Tx
Log
ic
ASESeed
Tx/Rx
Tx/Rx
AW
G
ONU
RSOA
Rx
Log
ic
AW
G
1535 1560
ASE light
1535 1560
ASE slice
1535 1560
After locking
1535 1560
Before locking
Reflective
Gainzone
1535 1560
ASE slice in
1535 1560
Amplified light out
RSOA
2A. External Injection
ONU
RSOA
Rx Log
ic
OLT
Rx
DFB TxLog
ic
Tx/Rx
Tx/Rx
AW
G AW
G
PowerSplitter
EYE Distortion
Reflective
Gainzone
1535 1560
Rx λ in
1535 1560
Amplified λ out
RSOA0 0 01 1 1
Rx data modulation
2B. Wavelength Reuse
ONU
IL FP
Rx Log
ic
OLT
Rx
RSOALog
ic
Tx/Rx
Tx/Rx
AW
G
ONU
RSOA
Rx Log
ic
AW
G
1535 1560
After locking
1535 1560
Before locking
Reflective
Gainzone
RSOA
1535 1560
ASE slice in
1535 1560
Amplified light out
1535 1560
ASE light
FRM FRM
2C. Self Seeded
12
13
2. Splitter-based WDM PONs: Lambda Net
ONU1
ONU2
ONU3
Xcvr1Xcvr2
Xcvr3
WDMMUX
Splitter
Colorless ONU type 2 • ONU must tune to the correct downstream wavelength • ONU must transmit on the correct upstream wavelength
2D-E. Tunable ONUs
OLT
Rx
DFB TxLog
ic
Tx/Rx
Tx/Rx
AW
G
ONU
Rx Log
ic
Laser
1:N
OLT
Pol. Div.Coherent Rx
ModulatorTx
Tx/Rx
Tx/RxA
WG
Freq Gen
Log
ic
Loc Osc
ONU
Log
ic
Pol. Div.Coherent Rx
ModulatorTx
DSP
Con
trol
LocOsc1
:N
2D. Conventional tuned lasers and filters
2E. Coherent receiver and modulator
14
3. [[O-]O]FDM PON
Lin.
Tx
Lin.
Rx
OLT
10G MAC
Lin. Rx
Lin. Tx
Medium BW ONU
40G MAC
2.5G MAC
Mo-dem
Mo-dem
Mo-dem
10G MAC
Mo-dem
Lin. Rx
Lin. Tx
High BW ONU
2.5G MAC
Mo-dem
Lin. Rx
Lin. Tx
Low BW ONU
2.5G MAC
Mo-dem
RF Frequency
Pow
er
Lin.
Tx
Lin.
Rx
OLT
Bit load
MAC
ONU
IFFT
DAC
Bit un
load
FFT
ADC
Lin.
Tx
Lin.
Rx
Bit load
MAC
IFFT
DAC
Bit un
load
FFT
ADCRF Frequency
Pow
er
LO
BalRx
OLT
MAC+
Serdes
ONU
IFFT
DAC
FFT
ADC
MAC+
serdes
IFFT
DAC
FFT
ADC
FFT
ADC
IFFT
DAC
BalRx
Mod
Pol
FFT
ADC
IFFT
DAC
BalRxBalRx
Pol
LO
Mod
3A. FDM-PON
3B. OFDM-PON
3C. O-OFDM-PON
15
4. TWDM PON (XG-PON2)
XG-PON2 OLT
BM Rx 1
Tx λ1
Log
ic
XGPON2 ONU 1.1
Log
ic
Laser
Rx
AW
GA
WGTx λ2
Tx λ8
…
BM Rx 2
BM Rx 8
…
GPON OLT
WD
M1
RF Overlay
GPON ONU
1:N XGPON2 ONU 2.1
Log
ic
Laser
Rx
XGPON2 ONU 8.1
Log
ic
Laser
Rx
Key Features:• Builds on XG-PON1• Uses splitter based PON• Advantages
Reasonable costs
Up to 80 Gbps
Coexists with deployed GPON
• Advantages
Reasonable costs
Up to 80 Gbps
Coexists with deployed GPON
• Challenges
− Tunable Receivers and Transmitters at ONU
− Spectrum allocation
• Challenges
− Tunable Receivers and Transmitters at ONU
− Spectrum allocation
16
NG-PON2 architecture scorecard
40G SerialALU
TWDMALU, BL, CX,
HW, MIT, OKI, PMC, ZTE
SS-WPONALU, HW
UD-WPONNSN
IL-WPONLG-E, ETRI
RU-WPONERIC
Tun-WPONADVA
[WDM]-[O]-OFDM-PON
NEC
[O]-OFDM-PONALU
OFDM-PONFuji, ITRI, Hisense,
NeoP, Vit, ZTE
Green = Selected!Yellow = Optional enhancementRed means not this time
17
Approved TWDM system requirements
Base system: 40G downstream, 10G upstream4 channels in each directionCompatible with G-PON, XG-PON, and RF video overlay20km @ 1:64 split ratio fully passive plant capable
Optional extra capabilities8 channels in each direction 10G upstream DWDM overlay
Standardization is expected to complete July 2013
18
NG-PON2 spectrum(rough consensus)
1260 1270 1280 1290 1300 1310 1320 1330 1340 1350 1360
1480 1490 1500 1510 1520 1530 1540 1550 1560 1570 1580 1590 1600 1610
G-PONupstream
XG-PONupstream
G-PONdownstream
XG
Video
10nm
1600 1601 1602 1603 1604 1605 1606
NG2
NG2
NG2
NG2
NG2
NG2
NG2
NG2
NG2
NG2
1530 1531 1532 1533 1534 1535 1536
NG2
NG2
NG2
NG2
NG2
NG2
NG2
NG2
19
TWDM standards arrangement
G.ngpon2.1 = RequirementsConsented at Sep 2012 meeting
G.ngpon2.2 = Physical medium dependent layerDraft in progress
G.ngpon2.3 = TC layerNG-PON2 specific TC features
G.987.3 = Transmission convergence layer10G upstream to be added to this base standard
G.multi = Wavelength control layerDraft already started in Q2/15
G.988 = ONU management and control interfaceStandard in force, can be easily reused for TWDM
20
Other topics
G.eponApplies OMCI (G.988) to EPONRelevant to P1904.1 Package B systems
G.multiDescribes generic multi-wavelength control in PON access systems
G.pocStudy of integrated PON-G.fast systemsObjective of reducing DP complexity
21
Thank you
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