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