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InternationalTelecommunicationUnionGeneva, 19-20 June 2008

Joint ITU-T/IEEE Workshop on Next Generation Optical

Access Systems

Junichi Kani1 and Russell Davey2

1 NTT Access Network Service Systems Labs, NTT2 BT

Requirements for Next Generation PON


Outline

IntroductionEvolution scenario

NG-PON1 and NG-PON2Requirements for NG-PON1

Architecture/infrastructurePower savingOperational functions

Perspective for NG-PON2Summary


PON evolution

Year2000

Bit rate(bps)

ITU-T Recommendation

B-PON

GE-PON

IEEE standard10M

100M

1G

10G

G-PON

10GE-PON

NG-PON

2005 2010

Standardization Deployment

STMPON


Current PON deployment

Typically enabled servicesHigh-speed Internet access (e.g. via Fast Ethernet)TV services

RF video overlay or IP-TV: depends on the business caseTelephony

POTS emulation or VoIP: depends on the business case

Preparedness for future upgradeReuse installed ODN as much as possibleUpgrade individual customers without loss of service to

other customersMinimize manual intervention in ODN

G.984.5 recommends to pre-install Wavelength Blocking Filter (WBF) in G-PON ONU.


WBF in G.984.5

G-PON ONU

Elec.Laser

WBFRecWDM-N

IFPON

G-PON downstreamVideo overlay

Next-gen PON downstream

G.984.5 describes wavelength-blocking characteristics of G-PON ONU assuming to employ WBF

Wavelength (nm)

Tran

smitta

nce

1450 15301480

15001441 1539

0dB-7dB

-22dB(Optional) (Mandatory)


Wavelength bands in G.984.5

1200 1300 1400 1500 1600

Upstream

Enhancement band (EB)Down-

stream Future bandFuture band

1260 1360 1480(nm)

1200 1300 1400 1500 1600

Upstream EB1

1260 1360 1480(nm)

G.983.3

G.984.5

Reduced: 1290-1330 nmNarrow: 1300-1320 nm

Regular: 1260-1360 nm(Informative)

EB21530-1580(or 1625) nm

EB3: 1550-1560 nm

1400-1450 nmDown-stream


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


Evolution scenario

Now ~2010 ~2015

Power splitter deployed for Giga PON(no replacement / no addition)

Splitter for NGA2(power splitter or something new)

G-PON

GE-PON

WDM option to enable to overlay

multiple G/XGPONs

Co-existence

“Co-existence”arrows mean to allow gradual migration in the same ODN.

NG-PON2E.g. Higher-rate TDM

DWDMElect. CDMOFDM,Etc.

Equipment

be common

as much as

possible

NG-PON1 incl. long-reach optionCap

acity

XG-PON(Up: 2.5G to 10G,

Down: 10G)Co-existence

Component R&D to enable NG-PON2


NG-PON1 options

Capacity higher than G-PONUse foreseeable cost-effective technologies

XG-PONDownstream 10GUpstream 2.5 to 10G TBD

Overlay G/XG-PONMultiple G/XG-PON in one fiber via WDM

Options for co-existence with G-PONFull Enhancement-Band (EB) approachPartial EB approachNon-EB approach


Overlay G-PON with full EB approach

GPON OLT

ONU

ONU

ONUONU

ONU

ONUONU ONU

WDM1

1490nm/1310 nm GPON

e.g. 32-way split GPON gives each customer sustained bandwidth 80/40 Mbit/s

Key

ONU

GPON OLT

ONU

GPON OLT

ONU

GPON OLT

ONU

GPON OLT

Overlay GPON (15xx/15yy nm )

e.g. upgrade 4 customers to overlay GPONs giving them 622/155 Mbit/s each

GPON OLT

15xx/15yy nm


Examples of NG-PON1 services

No. Service1 Telephony VoIP2 POTS emulation3 ISDN emulation4 TV (real time) IP-TV

digital TV broadcasting

5 Leased line T1/E16 High speed

Internet accessGbE UNI

7 timing-related services

clock delivery


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


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 mode10G PON LSI is estimated as consuming 4 to 8 times power compared with Giga PON LSI.


Power saving function for XG-PON (example)

ONU OLT

10G mode

Power saving mode

(1G or lower?)• Control• Management

A rapid control channel is required•PLOAM (rapid PON-layer OAM)•Ether OAM•etc.

Transceiver options for ONU•Parallel 1G/10G TRx•Single TRx for 1G/10G


Operational requirements

Keeping ONT conditions under control to comply with SLAOffering an access to UNI to other service providers in some cases

Concepts and approaches for G-PON OMCI should be reused.


Evolution scenario

Now ~2010 ~2015

Power splitter deployed for Giga PON(no replacement / no addition)

Splitter for NGA2(power splitter or something new)

G-PON

GE-PON

WDM option to enable to overlay

multiple G/XGPONs

Co-existence

“Co-existence”arrows mean to allow gradual migration in the same ODN.

NG-PON2E.g. Higher-rate TDM

DWDMElect. CDMOFDM,Etc.

Equipment

be common

as much as

possible

NG-PON1 incl. long-reach optionCap

acity

XG-PON(Up: 2.5G to 10G,

Down: 10G)Co-existence

Component R&D to enable NG-PON2


NG-PON2

Longer-term solution.Significantly higher capacity than GPON, GE-PON

E.g. ~ 1 Gbit/s sustained per customerComponent 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.

InternationalTelecommunicationUnion

NG-PON2

NG-PON1

Technical DirectionB

itrat

e pe

r wav

elen

gth

(Gbp

s)

Number of wavelengths1 2 4 8 16 32

B-PON

G-PONGE-PON

0.1

1

10

Videooverlay

Higher-speed TDMA technologiesincl. long-reach/high-split technologies

-Low-cost optics(direct mod, EDC, FEC…)

-Burst-mode receivers

WDM technologies-Colorless optics(tunable lasers & filters, …)

-Wavelength OA&M

100


Example of architecture: hybrid WDM/TDMA

• Plural TDMA-PONs can be overlaid on an ODN with static wavelength assignment of several wavelengths.

• Colorless ONUs are desirable for this application as well as for simple WDM access.

• Plural TDMA-PONs can be overlaid on an ODN with static wavelength assignment of several wavelengths.

• Colorless ONUs are desirable for this application as well as for simple WDM access.

Access line

Powersplitter

OLT

Terminal cards

IFs

ONU A

ONU D

ONU B

A

time

time A Btime

TDMA

…

B

ONU C

C

time

time

D

C Dtime

…

λ1

λ1

λ2

λ2

2

1

λ1

λ2

Note: illustration for downstream is omitted.


Colorless ONU with wavelength-tunable DWDM-SFP

TFDWDM-SFP

WDM

Tunable ONU

Wavelength-tunableDWDM-SFP

-30

-20

-10

0

10

20

1590 1591 1592 1593 1594 1595

Opt

ical

pow

er [d

Bm]

W avelength [nm ]

50 GHz spacing

CH1 CH83 nm

Opt

ical

Pow

er [d

Bm

]

10-1210-1110-10

10-9

10-8

10-7

10-6

10-5

10-4

-40 -35 -30 50

Loss budget: 36.6 dB

Optical Power [dBm]

BE

R

WDM-OSU IN:-32.1 dBm

Tunable ONU OUT:+4.5 dBm

CH1CH2CH3CH4CH5CH6CH7CH8

Bit rate: 1.25 Gbit/s

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.


European project on NG-PON: MUSE SP E (2006-2007)

Prototype system with real trafficTC-layer implemented

10Gbit/s downstream2.5Gbit/s upstream1:512 splitting ratio100km total reach

30km in ODN

Same color ONTsBurst-mode transponder for 2.5Gbit/s upstream

Contributors: Nokia Siemens Networks, Siemens,British Telecommunications, Telekomunikacja Polska

Bypassing conventional local exchange and centralising the functionality

Hybrid TDM / WDM - PON with higher bitrate, extended split factors and reach


EU FP6 PIEMAN

1525 1530 1535 1540 1545 1550 1555 1560 1565 1570

Upstream Downstream

• 100km reach• Split up to 512• 10 Gbps symmetric• 32 TDM PONs:

• 32 λ Downstream• 32 λ Upstream

Wavelength Plan

ONU=Optical Networking Unit

C-Band• 50 GHz channel spacing• no Video overlay


Summary

NG-PON1 requirementsSmooth migration from gigabit PONs is the essential requirement.Advanced functionalities such as power saving are also important.

NG-PON2 perspectiveTechnical directions include higher-speed TDMA and full WDM.Component R&D should be started now.

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