Joint ITU-T/IEEE Workshop on Next Generation Optical Access Systems. Requirements for Next Generation PON

Transcription

1 Joint ITU-T/IEEE Workshop on Next Generation Optical Access Systems Requirements for Next Generation PON Junichi Kani 1 and Russell Davey 2 1 NTT Access Network Service Systems Labs, NTT 2 BT

2 Outline Introduction Evolution scenario NG-PON1 and NG-PON2 Requirements for NG-PON1 Architecture/infrastructure Power saving Operational functions Perspective for NG-PON2 Summary

3 PON evolution Bit rate (bps) 10G 10GE-PON NG-PON 1G GE-PON G-PON 100M B-PON Standardization Deployment 10M STM PON ITU-T Recommendation IEEE standard Year

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

5 WBF in G G-PON ONU IF PON Elec. Laser Rec WBF WDM-N G-PON downstream Video overlay Next-gen PON downstream G describes wavelength-blocking characteristics of G- PON ONU assuming to employ WBF Transmittance 0dB -7dB -22dB (Optional) (Mandatory) Wavelength (nm)

6 Wavelength bands in G G Upstream Future band Downstream Enhancement band (EB) Future band (nm) G Upstream Regular: nm Reduced: nm Narrow: nm EB1 (Informative) nm Downstream EB (or 1625) nm EB3: nm (nm)

7 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

8 Capacity Co-existence arrows mean to allow gradual migration in the same ODN. G-PON GE-PON Evolution scenario Component R&D to enable NG-PON2 Co-existence Co-existence NG-PON1 incl. long-reach option WDM option to enable to overlay multiple G/XGPONs XG-PON (Up: 2.5G to 10G, Down: 10G) Power splitter deployed for Giga PON (no replacement / no addition) Equipment be common as much as possible Splitter for NGA2 (power splitter or something new) Now ~2010 ~2015 NG-PON2 E.g. Higher-rate TDM DWDM Elect. CDM OFDM,Etc.

9 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

10 Overlay G-PON with full EB approach ONU ONU ONU GPON OLT ONU 15xx/15yy nm WDM1 GPON OLT ONU ONU ONU e.g. 32-way split GPON gives each customer sustained bandwidth 80/40 Mbit/s ONU Key e.g. upgrade 4 customers to overlay GPONs giving them 622/155 Mbit/s each ONU GPON OLT ONU GPON OLT 1490nm/1310 nm GPON Overlay GPON (15xx/15yy nm )

11 Examples of NG-PON1 services No. Service 1 Telephony VoIP 2 POTS emulation 3 ISDN emulation 4 TV (real time) IP-TV digital TV broadcasting 5 Leased line T1/E1 6 High speed GbE UNI Internet access 7 timing-related services clock delivery

12 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

13 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.

14 Power saving function for XG- PON (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. Transceiver options for ONU Parallel 1G/10G TRx Single TRx for 1G/10G

15 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 G- PON OMCI should be reused.

16 Capacity Co-existence arrows mean to allow gradual migration in the same ODN. G-PON GE-PON Evolution scenario Component R&D to enable NG-PON2 Co-existence Co-existence NG-PON1 incl. long-reach option WDM option to enable to overlay multiple G/XGPONs XG-PON (Up: 2.5G to 10G, Down: 10G) Power splitter deployed for Giga PON (no replacement / no addition) Equipment be common as much as possible Splitter for NGA2 (power splitter or something new) Now ~2010 ~2015 NG-PON2 E.g. Higher-rate TDM DWDM Elect. CDM OFDM,Etc.

17 NG-PON2 Longer-term solution. Significantly higher capacity than GPON, GE- PON 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.

18 Technical Direction Bitrate per wavelength (Gbps) Higher-speed TDMA technologies incl. long-reach/high-split technologies -Low-cost optics (direct mod, EDC, FEC ) -Burst-mode receivers G-PON GE-PON B-PON NG-PON1 Video overlay NG-PON2 WDM technologies -Colorless optics (tunable lasers & filters, ) -Wavelength OA&M Number of wavelengths

19 Example of architecture: hybrid WDM/TDMA Plural Plural TDMA-PONs can can be be overlaid on on an an ODN ODN with with static static wavelength assignment of of several wavelengths. Colorless ONUs ONUs are are desirable for for this this application as as well well as as for forsimple WDM WDM access. A TDMA time λ 1 λ 1 A B ONU A time B λ 2 C D OLT time time λ 1 ONU B 1 C IFs Access line time 2 λ 2 Power Terminal ONU C splitter cards D time ONU D λ 2 Note: illustration for downstream is omitted.

20 Colorless ONU with wavelengthtunable DWDM-SFP Wavelength-tunable DWDM-SFP Tunable ONU DWDM W DM -SFP TF Optical Power power [dbm] GHz spacing CH1 3 nm CH Wavelength [nm] Bit rate: 1.25 Gbit/s Loss budget: 36.6 db 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 CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8 Tunable ONU OUT: +4.5 dbm WDM-OSU IN: dbm Optical Power [dbm]

21 European project on NG-PON: MUSE SP E ( ) 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 s, 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

22 EU FP6 PIEMAN 100km reach Split up to Gbps symmetric 32 TDM PONs: 32 λ Downstream 32 λ Upstream ONU=Optical Networking Unit Wavelength Plan Upstream Downstream C-Band 50 GHz channel spacing no Video overlay

23 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.