Smooth migration Technology from GE-PON to NG-PON towards NGN era in Japan

Transcription

1 Smooth migration Technology from GE-PON to NG-PON towards NGN era in Japan 3 June, 2009 Naoto Yoshimoto Access Network Service Systems Labs. NTT Corporation yosimoto@ansl.ntt.co.jp 1

2 Outline 1. Current NTT s FTTH Services 2. Key Technologies of GE-PON on NGN 3. Requirements of NG-PON systems 4. Standardization activity of 10G-EPON 5. R&D activity of 1G/10G dual-rate EPON 6. Summary 2

3 1. Current NTT s FTTH Services 2. Key Technologies of GE-PON on NGN 3. Requirements of NG-PON systems 4. Standardization activity of 10G-EPON 5. R&D activity of 1G/10G dual-rate EPON 6. Summary 3

4 History of PON Systems and FTTH Services in Japan - NTT is is Pioneer of of PON systems and FTTH service - Transmission capacity has rapidly increased - Telephone service to to Internet access Service 1 st stage NGN 1G GE-PON B-PON 100M 10M FTTH trial STM-PON (Internet Access Service) STM-PON (Telephone Service System) SCM-PON, STM-PON (CATV Video Transmission System) STM-PON: Synchronous Transfer Mode Passive Optical Network B-PON: Broadband Passive Optical Network GE-PON: Gigabit Ethernet Passive Optical Network SCM-PON: Subcarrier Multiplexing Passive Optical Network 4

5 Trend in Number of Broadband Subscribers in Japan 3 M 30,000,000 Total BB user 25,000,000 Number of Subscribers 2 M 20,000,000 15,000,000 1 M 10,000,000 ADSL FTTH 5,000, 月 6 月 9 月 12 月 3 月 6 月 9 月 12 月 3 月 6 月 9 月 12 月 3 月 6 月 9 月 12 月 3 月 6 月 9 月 12 月 3 月 6 月 9 月 12 月 3 月 6 月 9 月 12 月 Jun. Dec. Jun. Dec. Jun. Dec. Jun. Dec. Jun. Dec. Jun. CATV Dec Jun. Dec. 5

6 Trend in Number of NTT s Broadband Subscribers (M ) 15 Number of Subscribers Sep. Mar. Sep. Mar. Sep. Mar. Sep. Mar. Sep. Mar. Sep. Mar. Sep. Mar. Sep. Mar. Sep. Mar

7 Change in ARPU from FTTH - The bundled FTTH service records a higher ARPU than the legacy POTS service. - Since the FTTH service can incorporate video delivery & other services, the ARPU is increasing gradually. - We must increase the ARPU further to strengthen our financial basis. (JPY) 5,000 5,050 5,310 4,650 4, FTTH ARPU of NTT East 7 ARPU : Average Revenue Per User

8 Launch Commercial NGN - Commercial NGN launched March 2008 for the first time anywhere in the world - NTT Plans for all Current FTTH services to be steadily transferred on NGN by the end of FY2010 8

9 High-Quality IP Telephony High-Quality IP Telephony - Widespread band Telephony (7kHz) - Video Phone (+Video mobile Phone) Fixed (Hikari( Hikari-TV) -Mobile Convergence (Planning) Video Conference 9

10 Video Services on FTTH Various video services are expected to expand FTTH demand. IP video RF video -VOD (>10,000 titles) -TV channels (> 70ch) -Karaoke (>13,000 songs) JPY (Monthly) -Broadcast re-transmission (Digital terrestrial, BS, CS (option) ) -More channels (280ch) 10

11 Boost of NTT s Video Services - NTT has promoted video services on NGN as a high priority - Total number of Video service user reached to 630,000 at the end of Q1 this year Number of Video Service user 1.5 M 1.0 M 0.5 M Launch NGN 2 nd stage Boost 1Q 2Q 3Q 4Q 1Q 2Q 3Q 4Q 1Q 2Q 3Q 4Q 1Q 2Q

12 NGN Service Joint-Development Forum To create more attractive services and new business models and values on NGN, Next-Generation Services Joint-Development Forum launched Open and Collaboration 12

13 1. Current NTT s FTTH Services 2. Key Technologies of GE-PON on NGN 3. Requirements of NG-PON systems 4. Standardization activity of 10G-EPON 5. R&D activity of 1G/10G dual-rate EPON 6. Summary 13

14 NTT s GE-PON system configuration - Compliant with IEEE standard 802.3ae - OLT is connected with up to 32 subscribers (ONU) - Connected ONUs are fairly controlled by DBA technique - Bundled IP telephony & IP-based Video services are provided - NTT has also provided re-transmission broadcast services in collaboration with the broadcast corporations by SCM-PON which is compliant with ITU-T G FM-converted signal transmission SCM-PON Broadcast Co. STB V-ONU HGW 1G-ONU UNI 1x8 1x4 V-OLT 1G -OLT SW Video delivery equipment NGN IP transport NW NNI SNI 14

15 Key Technologies of GE-PON on NGN - Dynamic Bandwidth Allocation (DBA) Priority Control High-Priority traffic (i. e. Video, Voice) Best-effort traffic (i.e. Internet) Fairness Efficiency Share the bandwidth in the same priority grade Need to guarantee the minimum bandwidth High bandwidth efficiency Low latency - PON Multicast function IP-based Video Delivery Service - Sub-Carrier Multiplexing (SCM) -PON RF-based Video Delivery Service re-transmission digital terrestrial broadcast services 15

16 Dynamic Bandwidth Allocation (DBA) DBA is the one of the key function, which discriminates Upstream bandwidth demands of each ONU and dynamically allocates bandwidth according to traffic situation in a short period of mmsec to use the total bandwidth effectively 1 Data ONU Gate frame (BW Request Confirmation) OLT GE-ONU#4 time 2 Report frame (BW request) 4 Gate frame(data Send Permission) Start time T1 and Data volume Report frame ( BW request ) 3 Bandwidth Allocation Bandwidth Best effort High-Priority GE-ONU#3 GE-ONU#2 GE-ONU#1 GE-ONU#0 5 T1 Data Gate & Report sequence 4-ONU connected 3-ONU 5-ONU 16

17 DBA for bandwidth efficiency -NTT has proposed Multiple Request Method suitable for variable Frame Length such as Ethernet-based PON in order to achieve high bandwidth efficiency and low latency Threshold Small request case ONU 1 ONU 2 Frame 3 Frame 2 Request #1 Frame 1 Request #2 Request #1 Request #1 Large request case ONU 1 ONU 2 ONU 3 ONU 4 Upstream buffer in ONU Request #2 1 cycle Request #1 17

18 PON Multicast Function - The video delivery signals are broadcasted to every ONU by using broadcast LLID - OLT is snooping the upstream MLD message from each ONU and check a request TV channel at each time - OLT controls a kind of channel selector of each ONU according to a request channel. STB HGW X 1G- ONU Video delivery Server STB STB HGW HGW 1G- ONU X 1G- ONU 1G -OLT MLDv2 snooping L2 SW MLD message NGN IP transport NW Other NW 18

19 Issues of Video Signal Transmission on SCM-PON Intensity-modulated Video Signal Transmission Noise-sensitive Difficult to have a large number of distribution ratio Need many optical repeaters Lack of cost-effectiveness Reflection-sensitive Installed condition in the Access-NW is more complex than in the Core-NW i.e. many connecting points Lack of video signal quality 19

20 FM-converted Video signal Transmission Frequency multiplexed video signals is simultaneously converted to wideband FM-signals to prevent signal degradation from noise and reflection affect. ITU-T J.185 Frequency Multiplexing Signal (70 ~ 770 MHz) Wideband FM-signal (0.5 ~ 6 GHz) Frequency Multiplexing Signal (70 ~ 770 MHz) f f f Video signal transmission equipment V-ONU FM demodulator PD V-OLT External Modulator LD AM/FM-converter PD FM LD Local LD Head end FM-demodulation IC Optical amplifier Analog LD Narrow line-width FM-LD 20

21 1. Current NTT s FTTH Services 2. Key Technologies of GE-PON on NGN 3. Requirements of NG-PON systems 4. Standardization activity of 10G-EPON 5. R&D activity of 1G/10G dual-rate EPON 6. Summary 21

22 Large Bandwidth Requirements Required Bandwidth (Mbps) New services will spur increased FTTH bandwidth demand - High Definition Multiple Channel Video Delivery Service by wide-screen monitor / by personal use - Re-transmission of digital terrestrial television over IP - Interactive network game NG-PON is needed to overcome lack of bandwidth issue MPEG-2 : SD 8 Mbps/ch : HD 30 Mbps/ch H.264 : HD 10Mbps/ch Web Up to 3ch (G-EPON) IP-TV -High Definition -Multiple Channel -Wide Screen NG-PON

23 Future Application SHD Broadcast Service 118 Optical access transmission is mandatory 2015 Test Broadcasting Service Launch Wireless Backhaul for LTE/4G Broadband and high splitting-ratio PON architecture would be suitable for Backhaul Network of Femto-cell base-stations Next generation PON 23

24 Progress in High Speed Ethernet and PON - About 7 years later, the bandwidth of PON has been steadily increasing as similar pace as Ethernet - According to this trend, the commercial of NG-PON i.e. 10Gclass PON will be expected during next decade 100G 10G Standardization Commercial 10GbE 100GbE 40GbE 10G-EPON? 1G 1GbE GE-PON 100M 100BASE-T ATM-PON B-PON 10M 10BASE-T STM-PON

25 Drivers of Hikari/NGN Services Expansion - In this NGN era, new service creation, NGN development, and Access NW innovation will progress with a synergistic relation - The requirement from new services will trigger innovation of NG-PON. On the contrary, the innovation will trigger the progress of Hikari/NGN based services. - These synergistic relation will lead to create a new market Hikari/NGN based Services trigger NGN/mobile progress trigger progress New Markets Synergistic relation Access NW GE-PON trigger innovation trigger NG-PON Time 25

26 NG-PON system requirements GE-PON system has already been widely deployed In terms of CAPEX, Employ same optical distribution network (ODN) -Standard SMF - Optical splitter (32 divided) - Link budget 29 db - Transmission distance up to 20 km - Bi-directional on one fiber Able to co-exist with existing GE-PON and RF video delivery system 26

27 1. Current NTT s FTTH Services 2. Key Technologies of GE-PON on NGN 3. Requirements of NG-PON systems 4. Standardization activity of 10G-EPON 5. R&D activity of 1G/10G dual-rate EPON 6. Summary 27

28 Standardization Organization for Optical Access ITU-T Study Group 15 Optical and other transport network infrastructures Question 2 Optical systems for fibre access networks G.983 (B-PON) G.984 (G-PON) G.985 (100M PtoP) G.986 (1G PtoP) G.987 (NG-PON) Proposal FSAN OAN-WG (Optical Access Network Working Group) B-PON, G-PON, NG-PON IEEE working group CSMA/CD (ETHERNET) 802.3ah EFM Ethernet in the First Mile 1000BASE-PX (GE- PON) 100BASE-BX (PtoP) 1000BASE-BX (PtoP) 802.3av 10G PHY 10GBASE-PR(10GE- PON) 28

29 10G-class PON standardization activity - IEEE 802.3av (10G-EPON) is focused on physical layer changes and the protocol at the MPCP layer is based on GE-PON. - Current status is D3.2, standardization will finish this September - ITU-T SG-15 will begin by discussing NG-PON as a main topic IEEE CFI Study Group TF Task Force (TF) D1.0 D2.0 D3.0 Apr June Mar May Jul Sep Nov Jan Mar May Jul Sep Nov Jan Mar May Jul Sep Nov Jan Mar Now D3.2 Consent May Jul Sep Plenary meeting Interim meeting ITU/IEEE Joint Workshop ITU-T/FSAN FSAN NGA TG ITU-T SG-15 NG-PON Physical layer XG-PON1 (down:10g up:2.5g) TC layer 29

30 Specifications of 10G-EPON Rate: - Asymmetric Down: Gbps, Up: 1.25 Gbps - Symmetric Down: Gbps, Up: Gbps Power budget class: Class PR10, PRX10 PR20, PRX20 PR30, PRX30 Insertion loss 5 10 db db db Support configuration 10 km 1:16 10 km 1:32, 20 km 1:16 20 km 1:32 PR: Symmetric PRX: Asymmetric FEC: - Asymmetric Down: RS( ) streaming FEC mandatory Up: RS( ) packet FEC option - Symmetric Down/Up: RS( ) streaming FEC mandatory 30

31 Specifications of 10G-EPON - The maximum value of the parameters of the burst overhead are almost equal value to that of GE-PON. - Laser On/Off time is valuable to enable to shorten an invaluable idle time Burst Overhead Symmetric Specification Asymmetric Guard time Laser on time 512ns MAX Laser off time 512ns MAX SYNC time Treceiver_settl ing 800ns MAX TCDR 400 ns MAX Tcode_align 6.4 ns Burst signal Laser Turn-on Receiver settling CDR lock Code Group align Treceiver_settling TCDR 400ns MAX 400ns MAX Tcode_align 3.2 ns Laser Turn-off Note 10G-EPON: valuable GE-PON: fixed IDLE Frame data 31

32 Wavelength Allocation for Co-existence - For downstream, the wavelength is decided to make it available for co-existence with legacy systems using WDM overlay technology. - For upstream, 1G/10G dual-rate TDMA technique is mandatory - Possible to co-exist with G-PON using WDM overlay technology Ex.1 Legacy system (GE-PON+Video) Dual-rate TDMA 100 nm space (Regular spec.) WDM 10G Down OTDR Up Up Down Video (10G (1G-EPON) (1G) ) Ex.2 Legacy system (G-PON+Video) λ(nm) WDM 20 or 40 nm space (Narrow or Reduced spec.) WDM 10G Down OTDR Up Up Down (G-PON) Video (10G (1G) ) λ(nm) 32

33 Approach of ITU-T/IEEE Collaboration - Continuous efforts at ITU-T/IEEE collaboration are under way. - NTT supports this approach. In band FCAPS; BBF WT-155 (TR-069 for PON) Service model; BBF WT-156 (TR-101 for PON) Out of band FCAPS; OMCI XG-PON common functions; DBA, SEC, PLOAM XG-PON1 TC TDMA, Act. GEM, FEC XG-PON1 PMD 10G/2.5G XG-PON1 MAC-C: MPCP MAC: Ethernet RS: LLID PCS: 64b66b FEC PMA: Burst mode PMD: 10G/10G, 1G/10G XG-PON2 (10G-EPON) 33

34 1. Current NTT s FTTH Services 2. Key Technologies of GE-PON on NGN 3. Requirements of NG-PON systems 4. Standardization activity of 10G-EPON 5. R&D activity of 1G/10G dual-rate EPON 6. Summary 34

35 Configuration of co-existing 1G/10G-EPON - 10G-EPON system and existing 1G-EPON co-exist on same ODN. - Upgraded 10G OLT will connect to both Symmetric ONU (D:10G/U:10G) and Asymmetric ONU (D:10G/U:1G). V-ONU 1G/1G ONU Broadcast Co. V-ONU V-OLT Video delivery equipment 10G/1G ONU Asymmetric ONU Upgrade! 1G/10G Dual-rate -OLT IP network V-ONU 1G-OLT 10G/10G ONU Symmetric ONU Upgrade! 35

36 Functional Block Diagram of Dual-rate OLT DBA Multi-point MAC control Dual rate MPCP 1G/1G MAC 1G/10G MAC 10G/10G MAC VLAN MAC RS PCS PMA RS GMII Tx Rx 8B/10B encoder PCS Rx Tx XGMII 64B/66B encoder Scrambler PCS VLAN MAC RS PCS PMA PMD FEC encoder FEC encoder PMD GbEther IF Ser/Des PMA Ser/Des 10GbEther IF 1G/10G Dual-rate PMD 1310 nm 1490 nm 1310 nm 1577 nm 1270 nm 1577 nm 1G/1G ー ONU 1G/10G ー ONU 10G/10G ー ONU GE-PON Asymmetric Symmetric 36

37 Main Technical Issues with 10G-EPON 1G/10G Dual-rate Multi Point MAC Control - Discovery Process - Dynamic Bandwidth Allocation 1G/10G Dual-rate PMD (transceiver) - High speed and Cost-effective Burst-mode Receiver - Dual-rate Burst-mode Receiver configuration 37

38 1G/10G Dual-rate Multi Point MAC Control Key Points - Discovery Information Field (GATE MPCPDU) 38

39 1G/10G Dual-rate DBA Key Points Priority Control High-Priority traffic (i. e. Video, Voice) Best-effort traffic (i.e. Internet) Fairness - Fair treatment for 1G and 10G subscribers The time needed to reach a required bandwidth should be the same at least Efficiency - Efficiency of total throughput The burst-overhead number strongly affects total throughput efficiency 39

40 Burst-mode Circuits Burst-mode signal receiving - ONU s laser turns on after receiving the permission from OLT - The distance difference between OLT and each ONU occurs the received signal amplitude difference in OLT Burst signal Laser Turn-on Receiver settling CDR lock Code Group align Laser Turn-off IDLE Frame data ONU #1 Downstream : Continues #1 #2 #N Tx grant time EQA CDR ONU #N-1 TIA LIA #N #1 #N-1 Rx CRC ONU Upstream : Burst OLT #N Burst-mode 3R receiver DEC 40

41 10G Burst-mode Transmission New design concept for AC-coupled burst-mode transmitter/receiver with no reset signal to achieve both quick response and easy to control - Utilize transition waveform Baseline-Wander common-mode rejection Reverse Distortion Two-stage average detection 41 S. Kimura, OECC2008 ThG-1 Nakamura et al, OFC2008 PDP26

42 1G/10G Dual-rate Burst Receiver (1) Discrimination between 1G and 10G signals with a variable low-pass filter and an output port selector synchronized with a rate select signal 1G 10G 1G 10G 1G 10G 1G 10G 1G 1G 1G output port APD TIA Rate Select Signal O-BUF T-LPF LA OPS 1G CDR 10G CDR 10G output port Serial LA configuration 10G 10G K. Hara et al, Electronics Lett., Vol.44, pp (2008) 42 OPS: Output Port Selector O-BUF: Offset voltage buffer

43 1G/10G Dual-rate Burst Receiver (2) Discrimination between 1G and 10G signals with a bit-rate discrimination circuit and gate circuits with no control signal 1G 10G 1G 10G 1G 10G 1G 10G 1G 1G APD TIA 1G-LA GC 1G CDR BDC 10G-LA GC Parallel LA configuration Gating signal 10G 10G CDR 10G K. Hara et al. ECOC2008, We2. F-1 43 BDC: Bit-rate Discrimination Circuit GC: Gate Circuit

44 Demonstration of 1G/10G dual-rate EPON NTT has demonstrated the first 1G/10G dual-rate symmetric 10GE-PON system at the Tsukuba forum G-EPON OLT 10G-EPON ONU 1G-EPON ONU 44

45 10G-EPON Extender To further boost FTTH deployment, PON Extender is available - Large Splitting-ratio in the Urban area - Long Distance transmission in the Rural area 10G-EPON is suitable for Extender because of its large capacity Urban area Large Splitting-ratio Rural area OLT OLT Long distance ITU-T G (PON Extender Box) consent 45

46 10G PON Extender with burst-mode optical amplifier Optical amplifier based PON Extender compactly integrated with up/downstream components - Optical burst mode operation with auto-level controlled output with dynamic range of 16.6 db - Enlarge loss budget of 42.8 db upstream 10-3 Inputs 400ns a.u. downstream Outputs Bit error rate without burst-amp 100ps (a)without burst-amp 34.1dB with burst-amp without OBPF with OBPF 50.4dB 100ps (b)without filter 100ps (a) 10.1dB (b) dB 42.6dB 42.8dB (c)without filter (c) 19.7dB (d) Total loss (db) (e) 23.8dB (f) 46 K.Suzuki_OFC2008_OThL3 K.Suzuki_OFC2009_OTuH1

47 Further Issues of 10G-EPON Power Saving - User increase of FTTH services - Progress in High speed technology i. e. GE-PON to 10G-EPON lead to increase of power consumption Reliability Need to reduce the power consumption, especially ONU Ability of power saving is one of the most important requirement of 10G-EPON Large capacity has a risk of large-scale service stop Need a kind of redundancy configuration Cost effectiveness Key point is cost reduction of optical component Expect to make de-fact standard of optical transceiver for 10G-EPON 47

48 Summary 10G-EPON is one of the most attractive candidate for next-generation PON systems, because of its technical similarity to 1G-EPON, which is used worldwide. 10G-EPON should have good backward compatibility and smooth upgradablity from 1G-EPON - Installed on same ODN - Co-exist with deployed 1G-EPON - Co-exist with asymmetric and symmetric ONUs Main technical issue is 1G/10G dual-rate operation - Dual-rate dynamic bandwidth assignment - Dual-rate burst-mode transmitter & receiver 48

49 Thank you very much 49