下一代光接入網(wǎng)NG-PON2-李正璇

1、下一代光接入網(wǎng)下一代光接入網(wǎng)NG-PON2李正璇State Key Lab of Advanced Optical Communication Systems and Networks2012.11.21Outlines光通信網(wǎng)絡 Optical communication network光接入網(wǎng) Optical access network (FTTH,FTTB,FTTC)無源光網(wǎng)絡 Passive optical network(EPON、GPON）Next generation PON (NG-PON)Next generation PON stage 2 (NG-PON2)候選方案 T

2、WDM-PON關(guān)鍵技術(shù)及研究現(xiàn)狀結(jié)論 Conclusion光通信網(wǎng)絡光通信網(wǎng)絡Optical communication network骨干網(wǎng)（已光纖化）接入網(wǎng)（光纖化推進中）光纖接入網(wǎng)光纖接入網(wǎng)無源光網(wǎng)絡 Passive optical network (PON)OLT 和 ONU 之間沒有有源器件，便于鋪設(shè)和維護，節(jié)約運營成本根據(jù)用戶復用方式的不同，分為時分復用TDM-PON、波分復用WDM-PON、正交頻分復用OFDM-PON等OLT光線路終端光線路終端ODN光分配網(wǎng)絡光分配網(wǎng)絡ONU光網(wǎng)絡單元光網(wǎng)絡單元TDM-PONTDM-PON 遠端節(jié)點采用光分路器splitter分光用戶利用不同的

3、時隙收發(fā)數(shù)據(jù)EPON(1G/1G GPON(2.5G/1G)已商用速率較低，MHz for eachNG-PON2007年，全業(yè)務接入網(wǎng)論壇（FSAN）提出構(gòu)建下一代無源光網(wǎng)絡（NG-PON1）緊接著提出了NG-PON2，進一步提高速率 NG-PON2TDM-PON 將單波長傳輸速率提高到40G 高速突發(fā)收發(fā)模塊實現(xiàn)困難、成本高，調(diào)制啁啾，色散等WDM-PON 多波長復用，提高速率 在遠端節(jié)點采用陣列波導光柵（AWG）作為分光器件，與現(xiàn)在鋪設(shè)的基于splitter的系統(tǒng)不兼容OFDM-PON將數(shù)據(jù)調(diào)制到正交的子載波上，提高頻帶利用率 實時系統(tǒng)需要較復雜的高速DSP處理，不適于接入網(wǎng)應用TWDM

4、-PON混合時分/波分復用無源光網(wǎng)絡將幾個工作于不同波長的TDM-PON復用到一個系統(tǒng)中，遠端節(jié)點仍采用splitter分光，與現(xiàn)有系統(tǒng)兼容，容易實現(xiàn)。TWDM-PON was selected in Apr 2012 as the architecture for NG-PON2.關(guān)鍵技術(shù)關(guān)鍵技術(shù)OLT端可以用WDM實現(xiàn)波長復用和解復用，發(fā)射可采用DFB激光器陣列為便于系統(tǒng)的構(gòu)建和維護，用戶端需要采用無色ONU,即所有用戶都配置結(jié)構(gòu)相同的ONUONU端需要可調(diào)收發(fā)可調(diào)接收- Tunable filter可調(diào)發(fā)射可調(diào)發(fā)射- Tunable transmitter基于基于FP-LD的無色光源的無

5、色光源自發(fā)輻射譜注入鎖定后下行波長注入鎖定自注入鎖定缺點：發(fā)射波長固定，不能靈缺點：發(fā)射波長固定，不能靈活調(diào)節(jié)活調(diào)節(jié)基于基于RSOA的無色光源的無色光源自發(fā)輻射譜注入鎖定后下行重調(diào)制自激勵1520154015601580-30-25-20-15-10-515301535154015451550-70-60-50-40-30-20-100Optical power (dBm)Wavelength (nm)缺點：調(diào)制缺點：調(diào)制帶寬帶寬35dB ) 以支持更長的傳輸距離和更多的 用戶結(jié)構(gòu)簡單 后向兼容(backward compatible)低成本(Low cost)參考文獻參考文獻1 E.Skal

6、jo, et al., “Migration from G(E)PON to NGPON,” in Proceeding of International Conference on Ultra Modern Telecommunications & Workshops,2009, pp. 14.2P. Heron, “Next generation optical access networks,” in Proceedings of Advanced Photonics Congress Access Networks and In-House Communications, 20

7、11, Paper AMA2.3Y. Ma, et al., “Demonstration of a 40Gb/s Time and Wavelength Division Multiplexed Passive Optical Network Prototype System”, in Proceedings of Optical Fiber Communication Conference, 2012, Paper PDP5D.7.4 C.H. Yeh, et al., “Using OOK Modulation for Symmetric 40-Gb/s Long-Reach Time

8、sharing Passive Optical Networks”, Photon. Technol. Let.vol.22, pp. 619-621, 2010.5 Effenberger, Frank, “XG-PON1 versus NG-PON2 : Which One Will Win ?” ECOC2012, paper Tu.4.B.16 Zhengxuan Li . etc “Compatible TDM/WDM PON using a Single Tunable Optical Filter for both Downstream Wavelength Selection

9、and Upstream Wavelength Generation,” PTL, vol.24,pp.797-799,20127 Min Zhu etc,“An upstream multi-wavelength shared PON based on tunable self-seeding Fabry-Prot laser diode for upstream capacity upgrade and wavelength multiplexing,” Optics Express, vol. 19, pp. 8000-8010, 20118 Perer Vetter, “Next genera