Current Status of the 10G-EPON Power Budget and Improvement David Li, Hisense-Ligent dli@ligentphotonics.com Ligent
Supporters Bo Wang, China Telecom David Li, Ligent Photonics Frank Chang, Vitesse Corp. Marek Hajduczenia, ZTE Corp. Page 2 September 2011 IEEE802.3 Interim
Outline Technical status of the EPON PMDs 10G-EPON deployment scenario Current status of the power budget in EPON and 10G-EPON Power budget Improvement for the extended 10G-EPON Summary Page 3 September 2011 IEEE802.3 Interim
Technical Status of EPON PMDs 1G-EPON PMDs have been deployed in tens of millions since 802.3ah was released in 2004. The 1G-EPON modules are available from many suppliers. 10G-EPON PMDs are available from several manufacturers. Such devices were considered state of the art when 802.3av-2009 was released. Link budget improvement and development of EPON transceivers has not stopped. The focus of new developments is on improving launch power and better sensitivity from the 1G and 10G PMD transceivers. Page 4 September 2011 IEEE802.3 Interim
New Demand on Link Budget for actual deployment 2008 2011 EPON >PX-20 PX-20+ PX-20++ GPON Class B+ Class C Class C+ Class C++ 10G-EPON >PR-20 PR-30 PR-40 PR-50 NG-PON1 N1 N2 E1 E2 Split Ratio Target 1:32 1:64 1:128 1:256 Link Budget (db) 29.5~30 31.5~32 33.5~34 35.5~36 Higher splitting ratio and longer reach is in demand. New technology and high performance devices are required for the new application Page 5 September 2011 IEEE802.3 Interim
10G-EPON Deployment Scenario In Asia, the 10G-EPON is mainly deployed for quad-wavelength or Triwavelength applications SFF ONU Quad-wavelength Symmetric OLT In US, the 10G-EPON is mainly preferred for dual wavelength symmetric applications SFP+ ONU SFP+ ONU XFP OLT Page 6 September 2011 IEEE802.3 Interim
Current Status (1G-EPON) 1G-EPON PMD Downstream Link 1G-EPON OLT TX Power (10521pcs) 1G-EPON ONU RX Sensitivity (10571pcs) tx 的过程能力 [Sens] 的过程能力 LB 2.5 7 样本均值 4.88122 样本 N 10321 标准差 ( 组内 ) 0.372483 标准差 ( 整体 ) 0.372474 LB LSL * -24 样本均值 -28.9233 样本 N 10371 标准差 ( 组内 ) 0.542275 标准差 ( 整体 ) 0.542262 0.84 1.68 2.52 3.36 4.20 5.04 5.88 6.72-32.4-31.2-30.0-28.8-27.6-26.4-25.2-24.0 PPM < LB 193.78 PPM > 96.89 PPM 合计 290.67 PPM > 0.00 PPM 合计 0.00 TX Power Rx Sensitivity Link Budget IEEE802.3ah PX20 +2dBm -24dBm 26dB Actual Min +3dBm -28dBm 31dB Actual Typical +4.5dBm -29dBm 33.5dB Current 1G-EPON modules can support for 31 db downstream link budget 1G-EPON could also support for higher power budget classes at least to 33-34dB, by tuning the components and tight the pass/fail criteria. Page 7 September 2011 IEEE802.3 Interim
Current Status (1G-EPON) 1G-EPON PMD upstream link 1G-EPON ONU TX Power (10448pcs) [txpow] 的过程能力 1G-EPON OLT RX Sensitivity (17716pcs) [Sens] 的过程能力 LB -1 4 样本均值 2.03759 样本 N 10448 标准差 ( 组内 ) 0.282672 标准差 ( 整体 ) 0.282665 LB LSL * -30 样本均值 -32.6766 样本 N 17716 标准差 ( 组内 ) 0.623768 标准差 ( 整体 ) 0.623759-0.8 0.0 0.8 1.6 2.4 3.2 4.0 4.8-43.2-41.4-39.6-37.8-36.0-34.2-32.4-30.6 PPM < LB 0.00 PPM > 95.71 PPM 合计 95.71 PPM > 56.45 PPM 合计 56.45 TX Power Rx Sensitivity Link Budget IEEE802.3ah PX20-1dBm -27dBm 26dB Actual Min +0.5dBm -30.5dBm 31dB Actual Typical +2.0dBm -32.5dBm 34.5dB Current 1G-EPON modules can support for 31 db upstream link budget. 1G-EPON could also support for higher upstream power budget classes to 34-35dB, by tuning the components and tight the pass/fail criteria. Page 8 September 2011 IEEE802.3 Interim
10G-EPON Downstream Current Status (10G-EPON) 10G-EPON OLT TX Power (2199pcs) 10G-EPON ONU RX Sensitivity (15441pcs) [txpow] 的过程能力 [Sens] 的过程能力 LB 2 7 样本均值 4.61282 样本 N 2199 标准差 ( 组内 ) 0.669137 标准差 ( 整体 ) 0.669061 LB LSL * -28.5 样本均值 -29.8473 样本 N 13441 标准差 ( 组内 ) 0.56068 标准差 ( 整体 ) 0.560669-1.4 0.0 1.4 2.8 4.2 5.6 7.0-31.5-31.0-30.5-30.0-29.5-29.0-28.5 PPM < LB 454.75 PPM > 0.00 PPM 合计 454.75 PPM > 0.00 PPM 合计 0.00 TX Power Rx Sensitivity Link Budget IEEE802.3av PR30 +2dBm -28.5dBm 30.5dB Actual Min +2dBm -28.5dBm 30.5dB Actual Typical +5dBm -30dBm 35dB Current 10G-EPON modules can support for 30.5dB downstream link budget, as defined in 802.3av (PR30). 10G-EPON could also support for higher downstream power budget classes up to 35dB, by tuning the components and tight the pass/fail criteria. Page 9 September 2011 IEEE802.3 Interim
Current Status (10G-EPON) 10G-EPON Asymmetric Upstream 10G-EPON Asymmetric ONU TX (4490pcs) 10G-EPON Asymmetric OLT RX (560pcs) [txpow] 的过程能力 [Sens] 的过程能力 LB 0.62 5.62 样本均值 3.2671 样本 N 4490 标准差 ( 组内 ) 0.279041 标准差 ( 整体 ) 0.279025 LB LSL * -29 样本均值 -31.8261 样本 N 560 标准差 ( 组内 ) 0.615408 标准差 ( 整体 ) 0.615133 0.7 1.4 2.1 2.8 3.5 4.2 4.9 5.6-33.0-32.4-31.8-31.2-30.6-30.0-29.4 PPM < LB 0.00 PPM > 0.00 PPM 合计 0.00 PPM > 0.00 PPM 合计 0.00 TX Power Rx Sensitivity Link Budget IEEE802.3av PRX30 +0.65dBm -29.78dBm 30.4dB Actual Min +2dBm -30dBm 32dB Actual Typical +3.5dBm -32dBm 35.5dB Current 10G-EPON PRX-30 modules can support for 32 db upstream link budget, as defined in 802.3av-2009. 10G-EPON could also support for higher upstream power budget classes up to 35.5dB, by tuning the components and tight the pass/fail criteria. Page 10 September 2011 IEEE802.3 Interim
Current Status (10G-EPON) 10G-EPON Symmetric Upstream 10G-EPON Symmetric ONU TX (22pcs) 10G-EPON Symmetric OLT RX (lab test data) TX Power Rx Sensitivity Link Budget IEEE802.3av PR30 +4dBm -28dBm 32dBm Actual Min +4dBm -29dBm 32dBm Actual Typical +5dBm -30dBm 35dBm Current 10G-EPON PR-30 modules can support for 32 db upstream link budget, as defined in 802.3av-2009. 10G-EPON could also support for higher upstream power budget classes, up to 35dB. Page 11 September 2011 IEEE802.3 Interim
Power Budget Improvement There are multiple ways of reaching higher power budget Increase transmitter launch power (improved lasers, external / internal amplifiers) Increase receiver sensitivity (improved receiver sensitivity, preamplifier) Include in-line amplification (reach extender) providing optical or OEO amplification for passing data streams Decrease the ODN loss (lower loss fiber, improved splitter design etc.) Page 12 September 2011 IEEE802.3 Interim
Power Budget Improvement on the OLT Improvement in the 10G Asymmetric OLT RX Sensitivity The OLT receiver sensitivity can be improved by optimizing the circuit Sensitivity (dbm) 0.000-5.000-10.000-15.000-20.000-25.000-30.000-35.000-40.000-45.000 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Current Improved The 10G-EPON asymmetric OLT receiver sensitivity can be improved from current -32.5dBm (average) to -37.5dBm. Qty The 10G-EPON symmetric OLT receiver sensitivity may be improved by optimizing the trans-impedance amplifier, adding pre-amplifications, or using the low loss mode conversion receiver. Page 13 September 2011 IEEE802.3 Interim
Power Budget Improvement (10G OLT TX Power) Recent Improvement on the 10G Symmetric OLT TX Power 40dB Link TX: +11dBm RX: -29dBm 35dB Link TX: 5dBm RX: -29dBm The 10G-EPON symmetric OLT TX power is improved from +5dBm to +11dBm. With the off the shelf 10G-EPON ONU, available power budget is 40dB in the downstream link. The upstream link budget is about 35dB now, which can be improved further by adding preamplifier. Page 14 September 2011 IEEE802.3 Interim
Summary The demand for link budget in the current 1G-EPON deployment far exceeds the original IEEE802.3ah spec. Based on the current component manufacturing technology, the 1G-EPON and 10G-EPON PMDs can support 33dB~35dB link budgets without dramatic changes in the manufacturing process and materials. It is suggested that the link budget of the extended 10G-EPON PMDs can be set as 37dB, in compliance with the FSAN 987.2 NG-PON1 E2 spec. To reach 37dB downstream link budget, the OLT TX power in the 1G-EPON and 10G-EPON can be increased by adding amplification with low cost solution. To reach 37dB upstream link budget, the OLT RX sensitivity in the 1G- EPON can be improved to -35dBm~-37dBm with the available technology. To reach 37dB upstream link budget in the 10G-EPON, the OLT RX sensitivity can be improved by using low loss receiver. Page 15 September 2011 IEEE802.3 Interim