Ligent

Current Status of the 10G-EPON Power Budget and Improvement

David Li, Hisense-Ligent

dli@ligentphotonics.com

Page 2 September 2011 IEEE802.3 Interim

Supporters

Bo Wang, China Telecom

David Li, Ligent Photonics

Frank Chang, Vitesse Corp.

Marek Hajduczenia, ZTE Corp.

Page 3 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 4 September 2011 IEEE802.3 Interim

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.

Technical Status of EPON PMDs

Page 5 September 2011 IEEE802.3 Interim

New Demand on Link Budget – for actual deployment

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

2008 2011

Page 6 September 2011 IEEE802.3 Interim

10G-EPON Deployment Scenario

SFP+ ONU

XFP OLT

SFF ONU

In Asia, the 10G-EPON is mainly deployed for quad-wavelength or Tri-wavelength applications

Quad-wavelength Symmetric OLT

In US, the 10G-EPON is mainly preferred for dual wavelength symmetric applications

SFP+ ONU

Page 7 September 2011 IEEE802.3 Interim

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.

6.725.885.044.203.362.521.680.84

LB UB

LB 2.5

目标 *

UB 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

过程数据

Cp *

CPL *

CPU *

Cpk *

Pp *

PPL *

PPU *

Ppk *

Cpm *

整体能力

潜在（组内）能力

PPM < LB 193.78

PPM > UB 96.89

PPM 合计 290.67

实测性能

PPM < LB *

PPM > UB *

PPM 合计 *

预期组内性能

PPM < LB *

PPM > UB *

PPM 合计 *

预期整体性能

组内

整体

tx 的过程能力

-24.0-25.2-26.4-27.6-28.8-30.0-31.2-32.4

UB

LSL *

目标 *

UB -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

过程数据

Cp *

CPL *

CPU *

Cpk *

Pp *

PPL *

PPU *

Ppk *

Cpm *

整体能力

潜在（组内）能力

PPM < LSL *

PPM > UB 0.00

PPM 合计 0.00

实测性能

PPM < LSL *

PPM > UB *

PPM 合计 *

预期组内性能

PPM < LSL *

PPM > UB *

PPM 合计 *

预期整体性能

组内

整体

[Sens] 的过程能力

1G-EPON PMD Downstream Link Current Status (1G-EPON)

1G-EPON OLT TX Power (10521pcs) 1G-EPON ONU RX Sensitivity (10571pcs)

TX Power Rx Sensitivity Link Budget IEEE802.3ah PX20 +2dBm -24dBm 26dB Actual Min +3dBm -28dBm 31dB Actual Typical +4.5dBm -29dBm 33.5dB

Page 8 September 2011 IEEE802.3 Interim

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.

4.84.03.22.41.60.80.0-0.8

LB UB

LB -1

目标 *

UB 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

过程数据

Cp *

CPL *

CPU *

Cpk *

Pp *

PPL *

PPU *

Ppk *

Cpm *

整体能力

潜在（组内）能力

PPM < LB 0.00

PPM > UB 95.71

PPM 合计 95.71

实测性能

PPM < LB *

PPM > UB *

PPM 合计 *

预期组内性能

PPM < LB *

PPM > UB *

PPM 合计 *

预期整体性能

组内

整体

[txPow] 的过程能力

-30.6-32.4-34.2-36.0-37.8-39.6-41.4-43.2

UB

LSL *

目标 *

UB -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

过程数据

Cp *

CPL *

CPU *

Cpk *

Pp *

PPL *

PPU *

Ppk *

Cpm *

整体能力

潜在（组内）能力

PPM < LSL *

PPM > UB 56.45

PPM 合计 56.45

实测性能

PPM < LSL *

PPM > UB *

PPM 合计 *

预期组内性能

PPM < LSL *

PPM > UB *

PPM 合计 *

预期整体性能

组内

整体

[Sens] 的过程能力

1G-EPON PMD upstream link Current Status (1G-EPON)

1G-EPON ONU TX Power (10448pcs) 1G-EPON OLT RX Sensitivity (17716pcs)

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

Page 9 September 2011 IEEE802.3 Interim

10G-EPON Downstream

7.05.64.22.81.40.0-1.4

LB UB

LB 2

目标 *

UB 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

过程数据

Cp *

CPL *

CPU *

Cpk *

Pp *

PPL *

PPU *

Ppk *

Cpm *

整体能力

潜在（组内）能力

PPM < LB 454.75

PPM > UB 0.00

PPM 合计 454.75

实测性能

PPM < LB *

PPM > UB *

PPM 合计 *

预期组内性能

PPM < LB *

PPM > UB *

PPM 合计 *

预期整体性能

组内

整体

[txPow] 的过程能力

-28.5-29.0-29.5-30.0-30.5-31.0-31.5

UB

LSL *

目标 *

UB -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

过程数据

Cp *

CPL *

CPU *

Cpk *

Pp *

PPL *

PPU *

Ppk *

Cpm *

整体能力

潜在（组内）能力

PPM < LSL *

PPM > UB 0.00

PPM 合计 0.00

实测性能

PPM < LSL *

PPM > UB *

PPM 合计 *

预期组内性能

PPM < LSL *

PPM > UB *

PPM 合计 *

预期整体性能

组内

整体

[Sens] 的过程能力

10G-EPON OLT TX Power (2199pcs) 10G-EPON ONU RX Sensitivity (15441pcs)

Current Status (10G-EPON)

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 10 September 2011 IEEE802.3 Interim

10G-EPON Asymmetric Upstream

5.64.94.23.52.82.11.40.7

LB UB

LB 0.62

目标 *

UB 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

过程数据

Cp *

CPL *

CPU *

Cpk *

Pp *

PPL *

PPU *

Ppk *

Cpm *

整体能力

潜在（组内）能力

PPM < LB 0.00

PPM > UB 0.00

PPM 合计 0.00

实测性能

PPM < LB *

PPM > UB *

PPM 合计 *

预期组内性能

PPM < LB *

PPM > UB *

PPM 合计 *

预期整体性能

组内

整体

[txPow] 的过程能力

-29.4-30.0-30.6-31.2-31.8-32.4-33.0

UB

LSL *

目标 *

UB -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

过程数据

Cp *

CPL *

CPU *

Cpk *

Pp *

PPL *

PPU *

Ppk *

Cpm *

整体能力

潜在（组内）能力

PPM < LSL *

PPM > UB 0.00

PPM 合计 0.00

实测性能

PPM < LSL *

PPM > UB *

PPM 合计 *

预期组内性能

PPM < LSL *

PPM > UB *

PPM 合计 *

预期整体性能

组内

整体

[Sens] 的过程能力

10G-EPON Asymmetric ONU TX (4490pcs) 10G-EPON Asymmetric OLT RX (560pcs)

Current Status (10G-EPON)

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 11 September 2011 IEEE802.3 Interim

10G-EPON Symmetric Upstream 10G-EPON Symmetric ONU TX (22pcs) 10G-EPON Symmetric OLT RX (lab test data)

Current Status (10G-EPON)

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 12 September 2011 IEEE802.3 Interim

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.)

Power Budget Improvement

Page 13 September 2011 IEEE802.3 Interim

Improvement in the 10G Asymmetric OLT RX Sensitivity Power Budget Improvement on the OLT

-45.000

-40.000

-35.000

-30.000

-25.000

-20.000

-15.000

-10.000

-5.000

0.0001 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.

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.

The OLT receiver sensitivity can be improved by optimizing the circuit Qty

Sen

sitiv

ity (d

Bm

)

Page 14 September 2011 IEEE802.3 Interim

Power Budget Improvement (10G OLT TX Power) Recent Improvement on the 10G Symmetric OLT TX Power

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.

TX: 5dBm RX: -29dBm

TX: +11dBm RX: -29dBm

40dB Link

35dB Link

Page 15 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.