IEC, 86B Collaboration project

Sensitivity of 40G NRZ optic link to connector quality:

BER and Eye Diagram data

Melbourne, Oct 2011

IEC, 86B Collaboration project

2 Celestica | Regional Optoelectronics Laboratory

Project Contributors

Celestica International Inc

Vittawat Phunnarungsi, Rutsuda Thongdaeng,

Tatiana Berdinskikh, Robert Suurmann and George Lim

Orange Labs, Polish Telecom

Andrzej Tymecki

TE Connectivity

Mike Gurreri and Joshua Webb

EXFO

Gwennael Amice

Agilent Technologies

John Dorighi

JDSU

Matt Brown and Matt Adams

Giorgio Friedrich


Agenda

Introduction

Project Objectives

Sample preparation

Experimental Methodology & Test Setup

Experimental data

Bit Error Rate

Eye Diagram

Jitter, Q-factor

Conclusions

Next steps


The presentation of “ Investigation of impact of

connector quality on 40Gbit/s link performance :

Design of Experiment” was reviewed by the members

of IEC, 86B, WG4 and WG6 in Taormina, Apr, 2011

This investigation is critical for 40G applications

It was suggested to create the conditions for

multipath interference by adding to the link multiple

connectors with different connector quality

Investigate the impact of multiple connectors

separated with a fiber (1km, 2km, and 3km) on

40G link parameters

Comments from IEC, 86B meeting in Taormina


Objectives

Investigate the impact of multiple connectors with

different connector quality endface ( with scratches

and pristine) on 40G NRZ Optical link transmission

Investigate the impact of multiple connectors

separated with a fiber (1, 2 and 3km) on 40G NRZ

Optical link transmission

Understand if industry standards on connector quality

and cleanliness are sufficient for 40G applications


Sample Layout

DUT SC

SCA SCU SCA SCA SCA

0.5 m

250 m

10 m 10 m 1 m

2 mm

jacket

2 mm

jacket 2 mm

jacket

QTY: 1 QTY: 1 QTY: 2 per group QTY: 2 per group

Experimental Cables ( DUTs) and Reference

cables were prepared by TE Connectivity

DUT Assembly

Reference

cable Pigtail will be

spliced to fiber spool


Sample characterization by TE Connectivity

Experimental Groups 1-6

RL of mated connector pair was in a range (26.8-28.9)dB for Group 1, in a

range of (40-42.7)dB for Group 2 and in a range of (60.3-63.3)dB for Group3

All connectors have low attenuation (<0.1dB) and low PDL (≤0.012dB)

Group # RL Qty Connector Type

1 20-30 2 LC/UPC

2 40-50 2 LC/UPC

3 60-70 2 LC/UPC

4 60-70 2 SC/UPC

5 60-70 2 SC/APC

6 >80 2 SC/APC


Connector Endface, IL & RL Data

Group 1, Sample1A,

IL=0.07dB, RL=28.9dB

Group 2, Sample1B

IL=0.08dB, RL=40dB

Group 3, Sample1A


Group 4, Sample1A

UL=0.02dB, RL=61.9dB

Group 5, Sample1B

IL=0.12dB, RL=60.57dB Group 6, Sample1A


IL and RL data @1310 nm


Compare BERT, Eye Diagram, Jitter and Q-factor performance

Setup #1: 2 DUTs , same group. No fiber spool between DUT( Test Setup1)

Setup#2: 2 DUTs , same group . Separate DUT1 and DUT2 with fiber spool 1km, 2km, and 3 km (Test Setup 2)

Setup#3: No DUT. Fiber spool 1km, 2km, and 3 km (Test Setup 3)

Setup#4: (Test setup 4)

4 DUTs from Group 1 &2 in serial

4 DUTs from Group 3 &4 in serial and


Setup#5: separate DUT1 and DUT2 with fiber spool 1 km and DUT3 and DUT 4 with fiber spool 2 km (Test Setup 5)


4 DUTs from Group 3 &4 in serial and


Eye Diagram, Jitter and Q-factor

measurements


Test Setup Summary

Setup#1

Setup#2

Setup#3

Setup#4

Setup#5

Group1

Group2

Group3

Group4

Group5

Group6

Sample1 Sample2

1km

2km

3km

Initial setup Repeat setup

2

3

4

5

6

1

1

1

1

2

3

2

3

2 4 No Fiber 3

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18


SCA

4 SCA

3 SCA

ATTEN#1 Power Controller

FCA FCA

DCA-J Eye / Jitter

2.4GHz CLK

ILX Optical Power Meter

OSA OSNR Monitor

1

2

Tx

Rx

BER Analyzer

Yokogawa

NX4000

NX4000 40/43G BERT

SCU

SCU

EDFA Optical Amplifier

SCA SCA

SCA

SCA

SCU

DUT1 LC/UPC

SCA SCA

•Investigate the impact of 2 DUTs from the same Group

on optical performance[ BERT, Eye diagram, Jitter, etc]

•DUT1 is Group N sample 1

•DUT2 is Group N sample 2 N = 1, 2, …,6

DUT2 LC/UPC

SCA SCA

Setup#1

Investigation of multipath interference

Setup#1


SCA

4 SCA

3 SCA


FCA FCA

DCA-J Eye / Jitter

2.4GHz CLK


OSA OSNR Monitor

1

2

Tx

Rx

BER Analyzer

Yokogawa

NX4000

NX4000 40/43G BERT

SCU

SCU


SCA SCA

SCA

SCA

SCU

Fiber Spool CD

SCA SCA

DUT1 LC/UPC

SCA SCA

With 1km Fiber spool in the middle

DUT1 is Group N sample 1

DUT2 is Group N sample 2 N = 1, 2, …,6

Repeat 1km Fiber Spool with 2km, and 3 km

DUT2 LC/UPC

SCA SCA

Setup#2


Setup#2


SCA

4 SCA

3 SCA


FCA FCA

DCA-J Eye / Jitter

2.4GHz CLK


OSA OSNR Monitor

1

2

Tx

Rx

BER Analyzer

Yokogawa

NX4000

NX4000 40/43G BERT

SCU

SCU


SCA SCA

SCA

SCA

SCU

Fiber Spool CD

SCA SCA

Setup#3

•No DUT

•Fiber Spool 1 km, 2 km, and 3 km


Setup#3


SCA

4 SCA

3 SCA


FCA FCA

DCA-J Eye / Jitter

2.4GHz CLK


OSA OSNR Monitor

1

2

Tx

Rx

BER Analyzer

Yokogawa

NX4000

NX4000 40/43G BERT

SCU

SCU


SCA SCA

SCA

SCA

SCU

Setup#4

•Modified Setup for the investigation of multipath

interference 4 DUTs

•Setup4A: Group 1Sample1&2 and Group 2 Sample 1&2

•Setup4B: Group 3Sample1&2 and Group 4 Sample 1&2

•Setup4C: Group 5Sample1&2 and Group 6 Sample 1&2

DUT1 LC/UPC

SCA SCA

DUT2 LC/UPC

SCA SCA

DUT3 LC/UPC

SCA SCA

DUT4 LC/UPC

SCA SCA


Setup#4


SCA

4 SCA

3 SCA


FCA FCA

DCA-J Eye / Jitter

2.4GHz CLK


OSA OSNR Monitor

1

2

Tx

Rx

BER Analyzer

Yokogawa

NX4000

NX4000 40/43G BERT

SCU

SCU


SCA SCA

SCA

SCA

SCU

Setup#5

Setup for the investigation of multipath interference 4 DUTs

DUT1 is Group N Sample1 DUT2 is Group N Sample 2

N is 1,3 and 5

DUT3 is Group M sample 1 DUT 2 is Group M sample 2

M is 2, 4,and 6

Separate DUT1 and DUT2 with fiber spool 1 km

Separate DUT3 and DUT4 with fiber spool 2 km

Fiber Spool CD

Fiber Spool CD

DUT LC/UPC

SCA SCA

DUT LC/UPC

SCA SCA

DUT LC/UPC

SCA SCA

DUT LC/UPC

SCA SCA SCA SCA SCA SCA

1km 2km


Setup#5


BERT & Eye Diagram Measurement

BERT Setup

40Gbps NRZ

PRBS15

3 mins measurements, 3 times

1dB step

DCA Setup

Receiver = 8dBm (at ILX power meter)

500 waveforms

3 patterns for jitter measurement, 3 times


BER Result

Result from setup 1

Setup1 : two connectors from the same group. Example: Group1 sample1 connect to group1 sample 2, No

additional fiber in between.

No significant impact of connector Group to the BER curve was observed.

BER

Setup 1 : DUT-DUT

1.E-11

1.E-10

1.E-09

1.E-08

1.E-07

1.E-06

1.E-05

1.E-04

1.E-03

1.E-02

1.E-01

1.E+00

-17.0 -16.0 -15.0 -14.0 -13.0 -12.0 -11.0 -10.0 -9.0

power

(dBm)

BER

Group1

Group2

Group3

Group4

Group5

Group6


BER Result

Setup#2

Result from setup 2

Setup2-1km : Group1 sample1 connect to group1 sample 2, with additional 1km fiber in the middle



No significant impact of connector quality on BER curve was observed

BER

Setup 2-(1km) : DUT - 1km - DUT

1.E-12

1.E-11

1.E-10

1.E-09

1.E-08

1.E-07

1.E-06

1.E-05

1.E-04

1.E-03

1.E-02

1.E-01

1.E+00

-17.0 -16.0 -15.0 -14.0 -13.0 -12.0 -11.0 -10.0 -9.0

power

(dBm)

BER

Group1

Group2

Group3

Group4

Group5

Group6

BER


1.E-10

1.E-09

1.E-08

1.E-07

1.E-06

1.E-05

1.E-04

1.E-03

1.E-02

1.E-01

1.E+00

-17.0 -16.0 -15.0 -14.0 -13.0 -12.0 -11.0 -10.0 -9.0

power

(dBm)

BER

Group1

Group2

Group3

Group4

Group5

Group6

BER


1.E-13

1.E-12

1.E-11

1.E-10

1.E-09

1.E-08

1.E-07

1.E-06

1.E-05

1.E-04

1.E-03

1.E-02

1.E-01

1.E+00

-17.0 -16.0 -15.0 -14.0 -13.0 -12.0 -11.0 -10.0 -9.0

power

(dBm)

BER

Group1

Group2

Group3

Group4

Group5

Group6


BER Result

Setup#2

When a fiber length increased from no fiber to 1km, 2km, and 3km, the BER curve was shifted up.

There is no difference between BER curves for setups with different Groups but with similar fiber

length.

BER

DUT - Fiber - DUT

1.E-13

1.E-12

1.E-11

1.E-10

1.E-09

1.E-08

1.E-07

1.E-06

1.E-05

1.E-04

1.E-03

1.E-02

1.E-01

1.E+00

-17.0 -16.0 -15.0 -14.0 -13.0 -12.0 -11.0 -10.0 -9.0

power

(dBm)

BER

DUT+0km

DUT+1km

DUT+2km

DUT+3km


BER

NO DUT: No Fiber, 1km, 2km, and 3km

1.E-13

1.E-12

1.E-11

1.E-10

1.E-09

1.E-08

1.E-07

1.E-06

1.E-05

1.E-04

1.E-03

1.E-02

1.E-01

1.E+00

-17.0 -16.0 -15.0 -14.0 -13.0 -12.0 -11.0 -10.0 -9.0

power

(dBm)

BER

No Fiber

1km

2km

3km

Setup#3

Only fiber No DUT

BER data were increased when a fiber length was increased from 0 km up to 3 km.

BERT data for optical link with

different fiber length


Setup#4

Setup4-A: Group1 Sample1&2 and

Group2 Sample 1&2

Setup4-B: Group3 Sample1&2 and

Group4 Sample 1&2

Setup4-C: Group5 Sample1&2 and

Group6 Sample 1&2

Setup#5

4 DUT connected in serial, with 1 and 2km

fibers.

No difference of BER between each group

BER

Setup 4 : 4xDUT in serial

1.E-11

1.E-10

1.E-09

1.E-08

1.E-07

1.E-06

1.E-05

1.E-04

1.E-03

1.E-02

1.E-01

1.E+00

-17.0 -16.0 -15.0 -14.0 -13.0 -12.0 -11.0 -10.0 -9.0

power

(dBm)

BER

Setup4-A

Setup4-B

Setup4-C

BER

Setup 5 : 4xDUT with 1 and 2 km Fiiber

1.E-11

1.E-10

1.E-09

1.E-08

1.E-07

1.E-06

1.E-05

1.E-04

1.E-03

1.E-02

1.E-01

1.E+00

-17.0 -16.0 -15.0 -14.0 -13.0 -12.0 -11.0 -10.0 -9.0

power

(dBm)

BER

Setup5-A

Setup5-B

Setup5-C



There is no difference of BER curves for the links with different connector groups

but with the same fiber length


Setup#4

3 measurements of setup 4 (Setup4-A, 4-

B and 4-C) has a similar BER curve to

setup1 with No fiber (DUT+0km) and

setup3 Ref (No fiber, No DUT)

Setup#5

3 measurements of setup 5 (Setup5-A, 5-B

and 5-C) has a similar BER curve to setup2

with 3km Fiber (DUT+3km) and setup3 3km

Fiber.

BER

Setup 4 : compared to other setup

1.E-13

1.E-12

1.E-11

1.E-10

1.E-09

1.E-08

1.E-07

1.E-06

1.E-05

1.E-04

1.E-03

1.E-02

1.E-01

1.E+00

-17.0 -16.0 -15.0 -14.0 -13.0 -12.0 -11.0 -10.0 -9.0

power

(dBm)

BER

DUT+0km

Ref

1km

2km

3km

Setup4-A

Setup4-B

Setup4-C

BER

Setup 5 : compared to other setup

1.E-13

1.E-12

1.E-11

1.E-10

1.E-09

1.E-08

1.E-07

1.E-06

1.E-05

1.E-04

1.E-03

1.E-02

1.E-01

1.E+00

-17.0 -16.0 -15.0 -14.0 -13.0 -12.0 -11.0 -10.0 -9.0

power

(dBm)

BER

DUt+3km

Ref

1km

2km

3km

Setup5-A

Setup5-B

Setup5-C




Eye Diagram

Setup1: DUT to DUT

Group 1 Group 2 Group 3


There is no significant change in Eye diagram for the links with different connector

assembly.


Eye Diagram

Setup2: DUT-2km-DUT



With 2km Fiber in the middle between 2 DUT of the same group.

There is No significant change between each group, example group 3 and group 6.


Eye Diagram

Setup3: only Fiber, No DUT

No Fiber 1km

2km 3km

The increasing of the fiber length from 0km to 3km was resulted in eye degradation


Eye Diagram

Setup4: 4xDUT

Group 1&2 Group 3&4 Group 5&6


No significant change on eye for the links with different connectors Groups, eye is

still clean.


Eye Diagram

Setup5: DUT+1km+DUT+DUT+2km+DUT



There is 1km and 2km fiber between DUT for this setup, the total fiber is 3km.

Eye is degrading, but no significant difference between the optical links with different

connector groups.


Fiber length effects to Jitter

Q-Factor

0.0

10.0

20.0

30.0

40.0

50.0

60.0

70.0

80.0

1 2 3 4 5 6 Group

Q

DUT-DUT

DUT+1km

DUT+2km

DUT+3km

RJ

3.5E-133.6E-13

3.7E-133.8E-133.9E-134.0E-13

4.1E-134.2E-134.3E-134.4E-13

4.5E-134.6E-13

1 2 3 4 5 6 Group

sec

DUT-DUT

DUT+1km

DUT+2km

DUT+3km

There is no significant difference in Q-factor and Random Jitter (RJ) for the

links with different connector Groups ( Test setup 1 &2).

The insertion of 3km fiber resulted into decrease of Q-factor from ~60dB down

to ~ 30dB. RJ increased from ~0.39 ps (no fiber) to ~0.43ps for a link with 3km

fiber


Other Jitter

Total Jitter (TJ)

6.0E-12

8.0E-12

1.0E-11

1.2E-11

1.4E-11

1.6E-11

1.8E-11

1 2 3 4 5 6 Group

sec

DUT-DUT

DUT+1km

DUT+2km

DUT+3km

Periodic Jitter (PJ)

5.0E-13

1.0E-12

1.5E-12

2.0E-12

2.5E-12

3.0E-12

3.5E-12

1 2 3 4 5 6 Group

sec

DUT-DUT

DUT+1km

DUT+2km

DUT+3km

Periodic Jitter (PJrms)

0.0E+00

2.0E-13

4.0E-13

6.0E-13

8.0E-13

1.0E-12

1.2E-12

1 2 3 4 5 6 Group

sec

DUT-DUT

DUT+1km

DUT+2km

DUT+3km

Deterministic Jitter (DJ)

0.0E+00

2.0E-12

4.0E-12

6.0E-12

8.0E-12

1.0E-11

1.2E-11

1 2 3 4 5 6 Group

sec

DUT-DUT

DUT+1km

DUT+2km

DUT+3km

No significant impact of connectors from different groups on

Jitter ( TJ, DJ) was observed

High variability of Periodic Jitter has been observed


Setups 4 & 5: Q-Factor and Jitter

Q-Factor

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

1-2 3-4 5-6 Group

Q

Setup 4

Setup 5

RJ

3.90E-13

4.00E-13

4.10E-13

4.20E-13

4.30E-13

4.40E-13

4.50E-13

4.60E-13

4.70E-13

4.80E-13

1-2 3-4 5-6 Group

sec

Setup 4

Setup 5

•Q-factor for the links with 4 DUTs ( test setup 4) was ~60dB, RJ~0.42ps. No

significant impact of connector Group on Q-factor and RJ performance was found.

•Q-factor was reduced down to 30dB and RJ increased up to ~0.47ps when 3km fiber

was added to the link ( test setup #5)


Conclusions

The impact of multiple connectors with different connector quality

on optical performance of 40G NRZ link was investigated ( BER,

Eye diagram, Jitter, Q-factor)

It was no significant change in BER performance, Eye diagram,

Q-factor, Jitter (Total Jitter, Random Jitter and Deterministic

Jitter) for the links with different connector assemblies but with

the same fiber length of optical link.

The insertion of fiber ( up to 3km) resulted in degradation of BER

curve, Eye diagram, Q-factor and Random Jitter.

The 40G NRZ link with multiple cables assemblies (2-4

assemblies) and a fiber ( up to 3 km) fiber demonstrated

significant tolerance to polishing scratches ( no multipath

interference was observed)


Conclusions & Next steps

No significant difference in performance of 40G NRZ link with

different connector types ( SC/UPC, SC/APC and LC/UPC) was

identified.

Next Steps:

Investigate the impact of contaminated connectors on 40G NRZ

link optical performance

Investigate the impact of CD, PMD and OSNR on BER, Eye

diagram, Jitter and Q-factor of 40G NRZ link with multiple

experimental connectors

Investigate the impact of scratched/contaminated connectors on

40G DP-QPSK performance ( BER performance)


Thank you

IEC, 86B Collaboration project

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