Proposal to standardize evaluation and criteria for ...thor.inemi.org/webdownload/2015/OFC_iNEMI_Opto_032315/...Proposal to standardize evaluation and criteria for “contamination

Proposal to standardize evaluation and criteria for “contamination – repellant”

by connector insertion/extraction

MAR-23-2015

TOTO LTD.

Electronic Devices Development Section

Satoshi Kaneyuki

2

Contents

1. Introduction

2. Adhered contamination mechanism

3. Evaluation methods and criteria

4. Research and study result

5. Conclusion

Confidential

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1. Introduction Confidential

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The data traffic has been increased rapidly. More updated optical communication

network infrastructures needed to support the data traffic.

It is one of key factor for maintaining the stable and good optical data

transmission if we can keep the cleanness of connector surface as long

as possible.

Optical connector basic characteristic needs to maintain

the cleanness to avoid any data transmission loss.

Source: Cisco VNI Mobile, 2015

4

1. Introduction Confidential

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IEC-standards have been published “cleanliness on the physical contact “PC”

surface” IEC61300-3-35 : Fiber optic interconnecting devices and passive optical components

IEC61300-3-44 : Fiber optic interconnecting devices and passive optical components

There is no standard of “Contamination-repellant”.

If “Contamination-repellant” standard has clarified and standardized.

All of connector plugs will be qualified this repellant functionality. This

is a major contribution to the contamination problem.

1) Contamination adhesion

and moving mechanisms

Adhesion of contamination

Moving contamination

- Impact of air stream

2) Proposed evaluation method

and evaluation criteria

The evaluation method The evaluation criteria

TOTO’s approach

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2. Adhered Contamination Mechanism Confidential

Adhered Contamination Mechanism

contamination

Fiber stub

2. When cleaning the

physical contact

surface, The

contamination

remains behind on the

edge.

1. Contamination is adhered to

PC surface. And Cleaning by

following method.

• Stick

• Connector cleaner

• Air and liquid blast

3. By the air stream generated

by insertion, contamination

is blown and move to the

fiber core center area.

Sleeve

Connector cleaner

c) Insertion d) Extraction

1) Cleaning and Visual

inspection before physical

contact

2) Plug insertion and extraction.

And generating of air stream

3) Contamination

adhere to center

of PC surface

a) Cleaning b) Visual inspection of limited area

Air stream

We assume that the contamination is adhered in above step.

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d) adhesion

Air stream : generated by insertion and extraction Coulomb force : If the electrification is only generated on center of

PC, the direction of coulomb force is toward the

center.

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Adhesive force = Coulomb force + Van der waals force

+Anchor effect

Gravity

Moving force = Air stream +

Coulomb force

If Moving force is lager than Adhesive force,

contamination will be moved. Impact of air steam is

the biggest . 1.E-06 1.E-04 1.E-02 1.E+00

Fad

[N]

Ra[um]

PC surface aria

Confidential

① Adhesive of contamination

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Van der waals force :

-changed by roughness of PC surface.

-when contamination adhered to PC surface, Van

der waals force is minimized. Coulomb force : Under the experiment. Anchor effect : depend on roughness of PC surface.

Adhesive force

Moving force

2. Adhered Contamination Mechanism

Dry cleaning Wet cleaning

Before

cleaning

Contamination

distributed and

adhered

After cleaning

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We have checked that contaminations remain on the edge after cleaning.

Confidential

Even If we uses both type of cleaning methods, Contamination on edge

remains. Current IEC standard allows both contamination conditions

Edge of PC surface

Contamination

Edge of PC surface

Contamination

② The contamination remains on the edge of PC surface

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Split sleeve

The air escape through slit. The slit

width is 200 micron.

→ moderate air stream

Rigid sleeve Split sleeve

Contamination

were adhered

to PC surface

After cleaning

After insertion

and extraction

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Confidential

Rigid sleeve

There is only escape of air in between

plug and sleeve. The Clearance have a

few micron.

→ Strong air stream

③ Contamination are moved by air stream

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The air stream moves adhered contamination to the fiber core area. Air steam

impact is greater with precision sleeve structure.


Contaminations

After insertion and extraction

once

Contaminations

After insertion and extraction

several times

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Confidential 2. Adhered contamination mechanism

Analysis condition

Contamination

mass

3.19 * 10＾-11 kg

Contamination size f30um (ball)

Insertion speed 10 mm/s

Gravity Below

Friction None

Adhesive force None

We could find that the contamination

is moved to center by air stream.

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Confidential

■ Test procedure 1.Prepare the sample.(Method of preparation of the sample is shown on the next page.)

2.Photo the receptacle PC end face at 0,1,2,3,…200 times plug insertion/Extraction.(magnification 200)

3.Check everytime plug. Cleaning if the sample become failed. And, continue the test.

■Criteria

IEC61300-3-44 defects

Explained later.

■Contamination

ISO12103-1 Arizona dust A2

■Atmosphere

Class 9 (ISO14644-1)

Temperature 20-30deg.C, 30-50%RH

■Structure

LC transceiver similar structure

■Plug Cleaning

The sides of cylinder and end face of the plug.

Plug

insertion/extraction

LC connector

LC

receptacle

Lock

rib fixed

Standard adaptor made half

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Evaluation method

1,2,3…..., 50

Cleaning

failed

51, …….. 200

End of

the test


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①Clean the PC end face.

(base on IEC61300-3-44)

②Put the contamination and the

receptacle into the cup.

③Scatter the contamination in the

air-blow from the gap.

PC end face ×200

④Check the PC end face.

(Contamination adheres to the PC

end face)

⑤Cleaning PC end face.

(Use the dry type cleaner)

⑥Check the PC end face.

(Compare a sample of each other)

PC end face ×200 PC end face ×200

Φ4.3mm

3.4

mm

Current &

Socket

Receptacle

Contamination

Air-blow 0.15MPa,5sec

Current & Socket

Receptacle

Jig

Cover with a plastic sheet

Rubber band

Plastic sheet

Dry type cleaner

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Sample preparation method


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Test flow

Make sample

(Contamination Adhered)

Cleaning PC surface

Cleaning by connector cleaner

Insertion and extraction

Check PC surface and

take photo

The number of insertion and

extraction = 200times?

Finish Next sample

The sample become failed?

Failed

No

Pass

Yes

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Evaluation Criteria Description

1 The number of sample which

does not requires cleaning

process

The number of sample which have no

contaminations at critical area during the

in-house evaluation

2 The total number of the

cleaning

The number of cleaning during the

evaluation test.

(Total value of sample 32 pcs and 200

times insertion and extraction.)

3 The Number of the

contamination The number of contamination when the

sample was defined as failed unit

We propose the evaluation criteria below, and we describe “Contamination-

repellant” by using the below Criteria.

Confidential 3. Evaluation methods and criteria

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Confidential

Fiber stub Sleeve

Contamination cleaner Groove

Air stream

We tested using these receptacle.

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To confirm the validity of the evaluation method, We prepared two samples.

The receptacle catch the contamination

by the groove.

c) Insertion d) Extraction a) Cleaning b) Visual inspection


Normal receptacle Cleaning Free ”CF” receptacle

15

Normal CF

The number of

sample which

required no

cleaning

8 pcs

/

32 pcs

18 pcs

/

32 pcs

Pass rate 25% 56%

Diffrencce 31%

There is difference between normal

and CF.

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The number of sample which required no cleaning

N=32

Number of insertion：200 times

Criteria : IEC61300-3-44 defects


0

5

10

15

20

NORMAL CF Th

e n

um

ber

of

no

cle

an

ing

sam

ple

IEC61300-3-44

f 0 – 15 mm

No contamination

f 15 – 115 mm

>10mm None

5-10mm under 3pcs

<5mm allowed

f 115 – 135 mm

All allowance

f 135 – 250 mm

>30mm None

20-30mm under 3pcs

<20mm allowed

16 4DL08214033

Confidential

Normal CF

Contamination

were adhered

to PC surface

After cleaning

by connector

cleaner

After insertion

and extraction

200 times 10 times

failed in IEC appearance

standard

We show the images of PC surface during the test.


Measurement equipment : JDSU Fiber Check

NORMAL CF

The total number

of the cleaning 24 times 14 times

17

42% decrease

There is clear difference between normal and CF.

Confidential

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The total number of the cleaning

N=32




0

5

10

15

20

25

30

NORMAL CF

Th

e n

um

ber

of

cle

an

ing

The total Number of the cleaning

0

2

4

6

8

10

12

14

16

18

20

0 1 2 3 4 5

Nu

nb

er

of

sam

ple

Number of cleaning

NORMAL

CF

No cleaning in

200times insertion

extraction

Distribution of number of cleaning during 200

times insertion and extraction

0

2

4

6

8

10

12

14

16

18

20

0 2 4 6 8 10 12 14 16 18

Nu

mb

er

of

sam

ple

Number of contamination

NORMAL

CF

18

75% decrease

Normal CF

The Number of the

contamination 65 pcs 16 pcs

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The Number of the contamination

when the sample was failed

N=32




0

10

20

30

40

50

60

70

NORMAL CF

Nu

mb

er

of

co

nta

min

ati

on

There is clear difference between The normal and The CF.

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-We have checked that the contamination stay behind on the edge

after cleaning. They move to center during insertion and extraction by

air stream.

-We propose evaluation method and three criteria.

1. The number of sample which require no cleaning

2. The total number of the cleaning

3. The Number of the contamination when the sample was failed -We can find that these criteria showed difference between the normal

and CF receptacle. I think if we use these criteria, we can represent

“Contamination-repellant” function.

5. Conclusion

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Confidential

We believe that the evaluation criteria can show

“Contamination-repellant” function of optical connector. The

fact contribute to contamination problem of operating optical

communication.

Please give me your opinion of our approach.

Copyright © TOTO LTD. All Rights Reserved

Thank you for your listening.

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Confidential

-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

before after

RL

ch

an

ge

[dB

]

対策

-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

before after

RL

ch

an

ge

[dB

]

現行

-0.6 -0.5 -0.4 -0.3 -0.2 -0.1

-1E-15 0.1 0.2 0.3 0.4 0.5 0.6

before after

IL c

ha

ng

e [d

B]

対策

-0.6 -0.5 -0.4 -0.3 -0.2 -0.1

-1E-15 0.1 0.2 0.3 0.4 0.5 0.6

before after

IL c

ha

ng

e [d

B]

現行

TOTO標準の仕様書規格を満足。また現行品とも同等であり問題なし。

RL change ≦±5dB RL change ≦±5dB

RL change ≦±0.5dB RL change ≦±0.5dB

◆信頼性試験結果 1) 振動衝撃試験

試験条件はTOTO標準仕様書(MIL-STD-883,Method2002.4,Method2007.3)に基づく

Appendix

22

-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

before 500h 1000h

RL

ch

an

ge

[dB

]

現行

-0.6 -0.5 -0.4 -0.3 -0.2 -0.1

-1E-15 0.1 0.2 0.3 0.4 0.5 0.6

before 500h 1000h

IL c

ha

ng

e [d

B]

対策

-0.6 -0.5 -0.4 -0.3 -0.2 -0.1

-1E-15 0.1 0.2 0.3 0.4 0.5 0.6

before 500h 1000h

IL c

ha

ng

e [d

B]

現行

-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

before 500h 1000h

RL

ch

an

ge

[dB

]

対策

TOTO標準の仕様書規格を満足。また現行品とも同等であり問題なし。

RL change ≦±5dB RL change ≦±5dB

RL change ≦±0.5dB RL change ≦±0.5dB

Confidential

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◆信頼性試験結果 2) DampHeat試験

試験条件はTOTO標準仕様書(MIL-STD-202, Method103)に基づく

Appendix

23 4DL08214033

Confidential

Sample 1 Sample 2

粉体を付けた初期状態

-2kVの帯電量を与えた後

プラグの挿抜や清掃によって発生する帯電量でPC面のコンタミが移動するとは考え難い

-プラグ挿抜やPC面清掃では発生しないほどの大きな帯電量を与えてもスタブPC

面に付着した異物は動かない

-

-

- - - -

-

-

- - - - -

- -

- - - -

◆帯電によるコンタミの移動への影響調査 -予め粉体をPC面に付着させたスタブに-2kV～で十分帯電させたトレイを被せる

-マイナスの帯電量を与える前後のPC面の状態を比較する

コンタミ表面電位計による参考値 -2kV～

Appendix

4DL08214033 24

0.25mm

0.36mm

0.65mm

◆今回用いたコンタミ付着防止プラグの一例を示す

検査範囲

（IEC61300-3-44）

-PC面に円周状にソケット型を形成する。

-ソケットはエアストリームの流れを変えて運ばれたコンタミをソケット内に取り込む。 -PC面よりも粗いソケット内の表面粗さ（Ra=2um）は、コンタミが付着した際に移動を阻害するキャプチャ効果を見込む。

-ソケット形状を選択することで耐Wiggle性能は現行品と同等にすることができる。

粗さ：Ra=2um

PC Surface

Appendix

Proposal to standardize evaluation and criteria for ...thor.inemi.org/webdownload/2015/OFC_iNEMI_Opto_032315/...Proposal to standardize evaluation and criteria for “contamination

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