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iNEMI Confidential
for member organization use only
Design and Performance of
PRIZM®LightTurn® Connector Cleaner
Jillcha Wakjira
Toshiaki Satake
Masaru Kobayashi
Masayuki Murakami
Mar 5, 2012
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Presentation Outline
1. Background
Application
PRIZM® LightTurn® Ferrule
Ferrule Cleaning Requirements
Light From Fiber Vs. Light From RIZM®LightTurn®Ferrule
2. Cleaning Cassette Design Overview
Exit Window Inspection Requirements
Design and operation
3. Performance evaluation
Testing method and results
4. Conclusions
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1 Background, PRIZM®LightTurn
® Application
• Traditional MPO based parallel optic modules required too much
space for dense embedded optic architectures and were too expensive
• Development of optical photonic turn connectors facilitate:
• Smaller and lower cost modules
• Higher density optical connectivity at the card edge
• No polish and low cost termination
• Removable, multi-fiber connector interface for next generation
small form factor parallel optical module
Figure 1: MPO Vs. Prizm Module Figure 2: Light From Prizm to
Module Interface
Figure 3: MPO Module Vs. 4 Prizm
Conn./ Interface Assembly
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Fiber Ribbon
Exit Window
Toe Guide
Pin
Heel Guide
Pin
Lens
Array
Figure 4: PRIZM®LightTurn
® Top View • Light (850nm) travels through the plastic
and bends 90º coming out through the exit
window.
• Defects on the lens array or the exit
window can deteriorate transmission
power.
• The guide pins allow precise positioning
of the lens array to the receiver module.
Figure 5: PRIZM®LightTurn
® Rear View
1 Background, Ferrule Design
Figure MT: Light From MT
Ferrule
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1 Background, Ferrule Housing
Figure 6: Ferrule housing for bare
ribbon assembly
Figure 7: Ferrule housing for round
cable assembly
Bend Limiter
• Two types of hardware
• Cover for ribbon cable
• Cover for round cable (Ø1.8mm)
• Housings cover:
• Protects lens array
• Provides latching mechanism to
receiver module assembly
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1 Background, Light From Fiber Vs. Light From PRIZM®LightTurn® Ferrule
5
• At the exit window, the light spot diameter is 180µm.
• PRIZM exit spot area is 13X larger than fiber exit spot
• PRIZM is less sensitive to defects
• Inspection requirements are less stringent
50µm fiber
spot
180µm
PRIZM
spot
Figure 8: Light spot size from 50µm core
fiber @ 300X Magnification
Figure 9: Light spot size from PRIZM
@ 300X Magnification
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2 Design Overview, Exit Window Inspection Requirements
Allowable Defects Allowable Scratches
• ≤ 700 µm2 cumulative area per exit
window lens outline (equivalent to ≤ 30
µm diameter circle)
• Defects <5µm diameter are acceptable
and are not included in the cumulative
diameter
• ≤12 µm scratch width
• No limit on scratch length
• Total of 1 scratch allowed per exit window lens
outline
• Scratches <5µm width are acceptable and are not
included in the cumulative number of scratches
• The PRIZM ferrule losses were measured, under various “defect” conditions to determine performance specifications for the ferrule exit window.
Table 1: PRIZM Exit Window Inspection Requirement
Figure 10: Sample image of two minor scratches
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2 Design Overview, Exit Window Inspection Requirements
• Small scratches (<5µm)
don’t matter
7
Channels with no scratches Channels with 2-5 scratches
Channel count 84 57
Average Loss (dB) 1.36 1.37
Max Loss (dB) 1.95 1.79
Standard Dev 0.22 0.21
Coefficient of Variation 16% 16%
T-test showed statistical significance at a 1% level
0
2
4
6
8
10
12
0.9 0.95 1 1.05 1.1 1.15 1.2 1.25 1.3 1.35 1.4 1.45 1.5 1.55 1.6 1.65 1.7 1.75 1.8 1.85 1.9 1.95 2
Loss (dB)
non-zero
zero
Table 2: Test Summary of 15 jumpers with <5 um scratches
Figure 11: Loss distribution on Channels <5µm scratches
# o
f C
ha
nn
els
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2 Design Overview, Design And Operation
Figure 13: Changeable Cartridge
Actuating Arm
Holding Arm
Shutter Connector
seating area
• Actuating Arm advances fabric
• Holding Arm holds connector in
place
• Connector seating area aligns
ferrule with cleaning fabric
• Shutter protects fabric from
debris
• Changeable Cartridge allows for
easy replacement of fabric
Figure 12: Prizm Cleaner
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2 Design Overview, Design And Operation
• Cleaner works with both ribbon and
round hardware
• Connectors can be installed either on
the left or right side of the cleaner
• Saddle is spring loaded so as to control
the amount of force the fabric exerts on
the cleaner
• The rounded tip on the “Holding Arm”
helps center the connector
Saddle
Figure 14: Seated Ribbon Connector
Figure 15: Seated Round Connector
Figure 16: Disassembled Cartridge
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3 Performance evaluation
SPECIFICATION PROCEDURE REQUIREMENT
Cleaning A Clean ferrule Clean a pristine ferrule the entire length of a cartridge.
Monitor for damage every 25, 50, 100, 200, 400, 800, end of cloth
PRIZM® LightTurn® Visual Inspection Acceptance
Criteria AEN-1413, Section 5.1
Contamination
Arizona road dust
Dryer lint
Skin oil
Durability
● Cycle cleaner for 400 cycles. Verify effectiveness of cleaner after 400 cycles (Arizona dust ).
● Cycle cleaner for 800 cycles and verify effectiveness of cleaner at the end (Arizona dust ).
Cartridge Life Cycle Count number of cycles. >800
Table 3: Summary of Cleaner Tests
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Arizona Road Dust Contamination Test
before
contamination
after contamination
with Arizona road dust
after 1st cleaning
after 2nd cleaning
Figure 17: Exit Window End View
Figure 18: Exit Window End View
Figure 19: Exit Window End View
Figure 20: Exit Window End View
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Dryer Lint Contamination Tests
before
contamination
after contamination
with dryer lint
after 1st cleaning
after 2nd cleaning
Figure 21: Exit Window End View
Figure 22: Exit Window End View
Figure 23: Exit Window End View
Figure 24: Exit Window End View
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3 Performance evaluation
Skin Oil Contamination Tests
before contamination
after contamination
with Skin Oil
after 1st cleaning
after 2nd cleaning
Figure 25: Exit Window End View
Figure 26: Exit Window End View
Figure 27: Exit Window End View
Figure 28: Exit Window End View
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4 Conclusions
• Developed a cleaning tool for the PRIZM®LightTurn
®
Connector.
• Cleaner does not induce scratch when cleaning dust, lint
or oil.
• Cleaner was designed to clean on one click, sometimes a
2nd pass is required
• Will continue to optimize cleaner to minimize need for a
2nd cleaning pass.
iNEMI Confidential
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• Jillcha Wakjira
• Toshiaki Satake
• Masaru Kobayashi
• Masayuki Murakami
