Embedded Polymer Waveguide to Optical Fiber Interconnects Creating the Optimal Link Dr. Blanca Ruiz , Marika Immonen, Dr. Andres Ferrer, Christian Gsell, Dr. Peter Cristea CTI – Corporate Technology & Innovation Reichle & De Massari AG Wetzikon, Switzerland
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Embedded Polymer Waveguide to Optical Fiber Interconnectsl3matrix.eu/wp-content/uploads/2017/10/Embedded... · On-Board Optics & Collaboration Project RDM-TTM 4 Addressed WG • Polymer
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Embedded Polymer Waveguide to Optical Fiber
InterconnectsCreating the Optimal Link
Dr. Blanca Ruiz, Marika Immonen, Dr. Andres Ferrer, Christian Gsell, Dr. Peter
Mechanical stability an issue for repeated mattings
Alignment Tolerance for Rectangular Cross Section WG
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
-20 -15 -10 -5 0 5 10 15 20Tota
l In
sert
ion
Lo
ss p
er
Co
nn
ect
or
(dB
)
Displacement (µm)
Effect of WG-Fiber Missalignment
Rectangular CrossSection WG
R&M Specs
• Excess loss < 0.5 dB in all channels
• Mating cycles > 20
• Transferable process for assembly
house
• Connector able to withstand
soldering
Requires
• Lateral Alignment Tolerance < 5 µm
• XYZ translations
• 3 Angle tolerances accumulate
• Fiber array eccentricity 3 µm
• WG array eccentricity 3 µm
• Physical Contact
• Heat resistance materials
Very Challenging for
Passive Alignment!
• Cross section mismatch penalty:
~ 0.5 dB
• WG end face quality factors: polish,
perpendicularity
R&M Approach
▪ Active alignment of reference pins to board
• 6 degrees of freedom
alignment
• Pins cured into position
FR4
WG core MT pin
▪ Connector Design
Standard force for an MPO connector is ~ 2N per fiber
– Modified adapter
protects waveguide front face from plastic deformation or
fractures within waveguide core due to stress
Equalizes the ferrule force upon the edge of the board
Controls contact angle
Ensures physical contact Patent Pending
Next steps:
External footprint reduction
Further automation of assembly
▪ Assembly Process
– Tools and process developed at R&M
– Transferable to assembly house
Passive Waveguide Backplane Evaluation Card
Optical port
(12-ch…48-ch)
Optical port
Optical portOptical port
Optical electrical PCB
Parallel waveguides
Pluggable MPO interface
Optical port
(12-ch…48-ch)
Ch1 Ch2 Ch3 Ch4 Ch5 Ch6
Results
• Measured with EF
• Referenced vs single
channel basis
• Includes losses of 1
MPO cable
0
5
10
15
20
25
1 2 3 4 5 6 7 8 9 10 11 12
TIL
(dB
)
Ch number
Effect of mating cycles (1 to 100)Mating Nr 0Mating nr 1Mating nr 2Mating nr 3Mating nr 4Mating nr 5Mating nr 6Mating nr 7Mating nr 8Mating nr 9Mating nr 10Mating nr 11Mating nr 12Mating nr 13Mating nr 14Mating nr 15Mating nr 16Mating nr 17Mating nr 18Mating nr 19Mating nr 20Mating nr 25Mating nr 30Mating nr 35Mating nr 40Mating nr 50Mating nr 60Mating nr 70Mating nr 80Mating nr 90Mating nr 100
0
0.2
0.4
0.6
0.8
1
1 2 3 4 5 6 7 8 9 10 11 12
Inse
rtio
n L
oss
(d
B)
Channel
Connector Losses vs Reference
Average loss = 0.57 dB
σ = 0.14 dB
Embedded Waveguide PCBs for On-Board Optics
▪ Passive backplane with 60 polymer waveguides in port/to/port 12-ch links
▪ All WG channels terminated by RdM’sWG connectors