connectingintegrated optical systems ... · 1 connectingintegrated optical systems...
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Connecting Integrated Optical Systems Novel Connectors for Future Applications
Dr. Markus Michler
Workshop on „Connectors for Advanced Fiber Systems“ of Swissphotonics and Diamond SA
Losone 26.06.2014
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Chur
St.Gallen
Buchs
Who we are ...
NTB Buchs
Institute for Micro- andNanotechnology
Photonics group
Prof. Dr. Markus Michler
M.Sc. Klaus Dietrich
M.Sc. David Bischof
M.Sc. Johannes Kremmel
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What we do ...
... where microtechnology meets optics
• Fiber Optics
• Integrated Optics
• MOEMS
• Thin Film Optics
• Simulation (ray tracing / physical optics / thin films)
EOCB technology
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The EOCB concept ...
© vario-optics ag
EOCB = electro-optical circuit board
• Multimode waveguide technology
• Thin glass or polymer waveguides
• WGs in inner layers (laminated)
• Multilayer boards optical/electrical
• Different WG pitch possible(62,5μm / 125μm / 250μm)
Thin Glas WG for Optical Printed Circuit Boards © Frauenhofer IZM
Polymer Waveguides 50x50μm embedded in PCB © vario-optics ag
© DANGEL et al.: Polymer Waveguide based board level optical interconnect technology for datacom applications (2008)
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... and where connector solutions are needed (I)
Transceiver (TX) / Receiver (RX) coupling
• Fixed / reworkable connection
• Small optical tolerances (~μm)
• Active / machine visionalignment possible
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... and where connector solutions are needed (II)
Board to board coupling: (e.g. daughter card to backplane)
• Optical AND electrical connectors
• detachable connection
• big mechanical tolerances (~mm)
© IBM – Optical Interconnects – Intra system data transferwith light (2005)
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Deflection coupling – NeGIT- pin
Erni / Frauenhofer IZM, et al. in Proc. of SPIE Vol. 6124 612407 (2006)
NeGIT- pin
Tx / Rx Modul
board to board coupling
• 90° mirror reflection (kind of butt coupling)
• MM waveguides ray-tracing simulation
• ca. 1.5dB losses @ ~5μm tolerances
• Rx/Tx coupling & board to board coupling
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Deflection coupling – lens / mirror combinations
Erni / Frauenhofer IZM, et al. in Electronic Comp. and Techn. Conf. / IEEE 2008
• Passive element using TIR and lenses
• high refractive index glass with n > 1.8
• Parallel beam optics inside
• multilayer waveguides can be connected
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Deflection coupling – integrated mirror device
vario optics – OFC 2014 / CTI event 2014
• Mirror device with beam-shaping
• Metallized injection moulded parts
• Integrated in waveguide layer
• Integrated in EOCB production flow
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Butt coupling at the facet
IBM / DANGEL et al.: “Polymer Waveguide based board level optical interconnect technology for datacom applications” (2008)
• Milling of PCB – butt coupling to WG facet
• Integrated passive alignment structures for MT pin adaptors
• Direct coupling of Rx / Tx modules
• Direct coupling to MT connector for board to board coupling
MT compatible pins
Board to board Tx / Rx to board
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Flexible waveguide coupling - FlexTail
Tyco Electronics / vario-optics: „All optical pluggable board-backplane interconnection system based on an MPXTM-FlexTail connector solution” (2010)
• FlexTails = flexible out-of-plane coupling bridges for the polymer WGs
• FlexTails terminated with modified MT based fiber ferrules
• pluggable coupling solution based on MPXTM multi fiber connectors
• Tolerance staging (3mm300μm3μm)
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What we think is best for Rx/Tx coupling
Deflection coupling / 90° coupling
• Optical Pad: VCSEL-arrays (Tx) and diode arrays (Rx) mounted on EOCB top layer using a receptacle (not directly soldered or glued)
• Active alignment (not preferred) or vision based alignment possible
• Deflection element doesn‘t have to be reworkable
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What we think is best for board to board coupling
• Management of mechanical tolerances
• FlexTail type / butt coupling concept to minimize losses
• Daughter card with MT compatible connector
MT compatible
connector manages mechanical tolerances
FlexTail type or butt coupling
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Requirements for board to board coupling
Opto-mechanical interface
Channel spacing: pitch 125µm (250µm)Number of waveguides: 12 (per row) [ 48 / 96 multi row]Space requirements: total waveguide width +4mm
Thermal stability Ferrule has to withstand reflow (4x) / lamination
Optical coupling losses ≤ 0.9 dB (waveguide to waveguide)
Tolerances: relative deviation between the two boards to be coupled
To be definedassumption: ±0.2mm in all three dimensions defined by
the electrical connector
Compensation of mechanical tolerances
Integrated in the optical connector passive alignment required
Mechanical dimensions
Minimum line-card spacing: 15mmSpace requirement on line card: ca. 15mm (distance between line-card and backplane: ca.10mm)
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Connectors and EOCB production flow
Connector concepts have to be realized close together with EOCB manufacturer and assembler due to the EOCB production flow
Temperature load / pressure during lamination or reflow
Machining (e.g. milling) of processed boards is critical
Facet preparation
Ferrule mounting
Optical layer manufacturing
Lamination Temp. & pressure
Assembly Reflow Temperature
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Thanks a lot for your attention
I am ready for open questions
NTB Interstaatliche Hochschule für Technik Buchs
Campus Buchs Campus St. Gallen HTW Chur (Kooperationspartner)
9471 Buchs 9013 St. Gallen 7004 [email protected] www.ntb.ch www.htwchur.ch
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Deflection coupling – The FCI patent (lens & TIR)
FCI - Patent Application WO 2012/017318 A2
• Lens - TIR - lens combination
• Collimated beam optics inside
• Light guided parallel outside the board or deflected by 90°
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Deflection coupling – prizm connector
USCONEC / Avago Technologies
PRIZM® LightTurn® Connector
• TIR (total internal reflection) lens• Integrated alignment pins• Housing protects TIR lens array• Collimated light at optical interface
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Flexible waveguide coupling - FiberGate
Huber+Suhner / vario-optics: „960 Gb/s Optical Backplane Ecosystem Using Embedded Polymer Waveguides and Demonstration in a 12G SAS Storage Array” (2013)
• System similar to FlexTrail
• FiberGate connectors instead of MPXTM