Goosey, M

Selviah, DR

English

UCL Discovery

Polymer Multimode Waveguide Optical and Electronic PCB ManufacturingDavid R. SelviahDepartment of Electronic and Electrical Engineering,University College London, UCL, UK, d.selviah@ee.ucl.ac.uk© UCL 2009 1Copper Tracks versus Optical Waveguides for High Bit Rate Interconnects• Copper Track– EMI Crosstalk– Loss – Impedance control to minimize back reflections, additional equalisation, costly board material• Optical Waveguides– Low loss– Low cost– Low power consumption– Low crosstalk– Low clock skew– WDM gives higher aggregate bit rate– Cannot transmit electrical power2 © UCL 2009Optical and ElectronicInterconnectsBackplaneMezzanine Board (DaughterBoard, Line Card)Optical Connector3NPLPhysical measurementsEnd UsersXyratexNetwork storageinterconnectBAE SystemsIn-flight interconnectRenishawPrecisionmeasurementLoughborough UniversityLaser ablation andink-jet printingof waveguidesCadencePCB designtools and rulesExxelisPolymer supply and photolithographyHeriot-Watt UniversityPolymer formulationSupply of laser written waveguidesStevenage Circuits LtdSample PCBs, dry filmCAD conversion, laser workUCLOptical modellingWaveguide design rulesOptical measurementsNPLPhysical MeasurementsDow CorningPolymer supply and photolithography© UCL 20094 Backplanes Butt connection of “plug-in” daughter cards In-plane interconnection Focus of OPCB projectMultilayer organic substrateCoreCladdingVCSELDaughter cardDetectorDaughter card© UCL 2009The IeMRC Optical Printed Circuit Board (OPCB) Project Final Aims1. To investigate and compare several waveguide fabrication techniques, including Photolithography, Direct Laser Write, and Ink Jet Printing2. To investigate and compare different polymers, including Polysiloxane and Acrylate/Methacrylate3. To establish waveguide design rules and use with commercial PCB layout software to design a demonstrator4. To investigate waveguides sidewall roughness by experiment and modellingSelected Achievements• Heriot Watt’s original acrylate/methacrylate formulation required a writing speed of ~75 µm/s at a power of ~100 µW. They formulated a new polymer which cures at a much faster writing speed of 100 mm/s at a reduced power of 8 mW• Loughborough University have demonstrated the inkjet printing of polymer waveguide materials and fabricated trial polysiloxane waveguides using this technique.• UCL characterised the waveguide wall roughness for the first time and derived a new theory to calculate the propagation loss due to sidewall scattering in press in IEEE Journal of Lightwave Technology.• UCL made the first measurements of crosstalk between waveguides published in IEEE Transactions on Advanced Packaging.• UCL established design rules for lowest loss for bend radius, crossing angles, waveguide spacing and used them with Cadence PCB layout tools to design a demonstrator backplane totally connecting 4 daughter cards which was fabricated and proved to work well – the first ever such demonstration© UCL 2009Optical PCB BackplaneLayout designFabricated PCB

The Innovative Electronics Manufacturing Research Centre and its PCB Focused Projects

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UCL Discovery