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3745

VIEWS: 8 PAGES: 12

  • pg 1
									                     Interconnect Solutions for the
                             Optical Backplane Era

                                  Richard C. A. Pitwon
                               Senior Photonics Engineer

ECOC 2005, Glasgow
September ’05
      Photonics Research & Development Showcase


        Overview



          High Speed Parallel       Optical Backplane           Optical Waveguide
          Optical Transceiver          Connector            Interface Coupling Method




        Novel Mechano-Photonic   High Precision Waveguide       Proof-of-Concept
           Interface Design         Alignment Method            Demonstrator Rig




2   ECOC 2005 | Richard Pitwon
      Parallel Optical Transceiver


        Overview                        Quad Parallel Optical
                                           Transceiver

        Optical Transceiver Circuit

                                         10 Gb/s per duplex
                                              channel




                                            Daughtercard
       Output Signal Characterisation
                                             Pluggable
                @ 10.3 Gb/s




           Jitter         ~30 ps        Flexible Laminate PCB




                                         Mechano-Photonic
                                         Coupling Interface




                                            Patent Filed




3   ECOC 2005 | Richard Pitwon
      Photonic Interface


        Overview

        Optical Transceiver Circuit                  Raw Die Bond Wire
                                                        Attachment

        Mechano-Photonic Interface




                                                     Custom GRIN Lens
                                                          Holder
                                        1x4 VCSEL
                                          Array
                                                    High Precision Visual
        Source: ULM Photonics GmbH                   Alignment of GRIN
                                                    Lens Array to Active
                                                           Areas
                                         1x4 PIN
                                          Array

        Source: Microsemi Corporation
                                                    Mechanical Alignment
                                                        Structures
                                        1x12 GRIN
                                        Microlens
                                          Array      Multi-Terminal (MT)
                                                         Compliant
        Source: GRINTech GmbH




4   ECOC 2005 | Richard Pitwon
      Connector Mechanism


        Overview
                                        Metallic Housing

        Optical Transceiver Circuit

                                          Daughtercard
        Mechano-Photonic Interface         Pluggable


        Optical PCB Connector

                                      Cam Lever Mechanism




                                        Coarse Alignment
                                          Mechanism



                                        Primary Function:

                                          Elevation and
                                      Retraction of Photonic
                                             Interface




5   ECOC 2005 | Richard Pitwon
      Waveguide Alignment Method


        Overview                       Low Cost Precision
                                        Assembly Method

        Optical Transceiver Circuit

                                        Lithographically
        Mechano-Photonic Interface    Patterned Mechanical
                                       Alignment Features
        Optical PCB Connector

        Waveguide Alignment Method     Multi-Terminal (MT)
                                      Compliant Receptacle




                                      Accuracy measured to
                                         within +/- 3 µm



                                      Successful Coupling of
                                        Mechano-Photonic
                                        Interface to Optical
                                                PCB




        www.exxelis.com


6   ECOC 2005 | Richard Pitwon
      Optical Backplane Engagement




7   ECOC 2005 | Richard Pitwon
      Prototype Demonstrator


        Overview                           2 Pluggable      Polymer Waveguide
                                                                                Passive Electrical
                                        Daughtercards and       Optical PCB
                                                                                   Backplane
                                           Connectors         Length: 10 cm
        Optical Transceiver Circuit

        Mechano-Photonic Interface

        Optical PCB Connector

        Waveguide Alignment Method


        Proof-of-Concept Demonstrator




8   ECOC 2005 | Richard Pitwon
      Test and Characterisation


        Overview                               Characterisation of Optical Connector
                                               Coupling to Waveguide with 10.3 Gb/s
                                               850 nm Optical Signal
        Optical Transceiver Circuit

        Mechano-Photonic Interface
                                               Reference Signal – No Waveguide

        Optical PCB Connector                  Jitter                       0.34 UI
                                               Relative Loss                0 dB

        Waveguide Alignment Method
                                               10 cm Waveguide with Isapropanol

        Proof-of-Concept Demonstrator          Jitter                       0.36 UI
                                               Relative Loss                4.5 dB

        Test & Characterisation
                                               10 cm Waveguide – Diced and Polished

                                               Jitter                       0.56 UI
          Driven with 10 GbE LAN (10.3 Gb/s)   Relative Loss                6.9 dB
                         traffic

                                               10 cm Waveguide – Diced Only
         Passed 4 hour
        soak test with no                      Jitter                       0.89 UI
             errors                            Relative Loss                7.9 dB




9   ECOC 2005 | Richard Pitwon
      Exposition


        Overview                        Demonstrator Exhibition Sites:

                                        • ECOC 2005, Glasgow
        Optical Transceiver Circuit     • Photonex 2005, Stoneleigh, Coventry


        Mechano-Photonic Interface

        Optical PCB Connector

        Waveguide Alignment Method


        Proof-of-Concept Demonstrator


        Test & Characterisation


        Exposition




10   ECOC 2005 | Richard Pitwon
      Acknowledgments


        Overview                            Optical Waveguide Fabrication:
                                                        Navin Suyal
        Optical Transceiver Circuit
                                                        Exxelis Ltd
        Mechano-Photonic Interface      Kelvin Campus, West of Scotland Science Park
                                                    Glasgow, G20 0TH

        Optical PCB Connector                        www.exxelis.com

        Waveguide Alignment Method
                                         Polymer Waveguide Characterisation:
                                                 Ioannis Papakonstantinou
        Proof-of-Concept Demonstrator                David R. Selviah

                                             Optical Systems and Devices Group
        Test & Characterisation                             UCL
                                                          London
        Exposition


        Acknowledgments                             Special Thanks to
                                             Frank Tooley (Photonix, Glasgow),
                                                      EPSRC and DTI




11   ECOC 2005 | Richard Pitwon
         Thank You for Your
         Attention!



        Richard C. A. Pitwon        Xyratex Team
        Senior Photonics Engineer
                                    Steve Thompson   CTO
        rpitwon@xyratex.com         Dave Milward     Project Manager
                                    Ken Hopkins      Hardware Architect


        Xyratex
        Hampshire P09 1SA
        United Kingdom

        www.xyratex.com




12   ECOC 2005 | Richard Pitwon

								
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