Printed Circuit Design & Fab - March 2008 - (Page 27) FIGURE 8. Final package for Tx and Rx with fiber flex array interconnection. FIGURE 7. Waveguide sub-assembly for coupling between lens array imaged components and fibers thru a micro-ferrule. be used to create an “in-situ” mirror when required. Precision alignment of the waveguide film arrays for reflected light coupling on substrates is critical, and is achieved first by precision cutting to locate the waveguides in the film strip. FIGURE 6 shows a 12-guide array precisely aligned to flip chip locating solder balls. Since alignment for each guide is critical (within +/- 3 microns for the example shown) runout or accumulated position error must also be within this range. There are several conductivity issues with this type of waveguide. Alignment of the offsets with included runout over the entire waveguide array must match the part require- ments before assembly. Runout/offset for vertical and horizontal waveguide positions relative to solder balls must be within tolerance for flip-chip component attachment. Care must be taken at assembly to prevent damage that can compromise waveguide and mirror performance. The waveguide film must fit with a uniform and minimum air gap under the flip-chip components. Alignment and waveguide performance must be maintained when subjected to IR solder reflow used for flip-chip attachment. Temperature stability of waveguide films the film’s optical properties must withstand prolonged exposure to temperatures up to 125˚C. In Type Three, the I/O mirror coupling to and from an array of lenses demonstrates the application for a flexible selfsupporting waveguide link that bridges fiber ribbon arrays MARCH 2008 PRINTED CIRCUIT DESIGN & FAB 27 http://www.plasmaetch.com
Table of Contents Feed for the Digital Edition of Printed Circuit Design & Fab - March 2008 Printed Circuit Design & Fab - March 2008 Contents Our Line Market Watch Around the World Happenings ROI EMC for the Real World Positive Plating FPGA/PCB Co-design Increases Fabrication Yields Optoelectronics Comes of Age, Part 2 Implementation of Buried Capacitance in High-Speed Designs Ad Index Improved Innerlayer Bonding for Sequential Lamination Off the Shelf Marketplace BGA Bulletin Printed Circuit Design & Fab - March 2008 Printed Circuit Design & Fab - March 2008 - Printed Circuit Design & Fab - March 2008 (Page Cover1) Printed Circuit Design & Fab - March 2008 - Printed Circuit Design & Fab - March 2008 (Page Cover2) Printed Circuit Design & Fab - March 2008 - Printed Circuit Design & Fab - March 2008 (Page 1) Printed Circuit Design & Fab - March 2008 - Contents (Page 2) Printed Circuit Design & Fab - March 2008 - Contents (Page 3) Printed Circuit Design & Fab - March 2008 - Our Line (Page 4) Printed Circuit Design & Fab - March 2008 - Our Line (Page 5) Printed Circuit Design & Fab - March 2008 - Market Watch (Page 6) Printed Circuit Design & Fab - March 2008 - Market Watch (Page 7) Printed Circuit Design & Fab - March 2008 - Around the World (Page 8) Printed Circuit Design & Fab - March 2008 - Around the World (Page 9) Printed Circuit Design & Fab - March 2008 - Around the World (Page 10) Printed Circuit Design & Fab - March 2008 - Around the World (Page 11) Printed Circuit Design & Fab - March 2008 - Happenings (Page 12) Printed Circuit Design & Fab - March 2008 - Happenings (Page 13) Printed Circuit Design & Fab - March 2008 - ROI (Page 14) Printed Circuit Design & Fab - March 2008 - ROI (Page 15) Printed Circuit Design & Fab - March 2008 - EMC for the Real World (Page 16) Printed Circuit Design & Fab - March 2008 - EMC for the Real World (Page 17) Printed Circuit Design & Fab - March 2008 - Positive Plating (Page 18) Printed Circuit Design & Fab - March 2008 - Positive Plating (Page 19) Printed Circuit Design & Fab - March 2008 - FPGA/PCB Co-design Increases Fabrication Yields (Page 20) Printed Circuit Design & Fab - March 2008 - FPGA/PCB Co-design Increases Fabrication Yields (Page 21) Printed Circuit Design & Fab - March 2008 - FPGA/PCB Co-design Increases Fabrication Yields (Page 22) Printed Circuit Design & Fab - March 2008 - Optoelectronics Comes of Age, Part 2 (Page 23) Printed Circuit Design & Fab - March 2008 - Optoelectronics Comes of Age, Part 2 (Page 24) Printed Circuit Design & Fab - March 2008 - Optoelectronics Comes of Age, Part 2 (Page 25) Printed Circuit Design & Fab - March 2008 - Optoelectronics Comes of Age, Part 2 (Page 26) Printed Circuit Design & Fab - March 2008 - Optoelectronics Comes of Age, Part 2 (Page 27) Printed Circuit Design & Fab - March 2008 - Optoelectronics Comes of Age, Part 2 (Page 28) Printed Circuit Design & Fab - March 2008 - Optoelectronics Comes of Age, Part 2 (Page 29) Printed Circuit Design & Fab - March 2008 - Implementation of Buried Capacitance in High-Speed Designs (Page 30) Printed Circuit Design & Fab - March 2008 - Implementation of Buried Capacitance in High-Speed Designs (Page 31) Printed Circuit Design & Fab - March 2008 - Implementation of Buried Capacitance in High-Speed Designs (Page 32) Printed Circuit Design & Fab - March 2008 - Implementation of Buried Capacitance in High-Speed Designs (Page 33) Printed Circuit Design & Fab - March 2008 - Implementation of Buried Capacitance in High-Speed Designs (Page 34) Printed Circuit Design & Fab - March 2008 - Ad Index (Page 35) Printed Circuit Design & Fab - March 2008 - Improved Innerlayer Bonding for Sequential Lamination (Page 36) Printed Circuit Design & Fab - March 2008 - Improved Innerlayer Bonding for Sequential Lamination (Page 37) Printed Circuit Design & Fab - March 2008 - Improved Innerlayer Bonding for Sequential Lamination (Page 38) Printed Circuit Design & Fab - March 2008 - Improved Innerlayer Bonding for Sequential Lamination (Page 39) Printed Circuit Design & Fab - March 2008 - Improved Innerlayer Bonding for Sequential Lamination (Page 40) Printed Circuit Design & Fab - March 2008 - Improved Innerlayer Bonding for Sequential Lamination (Page 41) Printed Circuit Design & Fab - March 2008 - Off the Shelf (Page 42) Printed Circuit Design & Fab - March 2008 - Off the Shelf (Page 43) Printed Circuit Design & Fab - March 2008 - Marketplace (Page 44) Printed Circuit Design & Fab - March 2008 - Marketplace (Page 45) Printed Circuit Design & Fab - March 2008 - Marketplace (Page 46) Printed Circuit Design & Fab - March 2008 - Marketplace (Page 47) Printed Circuit Design & Fab - March 2008 - BGA Bulletin (Page 48) Printed Circuit Design & Fab - March 2008 - BGA Bulletin (Page Cover3) Printed Circuit Design & Fab - March 2008 - BGA Bulletin (Page Cover4)
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