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Optical Hybrids

Optical Hybrids. WBS 1.1.1.4. K.K. Gan The Ohio State University. Outline. l Introduction l Opto-package prototypes l Opto-hybrid board design l Cost and schedule summary l Conclusions. ATLAS Pixel Opto-link. Opto-package. l 2 fibres + VCSEL + PIN

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Optical Hybrids

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  1. Optical Hybrids WBS 1.1.1.4 K.K. Gan The Ohio State University US ATLAS Review

  2. Outline lIntroduction lOpto-package prototypes lOpto-hybrid board design lCost and schedule summary lConclusions US ATLAS Review

  3. ATLAS Pixel Opto-link US ATLAS Review

  4. Opto-package l2 fibres + VCSEL + PIN lcoupled VCSEL power > 300 mW @ 10 mA lVCSEL tolerance: l50 mm in z (along fibre) l25 mm in r (transverse to fibre) US ATLAS Review

  5. Opto-package Designs lMarconi P8 silicon/alumina pieces Puse silicon mirror for 450 light reflection Phigh cost lTaiwan P3 G-10 pieces Pcleave fibre at 450 Pfibers permanently attached: need voliton connector Plow cost lOSU P2 pieces Pcap with fibers can be attached to package at end of module assembly Plow cost US ATLAS Review

  6. OSU Design lconnector concept design Puse precisely fabricated cap and base for alignment Psimple two-piece design for mass production and cost reduction lcap P2 holes for fibers lbase Pdeposit gold traces for wire bonding, VCSEL and PIN placements US ATLAS Review

  7. Base and Cap US ATLAS Review

  8. Cap and Base Prototypes lproduced caps and bases (rounded corners) using machinable ceramic Pmaterial tested: aluminum silicate and macor Pdifficult to obtain consistent precision _redesign base with square corners for ease of fabrication by Hybrid-Tek Palumina sheet ground to proper thickness and cut into strips Phave produced bases with precision within specification P3D traces have good connectivity _fabricate cap with Ultem (polyetherimide) for radiation tolerance (10 Grad) Puse manual micro mold injection to save development time Pcan fabricate several quality caps per hour US ATLAS Review

  9. Prototype Result lproduced 10 packages lVCSELs have fast rise and fall time: < 1 ns lPINs have good responsitivity: 0.5 A/W lcoupled power > 300 mW in both VCSELs simultaneously for 8 packages with different combinations of bases and caps _demonstrated feasibility of fabricating high precision caps and bases lno cross-talk between VCSEL and PIN above 20 mA US ATLAS Review

  10. Cap with Precisely Fabricated Cavity US ATLAS Review

  11. Base with PIN and VCSELs US ATLAS Review

  12. Completed Opto-package US ATLAS Review

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  14. no cross talk above 20 mA US ATLAS Review

  15. Summary on Opto-package lprinciple of two-piece connector concept demonstrated Pprecision bases with 3D traces of good connectivity fabricated Pprecision caps fabricated _packages produce optical power above specification _negligible cross-talk between VCSEL and PIN lability to produce precise die placement jig is a concern P required six trials (one week) for current jig US ATLAS Review

  16. Opto-hybrid Board lconvert optical signal into electrical signal and vice verse lcontains 6 sets of opto-pack, VDC, and DORIC lelectrical signal to/from module channel through 60-pin connector llayout to serve 7 modules is ready Pwill convert to serve 6 modules Pfirst submission will use FR-4 for cost saving P2nd and 3rd prototypes will use BeO lboard is compatible with Taiwan opto-pack US ATLAS Review

  17. Opto-hybrid US ATLAS Review

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  20. Conclusions lprinciple of fabrication of opto-pack demonstrated lno major technical challenge in opto-hybrid board fabrication Pcompatible with Taiwan opto-pack Pexperience in opto-pack prototyping is very useful for mounting opto-packs on opto-hybrid board US ATLAS Review

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