DPF 2013 R. Kass 1 P. Buchholz, M. Ziolkowski Universität Siegen OUTLINE Lessons learned… IBL/nSQP opto-board overview assembly experience radiation hardness.

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DPF 2013 R. Kass 1 P. Buchholz, M. Ziolkowski Universität Siegen OUTLINE Lessons learned… IBL/nSQP opto-board overview assembly experience radiation hardness production Summary/Conclusions K.K. Gan, H.P. Kagan, R.D. Kass, J. Moss, J. Moore, S. Smith, Y. Yang The Ohio State University

DPF 2013 R. Kass 2 Optical data transmission preferred over copper wire links: optical fibers are lower in mass than copper higher data transmission rate over long distances (80m) no ground loop between front and back end electronics Optical Transmitter: VCSEL ( vertical cavity surface-emitting laser) Optical Receiver: PIN diode Can be packaged in one, four, twelve channels Work in the radiation environment of the LHC ~1.85m ~80m optoboard ~1m VCSEL: Vertical Cavity Surface Emitting Laser diode VDC: VCSEL Driver Circuit PIN: PiN diode DORIC: Digital Optical Receiver Integrated Circuit

DPF 2013 R. Kass IEEE04/Rome 3 The pre-IBL Opto-board Optical signal  electrical signal conversion occurs here Contains 7 optical links, each link serving one Pixel module Fabricated in 2 flavors – Layer B: for inner barrel, 2 data links per module for high occupancy – Layer D: for outer barrel and disks 1 and 2 Fabricated with BeO for heat management 44 B boards 228 D boards Opto-pack Housing Pin array DORIC VCSEL array VDC

DPF 2013 On opto-boards, only 1 confirmed VCSEL death (connected but not lasing) We were saved by the low humidity environment There are some weak links (besides the VCSELs) we have addressed on the new opto-boards Single Iset line (pin) per board Added a redundant pin to the 80/100 pin connector (nSQP/IBL) Soldering of opto-packs  Suspect 15 VCSEL and 6 PIN failures due to cold solder joints New Opto-pack connections are wire bonded DORIC reset daisy chain  Some DORIC channels/modules hard to configure have a  broken reset line Added an redundant pin on the 80 pin connector Improved routing so no more daisy chaining through chips Pixel Opto-board Lessons

DPF 2013 Use same 0.25 µm DORIC /VDC ASIC chips as present pixel opto-boards Use copper+Polyimide instead of BeO for the PCB Switch to industry standard MTP fiber connector and OSU opto-pack Switch to fully qualified Finisar VCSEL and ULM PIN arrays Finisar V ULMPIN-04-TN-U0112U nSQP: 2 flavors of opto-boards (for legacy fiber mapping) – B-Layer – D-Tall – All equipped with 14 DTO / 7 TTC ( enables operation at higher rates ) IBL: 1 flavor of opto-board – 16 DTO / 8 TTC IBL/nSQP Opto-board Overview 5 DTO: data output signal TTC: timing, trigger, control signal

DPF 2013 nSQP/IBL Opto-Board Prototyping We have constructed 10 nSQP B-boards 5 for irradiation 5 for system tests (2 to CERN 1 to SLAC, 1 to BERN, 1 to Wuppertal) 6 nSQP D-boards All for system tests (4 to CERN) 2 failed QA 1 with bad wire-bonds 1 with a bad DORIC (slipped through test in 2005) 6 IBL boards All for system tests (5 to CERN, 1 to SLAC) No complaints received on distributed boards 6

DPF μ m DORIC and VDC ASICs well exercised Dedicated ASIC irradiation to 61 Mrad (2003) 4 production opto-boards to 30 Mrad (2004) 10 opto-boards to 30 Mrad for VCSEL/PIN SEU R&D (2006-9) VCSEL/PIN qualified Opto-boards exercised Constructed 6 nSQP B-Layer boards in July 2011 Used Finisar 5Gb/s VCSELs and ULM PINs on OSU Opto-packs Irradiated 2 sets of 2 boards with 24 GeV CERN First set 8x10 13 p/cm 2  1.8 Mrad (18 KGy) Second set 10.4x10 13 p/cm 2  2.3 Mrad (23 KGy) Test successful: No failed channels, PIN current thresholds for no bit errors remained constant, modest decrease in output optical power, boards fully functional after irradiation Since IBL board of identical construction, no need to repeat Opto-board Radiation Hardness 7

DPF 2013 nSQP B-Layer Irradiation Modest degradation in VCSEL output power Mrad 2.3 Mrad

DPF 2013 IBL/nSQP Opto-boards Mounting of passive components (outside vendor) Electrical open/short test 30 mm x 46 mm PCB 6-layer board Use copper for thermal management 9 Component side passive components mounted by vender Everything else mounted at Ohio State Backside 1mm thick copper backing plate slides into cooling rail

DPF 2013 Opto-Pack Production 10 Substrate BeO for VCSELs (thermal management) Alumina for PINs Opto-pack holds a VCSEL or PIN array Alignment of fiber to PIN/VCSEL is critical “bare” opto-pack and guide pins gluing guide pins into opto-pack opto-pack with guide pins

DPF 2013 Opto-Pack Production 11 dust cover installed wire bonding to PIN/VCSEL wire bonded PIN/VCSEL array PIN/VCSEL array glued to opto-pack Produce opto-packs (2 VCSEL, 1 PIN per opto-board) PIN/VCSEL array must be put on Opto-pack & connected to traces VCSEL QA: LIV, reverse bias looking for ESD PIN QA: dark current, illuminate with 1mW & measure responsivity, check specs

DPF 2013 R. Kass 12 Wire bonding chips to board, board to opto-packs Opto-board Production Procedure Mounting of opto-packs Encapsulation of wire bonds Mounting of optical connectors Mounting of DORIC & VDC

DPF 2013 R. Kass 13 Go/No Go Test check optical power, all channels error free Burn in: 50° C, powered Thermal cycling: 0° C -> + 50° C, 10 cycles, 2hrs per cycle Full electrical and optical QA at 10° C error free for 1 hr at 10° C (data at 40 Mbits) measure optical power at 0, 10, 10, 50° C check LVDS, jitter, rise/fall time, duty cycle Opto-board Q/A Procedure Send to CERN Reception Test at CERN Go/No Go Test Install PINs VCSELs spec

DPF 2013 R. Kass 14 Completed Opto-board PIN cooling from here (top rail) VCSEL MTP Fiber Connector opto-pack VDC DORIC 30 mm

DPF 2013 IBL/nSQP Opto-board Summary 15 We have been in production for ~ 3 months Expect to finish production late fall. neededcompletedStatus nSQP B-layer4455Done nSQP D-Tall22837Waiting for PCBs IBL286In progress

DPF 2013 R. Kass 16 Extra Slides

DPF 2013 R. Kass IEEE04/Rome 17 Rise/Fall times, Jitter, and Duty Cycle Each plot shows the results for two opto-boards No degradation in rise/fall times Decoded clock duty cycle and jitter within the limits after irradiation Optical rise time decoded clock (LVDS) duty cycle Optical fall time decoded clock (LVDS) Jitter After irrad Before irrad

DPF 2013 Delivered and setup a copy of the QA system from OSU at CERN Reception test –Optical power must be consistent with OSU QA –Check that delivered boards operate with no bit errors at PIN current of 100 μA – 1 mA System test –All boards should be tested within a replica of the full readout chain after passing the reception Opto-board Reception Tests at CERN 18 Opto-board QA Board

DPF 2013 R. Kass 19