Radiation-Hardness of VCSEL/PIN Arrays
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1 Radiation-Hardness of VCSEL/PIN Arrays A. Adair, W. Fernando,, H.P. Kagan, R.D. Kass, H. Merritt, J. Moore, A. Nagarkar, S. Smith, M. Strang The Ohio State University M.R.M. Lebbai, P.L. Skubic University of Oklahoma B. Abi, F. Rizatdinova Oklahoma State University March 4,
2 Outline Introduction Radiation hardness of VCSELs Radiation hardness of PINs Summary 2
3 2009 Irradiation After 3 years of irradiating ~2 samples/device with 24 GeV protons at CERN, the following arrays are identified as most promising: 10 Gb/s AOC VCSEL array irradiate 6 AOC arrays in 2009 (limited by vendor problem) Optowell PIN array irradiate 20 Optowell arrays in
4 AOC 10 Gb/s VCSEL 7.5 x MeV n eq /cm 2 w/o long twisted/ coiled fiber Reasonable optical power for 6 arrays irradiated slow recovery of optical power during annealing " need to irradiate a sample of 20 arrays in
5 VCSEL Threshold/Slope Fitting Fit LI curve to 2 nd order polynomials compare threshold and slope (1 st order) vs dosage etc. 5
6 VCSEL Thresholds Thresholds increase after irradiation as expected 6
7 VCSEL Power vs Temperature 7.5 x MeV n eq /cm 2 Cooler VCSEL produces more optical power 7
8 VCSEL Slope Slopes of irradiated VCSEL is similar to non-irradiated VCSEL Slopes decrease with increasing temperature 8
9 PIN Responsivity after Irradiation 8.1 x MeV n eq /cm x MeV n eq /cm 2 PIN arrays were irradiated in two batches of 10 arrays each Beam alignments were different for the two batches Different degradation in responsivity for the two batches 9
10 PIN Responsivity vs Dosage the two batches have different responsivity vs dosage based on naive assumption of linear proton flux vs channel number 10
11 Responsivity (A/W) PIN Responsivity vs Temperature Optowell Pre-Irrad (By hand) Post-Irrad (-25 C) Post-Irrad (room) Post-Irrad (10 C) Post-Irrad (50 C) Post-Irrad Fit 8.1 x MeV n eq /cm Channel Responsivity is slightly higher at lower temperature VCSEL and PIN have similar temperature dependence 11
12 PIN Responsivity vs Bias Voltage can fully recover pre-irradiation responsivity with high bias voltage 12
13 PIN Current vs Bias Voltage Optowell Room temp -25 C 10 C 50 C 1 st run 2 nd run 0 V 40 V Sudden breakdown in PIN current during ramping of bias voltage Once broken, entire array has high leakage current even at low voltages 13
14 PIN Leakage Current Problem Three out of 20 irradiated Optowell PIN arrays are now inoperable due to high leakage current Cause of breakdown unknown: devices are not actually capable of operation at 40V as claimed by vendor? did radiation damage reduce the operation voltage? Recovery plan: need to purchase/package a large sample of Optowell arrays (> 20) for bias current study followed by irradiation in summer 2010 communicate with vendor need to purchase/package a large sample of arrays (> 20) from a second vendor (ULM) for irradiation in summer
15 Summary AOC VCSEL arrays have reasonable power after irradiation plan to irradiate 20 arrays in 2010 Optowell PIN arrays have good responsivity after irradiation 3 out of 20 Optowell PIN arrays broken need further investigation and second vendor VCSEL and PIN have similar temperature dependence good to operate the devices at room temperature or lower 15
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