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Radiation Effects in Active Optical Components

Radiation Effects in Active Optical Components. Robert A. Reed, Ken LaBel, Janet Barth, Henning Leidecker, Allan Johnston, Paul Marshall and Cheryl Marshall. Radiation Effects and Analysis Group. Outline. Introduction to radiation effects in optical components Radiation environment

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Radiation Effects in Active Optical Components

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  1. Radiation Effects in Active Optical Components Robert A. Reed, Ken LaBel, Janet Barth, Henning Leidecker, Allan Johnston, Paul Marshall and Cheryl Marshall 4/27

  2. Radiation Effects and Analysis Group 4/27

  3. Outline • Introduction to radiation effects in optical components • Radiation environment • optical components • Radiation induced transients in optical components • Radiation induced degradation mechanisms in optical components • Summary 4/27

  4. Total Ionizing Dose Single Event Transient 2.5 14 12 2.0 10 6 8 CTR 1.5 5 I-lite (mA) 6 4 4 1.0 (V) 3 2 2 0 0.5 0 20 40 60 80 100 120 1 Dose (kRad(Si)) 0 0 0 100 200 300 400 500 600 12x1010 0 4x1010 8x1010 Displacement Damage (ns) Fluence (p/cm2) Radiation-Induced Effects in Optical Components 4/27

  5. Radiation Environments • Heavy Ion LET Spectra • Total Ionizing Dose • Proton Spectra 4/27

  6. Heavy Ion 4/27

  7. Total Ionizing Dose 4/27

  8. Proton Environment 4/27

  9. Equivalent Proton Fluence for Displacement Damage 4/27

  10. LED DETECTOR Active Optical Components • Optical coupling of two electrical circuits with an optical transmitter and an optical receiver. • LEDs, Phototransistors, photodiodes, etc... • Optocoupler is one type of optical components • CTR = Io/ If 4/27

  11. Total Ionizing Dose Single Event Transient 2.5 14 12 2.0 10 6 8 CTR 1.5 5 I-lite (mA) 6 4 4 1.0 (V) 3 2 2 0 0.5 0 20 40 60 80 100 120 1 Dose (kRad(Si)) 0 0 0 100 200 300 400 500 600 12x1010 0 4x1010 8x1010 Displacement Damage (ns) Fluence (p/cm2) Radiation-Induced Effects in Optical Components 4/27

  12. 6 5 Amplitude (V) 4 3 2 1 0 0 100 200 300 400 500 600 (ns) A sample SET from an HP QCPL-6731 Optocoupler Single event transients induced in photodetector can be passed to circuitry that follows the optocoupler if the amplification stage recognizes the SET as a valid signal 4/27

  13. 1.2E-07 0 degrees 1.0E-07 85 degrees 87.5 degrees /device) 90 degrees 8.0E-08 92.5 degrees 2 95 degrees 6.0E-08 Cross-Section (cm 4.0E-08 2.0E-08 0.0E+00 30 80 130 180 230 280 Proton Energy (MeV) Ground Based Single Event Transient Measurements 4/27

  14. Total Ionizing Dose Single Event Transient 2.5 14 12 2.0 10 6 8 CTR 1.5 5 I-lite (mA) 6 4 4 1.0 (V) 3 2 2 0 0.5 0 20 40 60 80 100 120 1 Dose (kRad(Si)) 0 0 0 100 200 300 400 500 600 12x1010 0 4x1010 8x1010 Displacement Damage (ns) Fluence (p/cm2) Radiation-Induced Effects in Optical Components 4/27

  15. Total Ionizing Dose Degradation of Phototransistor 4/27

  16. Total Ionizing Dose Degradation of LED 4/27

  17. Total Ionizing Dose Single Event Transient 2.5 14 12 2.0 10 6 8 CTR 1.5 5 I-lite (mA) 6 4 4 1.0 (V) 3 2 2 0 0.5 0 20 40 60 80 100 120 1 Dose (kRad(Si)) 0 0 0 100 200 300 400 500 600 12x1010 0 4x1010 8x1010 Displacement Damage (ns) Fluence (p/cm2) Radiation-Induced Effects in Optical Components 4/27

  18. Optocoupler Current Transfer Ratio Degradation with Proton Fluence 4/27

  19. DC/DC Power Converter that Contains an Optocoupler 4/27

  20. LED Data from the Early 80’s 4/27

  21. Various Optocoupler Results 4/27

  22. Observed Properties of a “good” optocouplers • RADIATION RESPONSE IS KNOWN • Single Event Transient • Observed in devices that operate at > 5MhZ • Circuit filtering is possible • Total Ionizing Dose • Shielding may help reduce TID (WARNING) • Displacement Damage • Not Amphoterically doped • LED wavelength <800nm • Maximize LED drive (WARNING) • Operation of phototransistor in saturation 4/27

  23. SUMMARY • Evaluation of three radiation induced effects is important for optical components links • SET, TID and Displacement Damage • Unable to predict radiation response from manufacture information • Data is available on some optical components • Radiation testing at off site proton facility • Simultaneous evaluation of SET, TID and Displacement Damage • Some optical components perform very well in the space radiation environment 4/27

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