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Melanie N. Ott Sigma Research and Engineering / NASA Goddard Space Flight Center Component Technologies and Radiation Ef

Fiber Optic Cable Assembly Characterization Studies at NASA Goddard Space Flight Center. Melanie N. Ott Sigma Research and Engineering / NASA Goddard Space Flight Center Component Technologies and Radiation Effects Branch Melanie.ott@gsfc.nasa.gov 301-286-0127

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Melanie N. Ott Sigma Research and Engineering / NASA Goddard Space Flight Center Component Technologies and Radiation Ef

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  1. Fiber Optic Cable Assembly Characterization Studies at NASA Goddard Space Flight Center Melanie N. Ott Sigma Research and Engineering / NASA Goddard Space Flight Center Component Technologies and Radiation Effects Branch Melanie.ott@gsfc.nasa.gov 301-286-0127 URL: http://misspiggy.gsfc.nasa.gov/tva/authored/fo_photonics.htm The Team: Patricia Friedberg, Matthew Dodson, Shawn Macmurphy, Dan Ginghold, Juan Vela NEPP Workshop 2002: Optical Cables for Space Flight

  2. Outline • Objectives • Qualification performance testing • Failure modes and innovative test methods • Typical characterization plan • Examples: epoxy studies • Examples: MTP studies • Examples: Cable studies • Examples: Radiation studies • Conclusions: planned work NEPP Workshop 2002: Optical Cables for Space Flight

  3. Objectives • To enable the usage of commerical off the shelf optical fiber interconnection technology for space flight use. • To develop innovative test methods to make the path to usage quicker and less expensive. • To provide a variety of alternatives to a variety of environments. NEPP Workshop 2002: Optical Cables for Space Flight

  4. Performance Testing and Requirements for Optical Cable Assemblies • Insertion loss • Return loss • Crosstalk • Numerical aperture • Transmission capacity • Attenuation • Mating durability • Fungus • Toxic hazard, Odor, Flammability • Vacuum stability • Atomic oxygen • Solar UV radiation • Plasma • Ionizing radiation • ESD • Thermal shock • Strippability • Crush resistance • Strength testing • Thermal cycling • Bend test • Low and high temperature cable bend • Flexibility • Impact • Accelerated aging • Jacket shrinkage • Flexure endurance • Humidity resistance • Cable blocking • Freeze test • Cable clamping • Fluid immersion • Cable-to-cable abrasion • Jacket tensile strength and elongation • Vibration • Ambient light susceptability • Cable twist bend • Cable twist NEPP Workshop 2002: Optical Cables for Space Flight

  5. Technology Validation • What do I validate this technology? • Failure modes study • What approach do I take? • System type approach to the assembly • How? • System analysis (materials, design,compatibilities etc) • Characterization plan that takes into account the greatest number of failure modes for space flight. • Design innovative testing methods to expedite validation NEPP Workshop 2002: Optical Cables for Space Flight

  6. Failure Modes and Testing NEPP Workshop 2002: Optical Cables for Space Flight

  7. Characterization Plan • Materials analysis and test, • Termination validation as a system. • Thermal vacuum use configuration when possible. • Thermal cycling, • long dwell at extremes, 1 °C/min to extent of specification, -20°C to +85 °C for COTS, -55°C to +125°C for Space, 40 cycles, 25 – 30 minute soak, 1 or 2 °C/min rate. • Vibration testing, • Random vibration to protoflight levels, • Verified survival and operational ability during launch using typical launch parameters ~ 14.1 grms total for protoflight small box components. • 3 minutes per axis, 20 grms total • Radiation analysis and test. • Two dose rate test and extrapolate to environment Space flight environments from GSFC are less than 1 rad/min and more typically less than .1. NEPP Workshop 2002: Optical Cables for Space Flight

  8. Materials Characterization • Through analysis, identify COTS materials without heritage (epoxy, coating, etc) for use in space assembly. • Validate through termination process as a system, (cure for epoxy, strip test for coatings, visual, optical performance.) • Validate through test methods, • Thermal (array connector ), ASTM-E595 • ASTM-E595 in assembly configuration (simplex connector). • ASTM-E595 in cable configuration (coating material with and without connector). NEPP Workshop 2002: Optical Cables for Space Flight

  9. Epoxy Studies Tracon BA-253 only fiber optic epoxy Tested AngstromBond AB9119, 9112 in configuration and out, AB9119 passed using ASTM-E595. MTP connector assembly, epoxy not approved for flight MTA-022, BA-253 failed termination study for use on MTP. Evaluation through termination and test of new epoxy AB9320. If AB9320 passes, next use ASTM-E595 to verify that the epoxy will not outgass and will be compatible with system. NEPP Workshop 2002: Optical Cables for Space Flight

  10. MTP Assemblies Studies X Y Z MTP array connector with 12 optical fiber ribbon cable, - 62.5/125/250 micron, commercial system. - 100/140/250 micron, spaceflight system. - Termination study NEPP Workshop 2002: Optical Cables for Space Flight

  11. MTP Characterization ; 100/140 space flight vibration test Vibration Test Results: DUT B, Y Axis NEPP Workshop 2002: Optical Cables for Space Flight

  12. MTP Termination Study 62.5/125 MTP assembly study: found failures related to termination process. During process, cracking Epoxy alternatives necessary for 100/140 version. Currently conducting a study on process and epoxy Curing, Visual, Optical Performance, Thermal Cycling, ASTM-E595 on alternative epoxy NEPP Workshop 2002: Optical Cables for Space Flight

  13. Cable Studies -55°C to +125°C, 20 min dwell at extremes, 2 °C/min NEPP Workshop 2002: Optical Cables for Space Flight

  14. Radiation Studies MTP Assembly 4 rads/min & 27 rads/min at +25 °C, 1300 nm 5.24 m with mated pair. A(D) = 7.47*10-4f.1993 D.8007 NEPP Workshop 2002: Optical Cables for Space Flight

  15. Radiation Studies: Actual Data Commercial 62.5/125/250 OFS Fitel Collected Data NEPP Workshop 2002: Optical Cables for Space Flight

  16. Radiation Studies: Extrapolation Commercial 62.5/125/250 OFS Fitel Extrapolated Data for -25°C NEPP Workshop 2002: Optical Cables for Space Flight

  17. Planned Work MTP twelve channel array connector and optical fiber ribbon cable Termination study Alternatives to epoxy, materials study Diamond AVIMS characterization for space flight Radiation: Optical fiber database for space flight environments. http://misspiggy.gsfc.nasa.gov/tva/authored/fo_photonics.htm http://www.nepp.nasa.gov/ This work is funded by NEPP Packaging Project & Electronics Radiation Characterization Project NEPP Workshop 2002: Optical Cables for Space Flight

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