Nd At S Best Practices For Single Mode Tier I Ii Testing 01 2011

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Tier I & Tier II Testing

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Nd At S Best Practices For Single Mode Tier I Ii Testing 01 2011

  1. 1. Best Practices Tier I and Tier II Testing Telecommunication AT&S Conference
  2. 2. Outline <ul><li>Field Testing: </li></ul><ul><li>Cleaning & Visual Inspection </li></ul><ul><li>Optical Loss Testing </li></ul><ul><ul><li>OPM & OLS </li></ul></ul><ul><ul><li>Setting Reference </li></ul></ul><ul><ul><ul><li>Optical Time Domain Reflectometer Testing </li></ul></ul></ul><ul><ul><ul><ul><li>Analyzing traces </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Identifying Anomalies </li></ul></ul></ul></ul>
  3. 3. Field Testing
  4. 4. Basic Field Tests <ul><li>Visual Inspection </li></ul><ul><li>Continuity </li></ul>
  5. 5. Basic Field Tests Source/Meter Attenuation Test (Tier 1) OTDR (Tier 2)
  6. 6. Cleaning & Visual Inspection
  7. 7. Cleaning tools of the trade VFI 2 Cletop & Cleaner VS300 OTDR w Probe One-Click OFI200
  8. 8. FCC2-Fiber Connector Cleaner <ul><li>Nonflammable/Air cargo safe </li></ul><ul><li>Environmentally safe </li></ul><ul><li>Fast drying without residue </li></ul><ul><li>Dissolves light oils, salts, grime and uncured epoxies </li></ul><ul><li>Up to 400+ cleanings per container </li></ul>
  9. 9. CCT- Connector Cleaning Tips <ul><li>Used with FCC2 </li></ul><ul><li>Molded polymer construction </li></ul><ul><li>No fibers, binders, adhesives or outgassing to contaminate connectors </li></ul><ul><li>Traps and holds liquid and particles contaminates </li></ul><ul><li>Perfect bulkhead fit </li></ul>
  10. 10. Basic Visual/Continuity Check
  11. 11. Basic Light Test Continuity Visual Fault Identifier AKA “VFI” <ul><li>Low cost polarity/continuity checker </li></ul><ul><li>Key tool in near end fault location </li></ul><ul><li>Works where OTDR and OLS/OPM may not </li></ul><ul><ul><li>Insert connector into a Visual </li></ul></ul><ul><ul><li>Fault Identifier (VFI) </li></ul></ul><ul><ul><li>Place a small bend in the 900 </li></ul></ul><ul><ul><li>micron fiber behind the </li></ul></ul><ul><ul><li>connector </li></ul></ul><ul><ul><li>A “red light” at the bend will </li></ul></ul><ul><ul><li>indicate that the connector is </li></ul></ul><ul><ul><li>passing light </li></ul></ul>
  12. 12. Basic Light Test Continuity Visual Fault Identifier AKA “VFI”
  13. 13. The Connector End-Face Inspection <ul><li>Clean/defect free connections typically yield lower loss and prevent possible future link failures </li></ul><ul><li>Verify no energy with OPM or OFI </li></ul><ul><li>Inspect connector end-face for dirt </li></ul><ul><li>Clean Connector with CLE-TOP or One-Click </li></ul><ul><ul><li>AT&T standards outline 3 dry cleans and 2 wet cleans </li></ul></ul><ul><li>Once cleanliness at all adapter points is verified use meters/OTDR to determine link is good </li></ul>
  14. 14. The Connector End-Face Body oil (don’t touch the connector end-face!) Multimode Connector
  15. 15. Light Source & Power Meter
  16. 16. Attenuation Test Set SLP 5-6 Test Kit <ul><li>Most accurate measurement of total link attenuation </li></ul><ul><li>Automatic continuity check </li></ul><ul><li>Does not identify or evaluate specific events in the link </li></ul><ul><li>Wave ID speeds testing at multiple wavelengths </li></ul>
  17. 17. OLS 2-DUAL Laser Source <ul><li>1310/1550 nm </li></ul><ul><li>Wave ID Transmit </li></ul><ul><li>2 KHz for fiber ID </li></ul><ul><li>Small size </li></ul>
  18. 18. OPM 5 Optical Power Meters <ul><li>+6 TO -70 & +26 to –50 dBm range </li></ul><ul><li>850/980/1310/1490/1550 & 1625 nm </li></ul><ul><li>Set Reference Feature </li></ul><ul><li>Wave ID Detect </li></ul><ul><li>Tone Detect </li></ul><ul><li>Data Storage-multiple files </li></ul><ul><li>PC Software (TRM) </li></ul>
  19. 19. Testing fibers To test fibers using an OPM & OLS you should have: <ul><li>Two good reference jumpers with connectors that match the fiber under test (the reference fiber type, or core diameter, should match the fiber under test) </li></ul><ul><li>Coupling to test the receive jumper after setting the reference </li></ul><ul><li>Cleaning supplies </li></ul>
  20. 20. ONE-JUMPER REFERENCE Light Source Optical Power Meter Set reference w 1 Jumper (Tx) Tx jumper Tx Rx ANSI/TIA/EIA-526-14 Method B <ul><li>Connect Tx jumper between OLS & OPM </li></ul><ul><li>Press Set Ref button until HELD displayed. Display should show  0.00 dB at the test wavelength(s) </li></ul>
  21. 21. Verify (Rx) jumper Do not disturb Tx jumper at OLS Rx jumper 3. Verify Rx jumper TIA allows 0.75 dB 0.3-0.5 dB typical Adapter Light Source Optical Power Meter Tx jumper ANSI/TIA/EIA-526-14 Method B Change OPM adapter cap (if necessary) 4. Separate the jumpers at the adapter and begin testing ONE-JUMPER REFERENCE
  22. 22. The OTDR
  23. 23. Optical Time Domain Reflectometer (OTDR) OFL280 OTDR <ul><li>Hand Held tool with simple user interface: </li></ul><ul><li>Generates a baseline trace </li></ul><ul><ul><li>A “visual” of the link </li></ul></ul><ul><ul><li>Fiber acceptance tool </li></ul></ul><ul><ul><li>Excellent documentation </li></ul></ul><ul><li>Can identify and evaluate specific events in the link </li></ul><ul><ul><li>Fault location tool </li></ul></ul><ul><ul><li>Limited use in short length fibers </li></ul></ul>
  24. 24. OTDR Block Diagram Control Unit Laser Transmitter Detector LCD Display Splitter Fiber Under Test
  25. 25. Fiber Rings & Using an OTDR <ul><li>Use a launch cable to measure the loss of the near-end connection </li></ul><ul><li>Use a receive cable to measure the loss of the far-end connection </li></ul><ul><li>Fiber Rings must use the same type fiber (50  m, 62.5  m, or single mode) as the link under test </li></ul><ul><li>For testing links under 2 km, the length of the launch and receive cables should be about 100 m (use our 150m) </li></ul>
  26. 26. Generating an OTDR Baseline Trace Intermediate Cross Connect Splice Main Cross-Connect A A B B B A A B Fiber Ring Pulse Suppressor Horizontal Cross-Connect Pulse Suppressor
  27. 27. Backscatter Backscatter portions of an OTDR trace show power (in the fiber) vs. distance Power (dB) Distance Backscatter
  28. 28. OTDR Settings <ul><li>Full Auto </li></ul><ul><ul><li>OTDR “pings” fiber to determine Range, selects an appropriate length greater than the fiber under test and uses the Pulse Width (PW) associated with that range. </li></ul></ul><ul><ul><li>Full Auto Pings every fiber </li></ul></ul><ul><ul><li>Simplifies testing for new technicians </li></ul></ul><ul><ul><li>Assures range setting appropriate for fiber length </li></ul></ul><ul><li>Expert Auto-Once </li></ul><ul><ul><li>Pings the first fiber then uses the same settings for all subsequent tests. </li></ul></ul><ul><ul><li>A user can adjust the settings from the Auto-Once determined settings </li></ul></ul><ul><ul><li>Reduces Test Time </li></ul></ul><ul><ul><li>Risk of not resetting range for next tests when move from short to long fibers </li></ul></ul>
  29. 29. OTDR Settings <ul><li>Expert (Manual) </li></ul><ul><ul><li>The User sets up the: </li></ul></ul><ul><ul><ul><li>Range </li></ul></ul></ul><ul><ul><ul><li>Pulse Width </li></ul></ul></ul><ul><ul><ul><li>Averages (Time) </li></ul></ul></ul><ul><ul><li>Reduces Test Time </li></ul></ul><ul><ul><li>Risk of not resetting range for next tests when move from short to long fibers </li></ul></ul><ul><ul><ul><li>Examples follow </li></ul></ul></ul>
  30. 30. Range Too short : less than link length Link Can’t see entire link – unpredictable results Good : about 1.5x to 2x link length Link Good trace – can see end of fiber Too long : much larger than link length Link Trace is “squashed” into left side of display
  31. 31. Pulse Width Too wide: Can’t resolve events About right: Events can be seen and trace is smooth Too narrow: Trace “disappears” into noise floor Link Link Link Where is this event?
  32. 32. Pulse Width (PW) <ul><li>Long PW used for long Fiber Under Test or trace will be “noisy” or rough </li></ul><ul><li>Short PW used for short Fiber Under Test, if use long PW on short fibers you may miss or clip events </li></ul>
  33. 33. Averages (Time) Too many Trace is smooth but may waste time with little improvement About right: Trace is smooth Too few: Trace is noisy – noise floor is too high Link Link Link
  34. 34. OTDR Settings: Group Index of Refraction <ul><li>If known a user should set the GIR to match the fiber they are testing </li></ul><ul><ul><li>Using a GIR that is different than the actual GIR of the fiber under test may over or under estimate the length of the fiber </li></ul></ul><ul><ul><li>OTDRs typically have a default GIR value </li></ul></ul><ul><ul><li>OFL280 Default Values: </li></ul></ul><ul><ul><ul><li>SM 1310/1550nm =1.4677/1.4682 </li></ul></ul></ul>
  35. 35. OTDR Trace Mechanical Connection Dead Zone 0 200 400 600 800 End Spike Distance Attenuation (dB) Fusion Splice Ghost Reflection
  36. 36. The OTDR Trace Distance Units Attenuation A B DZ Connectors <ul><li>Big “Spike” </li></ul><ul><li>High Fresnel </li></ul><ul><li>Reflection </li></ul>
  37. 37. The OTDR Trace Distance Units Attenuation A B Fusion Splice or Macrobend <ul><li>No “Spike” </li></ul><ul><li>Attenuation </li></ul>
  38. 38. The OTDR Trace Distance Units Attenuation A B <ul><li>Smaller “Spike” </li></ul><ul><li>Less Fresnel </li></ul><ul><li>Reflection </li></ul>Mechanical Splice or Angled Connector
  39. 39. The OTDR Trace: Anomalies Distance Units Attenuation A B Ghost <ul><li>2X Distance from first event </li></ul><ul><li>Not a real event </li></ul><ul><li>No loss </li></ul>
  40. 40. The OTDR Trace: Anomalies Distance Units Attenuation A B Gainer <ul><li>An apparent increase in power </li></ul><ul><li>Located at a fusion splice </li></ul><ul><li>Significant loss if measured in the opposite direction </li></ul>
  41. 41. Conclusion <ul><li>clean, Clean, CLEAN! </li></ul><ul><li>Optical Loss Testing </li></ul><ul><ul><li>Most accurate measurement of total link attenuation </li></ul></ul><ul><ul><li>Automatic continuity check </li></ul></ul><ul><ul><li>Does not identify or evaluate specific events in the link </li></ul></ul><ul><ul><li>Wave ID speeds testing at multiple wavelengths </li></ul></ul><ul><ul><li>Single jumper reference </li></ul></ul><ul><ul><ul><li>Optical Time Domain Reflectometer Testing </li></ul></ul></ul><ul><ul><ul><li>A “visual” of the link </li></ul></ul></ul><ul><ul><li>Fiber acceptance tool </li></ul></ul><ul><ul><li>Excellent documentation </li></ul></ul><ul><ul><li>Fault location tool </li></ul></ul><ul><ul><li>Limited use in short length fibers </li></ul></ul>
  42. 42. Website: www.AFLglobal.com Click on: AFL Telecommunications / Products >> Noyes Test and Inspection Address: AFL 16 Eastgate Park Road Belmont, NH 03220 Telephone: 800-321-5298 (USA) 603-528-7780 ask for Technical Support or Sales Fax: 603-528-2025 To contact Noyes Fiber Systems

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