Losses in optical wires

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This presentation describes the losses in the optical fiber and how these losses are measured.

This presentation describes the losses in the optical fiber and how these losses are measured.

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  • 1. A New Approach for IdentifyingFiber Fault and DetectingFailure Location Presented by SANKET S YAVALKAR ME (E&TC)AuthorsM.S.AbRahman [1], Ng Boon Chuan[2],Aswir Premadi[3],Kasmiran Jumari[4].[1][2][3][4] University Kebangsaan, Malasysia
  • 2. Flow of Paper : Abstract Aim Fault finding methods OTDR Experimental Setup Experimental Results Discussion on Results Conclusion
  • 3. Abstract : This paper proposed and demostrate the need of centralized failure detection system (CFDS) with OTDR .
  • 4. Aim: Create a matlab based graphical user interface (GUI) named as Centralized Failure Detection System(CFDS).
  • 5. Fiber Optic Testing After the cables are installed and terminated, its time for testing….. For every fiber optic cable plant, you will need to test for : continuity end-to-end loss troubleshoot the problems
  • 6. Getting Started …..1. Have the right tools and test equipment for the job. You will need:  Source and power meter  Reference test cables  Fiber Tracer  Cleaning materials  OTDR and launch cable2. Know how to use your test equipment3. Know the network youre testing...4. Safety first….
  • 7.  Fiber optic testing includes three basic tests that we will cover separately : Optical Fiber Testing Visual Inspection Loss testing Network Testing
  • 8. 1.Visual Inspection [1]1. Visual Tracing2. Visual Fault Location3. Visual Connector Inspection
  • 9. 2. Loss Testing [1] 1. Power Testing
  • 10. 2. Testing Loss  Loss = Transmitted – Received  Loss =>noiseNoise due to:  Source  Cable
  • 11. Loss testing [1] Loss in Cable single- double- ended loss ended loss
  • 12. 1.Single-ended loss [1]Measures : the loss of the connectormated to the launch cable the loss of any fiber
  • 13. 2.Double-ended loss[1]Measures : Two connectors loses ,one on each endLoss of all the cable orcables in between
  • 14. What Loss Should You GetWhen Testing Cables? [1] Lets take an example,I. For each connector, figure 0.5 dB loss (0.7 max)II. For each splice, figure 0.2 dBIII. For multimode fiber, 0.1 dB per 100 feet for 850 nm OR For singlemode fiber, 0.5 dB per km for 1300 nmSo for the loss of a cable plant= (0.5 dB X # connectors) + (0.2 dB x # splices) + fiber loss on the total length of cable
  • 15. 3. Network Testing [2] OTDR Testing  Operational Time Domain Reflectometer(OTDR).[1]
  • 16. PRINCIPLE OF WORKING :
  • 17. Advantages of CFDS with OTDR:OTDR CFDS
  • 18. EXPERIMENTAL SETUP[3] : PC OTDR ONU
  • 19. Flow Chart of Mechanism of Failure Location[3] Start Fiber measurement Save it in OTDR Transfer results into computer Activate the CFDS and Display Graphs showing results Check fiber’s Status Show faulty fiber and failure location End
  • 20. Results : [3] Transferring files from FTB-100B into computer :
  • 21. Results [3] Execution display for test 8 in working condition :
  • 22. Results [3] Execution display for test 8 in non-working condition :
  • 23. Results : [3] Every 8 graphs displayed in Line’s Status window for centralized monitoring :
  • 24. Results : [3] Line 8 is failure at distance 15.1867 km:
  • 25. Results : [3] Optical power in line 1 decreasing 0.595dB at 15.1969km (In Line detail window):
  • 26. Discussion• Here Centralized failure detectionsystem (CFDS) is developed for the userswho are inexperianced or non-specializedin optical fiber testing process.• Besides, it locates the fiber breakor failure, drastically redusingtroubleshooting and repair time.
  • 27. Conclusion
  • 28. References[1] http://www.LANshake.com/ fiber-optic-tutorial-testing.aspx.html[2] EXFO, FTB-150 Optical Time Domain Reflectometer Series Instruction Manual.[3] R AHMAN M.S.A., NG B.C., “MATLAB-based graphical user interface development for centralized failure detection system (CFDS) in SCAN network”, Journal of Optical Communications 29(3), 2008, pp. 152–156.