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OTDR Set-UP - Pulse Width

7/16/2015

3 Comments

 
Picture
All OTDRs regardless of brand have four basic setup requirement i.e. the OTDR user is required to key in these four basic data parameters into OTDR in order to get good and accurate fiber trace analysis.

The required data parameters are :-
  1. Testing Range - Refer Article HERE
  2. Pulse Width
  3. Index of Refraction - Refer Article HERE
  4. Averaging Time - Refer Article HERE
What is Pulse Width?
Picture
  • OTDR pulse width determines length of fiber that can be measured before OTDR traces become noise.
  • Larger pulse width provides larger dynamic range 
  • Narrow pulse width provides reduced dynamic range. 
  • Dynamice range is associated with pulse width and in turn describes length of fiber that can be measured by OTDRs.
Picture
  • Always start testing with a shorter pulse width. 
  • The shorter pulse width is useful for locating any faults that may otherwise be hidden in longer pulse width.
  • A gradual increase in pulse width is necessary to prevent two or more faults from overlapping.

Picture
Rule of Thumb
Long pulse width for longer fiber distance.
Short pulse width for shorter fiber distance.
Always start with shorter pulse width and gradually increase the pulse width to detect all possible fault traces.
3 Comments

OTDR Set-Up - Testing Range

7/14/2015

1 Comment

 
Picture
All OTDRs regardless of brand have four basic setup requirement i.e. the OTDR user is required to key in these four basic data parameters into OTDR in order to get good and accurate fiber trace analysis.

The required data parameters are :-
  1. Testing Range 
  2. Pulse Width - Refer Article HERE
  3. Index of Refraction - Refer Article HERE
  4. Averaging Time - Refer Article HERE
Fiber Optics Testing Range or Distance of Fiber Optics to Test
Many OTDRs have automatic length detection functions unless the end-user knows the approximate fiber distance then testing range can be set manually.
The following diagrams provide OTDR traces in accordance to OTDR testing range settings.
Too Short Testing Range

Picture
  • Assuming the fiber optics approximate distance is 1000 meter. 
  • The OTDR testing range is set to 500 meter .
  • The OTDR image / tracse  only show half of the distance thus provide inaccurate testing results.

Too Long Distance Range
Picture
  • Assuming the fiber optics approximate distance is 1000 meter. 
  • The OTDR testing range is set to 5000 meter .
  • The OTDR image / trace shown is compressed into a scale of 1:5 thus giving smaller OTDR traces which can lead into inaccurate measured values.

Good Distance Range
  • Assuming the fiber optics approximate distance is 1000 meter. 
  • The OTDR testing range is set to 1500 meter - 2000 meter .
  • The OTDR image / traces shown is a good OTDR chart thus measured values.
Picture

Picture
Rule of Thumb
The OTDR Testing Range must always be at least 25% greater than fiber optics under testing.
1 Comment

    Author

    I have been in the field of fiber optics since early 1990s.  I gained fiber optics skills and knowledge via my working experience as end-user, main contractor and sub-contractor and finally as an optical fiber enterpreneur.
     

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  • HOME
  • Our Services
    • Hands-ON Training >
      • 1-Hari OTDR Fiber Optik Praktikal (Melayu)
      • Ujian Kecekapan Fiber Optik
      • 1-Hari Pengujian & Pentauliahan
      • 2-Hari Fiber Optik Praktikal (Melayu)
      • 4-Hari Fiber Optik Praktikal (Melayu)
    • Sijil Kecekapan >
      • MASUK UJIAN CA
    • Accessories >
      • Patchcords
      • Pigtails
      • ProtectionSleeves
    • Test Gears & Tool Kits
    • Fiber Optics Case Studies
  • Contact Us
  • Why Us
    • Trainer's Profile
    • Our Esteemed Clients
    • Hands-ON Training Photos
    • Why Attend Our Fiber Optics Training?
  • My Blogs
    • Fiber Optics Blog
    • Biz Blog (In Malay)