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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
Star link
2/13/2018 03:22:22 pm

hello author, I went through the article, good information on OTDR Set-UP - Pulse Width. Literally essential for the fiber optics maintenance and operation. Connecting damaged Fiber Optics, is a tedious task, fibershot OTDR locate faults in deployed fiber optic networks, for both multimode and single-mode networks, including FTTx PONs. Thank you.

Reply
Hemanta Saikia
1/11/2019 09:08:10 pm

what is scatter coefficient ? how to it set on OTDR

Reply
Said alramadneh link
4/3/2019 03:58:15 am

-can i get information about pulse width for OTDR setting starting from 1 km up to 20 km .
regards

said

Reply



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    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
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    • Sijil Kecekapan >
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    • Accessories >
      • Patchcords
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  • 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)