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Testing & Commissioning Optical Fiber Link -Part 2

1/6/2017

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Testing & Commissioning Optical Fiber Link -Part 1 HERE


More Examples on Calculation of Optical Power Budget

Assuming our Multimode Fiber Optics cabling configuration as below :
Picture
As per Singlemode, there are 2 common operating wavelength namely 850nm and 1300nm.
The respective attenuation or loss as illustrated below :

Picture
Figure 2 : Operating Wavelength Attenuation

Please refer to the following link for calculation of optical fiber budget formula :-
Testing & Commissioning Optical Fiber Link -
Part 1 HERE

Optical Power Budget Calculation
Using above Figure 1 fiber optics schematic diagram followings can be deduced :
a. Total length of fiber is 1km (please use OTDR to measure actual fiber length)
b. 2 nos of splicings
c. 2 nos of connectors
d. MM operating wavelength of 850 nm - 3dB/km, 1300nm - 1dB/km


Operating Wavelength at 850nm
Maximum Allowable Loss = Fiber Loss + Splicing Loss + Connector Loss

= (1 km x  3 dB/km) + ( 2 x 0.2dB) + ( 2 x 0.5dB)
= 4.4dB

Operating Wavelength at 1300nm
Maximum Allowable Loss = Fiber Loss + Splicing Loss + Connector Loss

= (1 km x 1 dB/km) + ( 2 x 0.2dB) + ( 2 x 0.5dB)
= 2.4dB
  • As such, when we do actual measurement using power meter & light source the measured loss must be less than the calculated allowable maximum loss. 
  • If the actual measurement value is higher than calculated maximum loss then most likely there will no communication or transfer data between Station A and Station B.​
On next articles  we will emphasized on
  • Calculating budget loss if there are jointings or splicings between fiber optics cable 
  • Calculating budget loss if few fiber optics cable are connected via connectors
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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
  • ABOUT US
  • Training
    • 2-Hari Fiber Optik Praktikal (BM)
    • 4-Hari Fiber Optik Praktikal (BM)
    • 1-Hari OTDR Fiber Optik Praktikal (BM)
    • 1-Hari Fiber Optik Splicing (BM)
    • 2-Hari Fiber Optik Splicing (BM)
    • 1-Hari Testing, Commissioning, Troubleshooting Tier 1 & Tier 2
    • 7-Hari Pemasangan Fiber Optik (Melayu)
  • CA1C & CA2C
    • iNFO ASAS SIJIL CA
    • Salinan Sijil CA
    • Pembaharuan Sijil CA
    • Lokasi Ujian Fizikal CA
    • KESAHIHAN SIJIL CA
    • Kelas ONLINE CA1C & CA2C
    • Kelas Fizikal CA1C & CA2C
  • PRODUK
    • Test Gears & Tool Kits
    • Accessories >
      • Pigtails
      • Patchcords
      • ProtectionSleeves
  • ARTIKEL
    • Safety In Fiber Optics
    • Fiber Optics Case Studies
    • Fiber Optics Practices Around The World
    • Anggaraan / Bidaan
    • My Blogs >
      • Biz Blog (In Malay)
    • Training Benefits
    • Auditing Fiber Optics
    • Langkah Sulung Biz Fiber Optik