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OPTICAL FIBER COMMUNICATION
Where Beauty of Light and Semiconductor Devices mixed
together to transformed the History of Communication
Technology .
Unit 4 (OFC)-Part-2
Connection Losses
Kalyan Acharjya
kalyan.acharjya@gmail.com
kalyan5.blogspot.in
10/7/2016 3
Sorry, I opened the lock without prior permission taken from the
original owner. Some images used in this presentation contents are
copied from Book’s Fiber Optics & Optoelectronics By R.P. Khare and
some websites without permission.
Only Original Owner has full rights reserved for copied images.
This PPT is only for fair academic use.
Kalyan Acharjya
Connection Losses
• Extrinsic Losses
– Loss Due to Fresnel Reflections
– Fiber to Fiber Misalignment Losses
– Losses Due to other Factors
• Intrinsic Losses (Not Compatible)
– The Core Diameter
– NA (The Relative index Difference)
– The Refractive Index Profile
Loss General Expression
L (Due to factors) =-10Log (Base 10) η
Where η is Coupling Efficiency
Fresnel Reflections
Fiber to Fiber Misalignment Losses
Fiber to Fiber Misalignment Losses
Fiber to Fiber Misalignment Losses
Eta (Long)=[1-DEL X NA/4an]
Fiber to Fiber Misalignment Losses
Extrinsic Losses Due to other Factors
• Non Flatness of end Surfaces
• Dust
• Joint Losses
Intrinsic Losses
Intrinsic Losses
Intrinsic Losses
• Core Diameter Mismatch
• NA Mismatch
Intrinsic Losses
• Mismatch Index Profile
Connector losses Optical Fiber Cable
Thank You
kalyan5.blogspot.in
Solve It!
• Two compatible multimode SI fiber are jointed
with lateral offset of 10% of the core radius.
The RI of the core of each fiber 1.5. Calculate
the insertion loss at the joint when-
– There is small air gap.
– An index matching fluid is inserted between the
fibers ends.

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Connector losses Optical Fiber Cable