Losses during fiber connector

1. OPTICAL FIBER COMMUNICATION
Where Beauty of Light and Semiconductor Devices mixed
together to transformed the History of Communication
Technology .

2. Unit 4 (OFC)-Part-2
Connection Losses
Kalyan Acharjya
kalyan.acharjya@gmail.com
kalyan5.blogspot.in

3. 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
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This PPT is only for fair academic use.
Kalyan Acharjya

4. 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

5. Loss General Expression
L (Due to factors) =-10Log (Base 10) η
Where η is Coupling Efficiency

6. Fresnel Reflections

7. Fiber to Fiber Misalignment Losses

8. Fiber to Fiber Misalignment Losses

9. Fiber to Fiber Misalignment Losses
Eta (Long)=[1-DEL X NA/4an]

10. Fiber to Fiber Misalignment Losses

11. Extrinsic Losses Due to other Factors
• Non Flatness of end Surfaces
• Dust
• Joint Losses

12. Intrinsic Losses

13. Intrinsic Losses

14. Intrinsic Losses
• Core Diameter Mismatch
• NA Mismatch

15. Intrinsic Losses
• Mismatch Index Profile

17. Thank You
kalyan5.blogspot.in

18. 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.