The document discusses connection losses in optical fiber communication, including extrinsic losses from Fresnel reflections, fiber misalignment, and other factors, as well as intrinsic losses related to differences in core diameter, numerical aperture, and refractive index profile between connected fibers. It provides equations to calculate insertion loss due to factors like fiber misalignment and presents examples of calculating loss when fibers are laterally offset with and without an index matching fluid.

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
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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.