1. Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS
Optical fiber connectors Fiber alignment Joint Losses Fiber Splices Fiber connectors
Tuesday, April 25, 2017
Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS

2. Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS
Content
Launching optical power into a fiber
Fiber-to-Fiber coupling
Fiber Splicing and connectors
Tuesday, April 25, 2017
Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS

3. Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS
Coupling Efficiency
[5-1]
Source
Optical Fiber
Tuesday, April 25, 2017
Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS

4. Radiance (Brightness) of the source
B= Optical power radiated from a unit area of the source into a unit solid angle [watts/(square centimeter per stradian)]
Tuesday, April 25, 2017
Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS

5. Surface emitting LEDs have a Lambertian pattern:
[5-2]
Tuesday, April 25, 2017
Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS

6. Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS
Fiber-to-Fiber Joint
Fiber-to-Fiber coupling loss:
Low loss fiber-fiber joints are either:
1- Splice (permanent bond)
2- Connector (demountable connection)
[5-8]
Tuesday, April 25, 2017
Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS

7. Power Coupled from source to the fiber
[5-4]
Tuesday, April 25, 2017
Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS

8. Power coupled from LED to the Fiber
[5-5]
Tuesday, April 25, 2017
Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS

9. Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS
Examples of possible lensing schemes used to improve optical source-to-fiber coupling efficiency
Tuesday, April 25, 2017
Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS

10. Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS
Different modal distribution of the optical beam emerging from a fiber lead to different degrees of coupling loss. a) when all modes are equally excited, the output beam fills the entire output NA. b) for a steady state modal distribution, only the equilibrium NA is filled by the output beam.
Tuesday, April 25, 2017
Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS

11. Mechanical misalignment losses
Lateral (axial) misalignment loss is a dominant
Mechanical loss.
[5-9]
Tuesday, April 25, 2017
Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS

12. Longitudinal offset effect
Losses due to differences in the geometry and waveguide characteristics
of the fibers
[5-10]
E & R subscripts refer to emitting and receiving fibers.
Tuesday, April 25, 2017
Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS

13. Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS
Experimental comparison of Loss as a function of mechanical misalignment
Tuesday, April 25, 2017
Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS

14. Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS
Fiber end face
Fiber end defects
Tuesday, April 25, 2017
Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS

15. Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS
Fiber splicing
Fusion Splicing
Tuesday, April 25, 2017
Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS

16. V-groove optical fiber splicing
Tuesday, April 25, 2017
Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS

17. Optical Fiber Connectors
Some of the principal requirements of a good connector design are as follows:
1- low coupling losses
2- Interchangeability
3- Ease of assembly
4- Low environmental sensitivity
5- Low-cost and reliable construction
6- Ease of connection
Tuesday, April 25, 2017
Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS

18. Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS
Connector Return Loss
Tuesday, April 25, 2017
Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS

19. Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS
Figure 7.8 BNC connectors
Tuesday, April 25, 2017
Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS

20. Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS
Figure 7.5 UTP connector
Tuesday, April 25, 2017
Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS

21. Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS
Figure Fiber optics: Bending of light ray
Tuesday, April 25, 2017
Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS

22. Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS
Figure Optical fiber
Tuesday, April 25, 2017
Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS

23. Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS
Figure Fiber-optic cable connectors
Tuesday, April 25, 2017
Dr.P.GNANASUNDARI/PROFESSOR/ECE/SNSCE/OCN/CONNECTORS