1 / 22

Laser-Fiber Connection

Laser-Fiber Connection. Content. Launching optical power into a fiber Fiber-to-Fiber coupling Fiber Splicing and connectors. Coupling Efficiency. [5-1]. Source. Optical Fiber. Radiance (Brightness) of the source.

markkclark
Download Presentation

Laser-Fiber Connection

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Laser-Fiber Connection

  2. Content • Launching optical power into a fiber • Fiber-to-Fiber coupling • Fiber Splicing and connectors

  3. Coupling Efficiency [5-1] Source Optical Fiber

  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)]

  5. Surface emitting LEDs have a Lambertian pattern: [5-2]

  6. Edge emitting LEDs and laser diodes radiation pattern [5-3] For edge emitting LEDs, L=1

  7. Power Coupled from source to the fiber [5-4]

  8. Power coupled from LED to the Fiber [5-5]

  9. Power coupling from LED to step-index fiber • Total optical power from LED: [5-6] [5-7]

  10. Equilibrium Numerical Aperture

  11. Examples of possible lensing schemes used to improve optical source-to-fiber coupling efficiency

  12. Laser diode to Fiber Coupling

  13. 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]

  14. 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.

  15. Mechanical misalignment losses Lateral (axial) misalignment loss is a dominant Mechanical loss. [5-9]

  16. 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.

  17. Experimental comparison of Loss as a function of mechanical misalignment

  18. Fiber end face Fiber end defects

  19. Fiber splicing Fusion Splicing

  20. V-groove optical fiber splicing

  21. 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

  22. Connector Return Loss

More Related