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Measurement of Numerical Aperture of Graded-index Plastic Optical Fiber by Using a Variable Aperture
- Source :
- Korean Journal of Optics and Photonics. 22:5-9
- Publication Year :
- 2011
- Publisher :
- Korean Journal of Optics and Photonics, 2011.
-
Abstract
- There are technical difficulties in measuring the numerical apertures of multi-mode gradient-index plastic optical fibers (GI-POFs) due to their strong speckle noise originating from dopants, non-uniformity of gradient-index profile, and multi-mode interference. Therefore, we propose a new method of obtaining the numerical aperture by controlling the size of the incident laser beam and measuring the numerical aperture of GI-POF. The results show that we can get a value for the numerical aperture of GI-POF very similar to that measured by the conventional method. We can also obtain the optimum launching condition of input beam and maximum coupling efficiency.
- Subjects :
- Optical fiber
Multi-mode optical fiber
Materials science
Aperture
business.industry
Astrophysics::Instrumentation and Methods for Astrophysics
Speckle noise
law.invention
Numerical aperture
Angular aperture
Optics
Normalized frequency (fiber optics)
law
Physics::Accelerator Physics
business
Beam divergence
Subjects
Details
- ISSN :
- 12256285
- Volume :
- 22
- Database :
- OpenAIRE
- Journal :
- Korean Journal of Optics and Photonics
- Accession number :
- edsair.doi...........95dec64bc75e2f4ce49d8eadbe31bcbc