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Modal reduction in single crystal sapphire optical fiber
- Source :
- Optical Engineering. 54:107103
- Publication Year :
- 2015
- Publisher :
- SPIE-Intl Soc Optical Eng, 2015.
-
Abstract
- A new type of single crystal sapphire optical fiber (SCSF) design is proposed to reduce the number of guided modes via a highly dispersive cladding with a periodic array of high and low index regions in the azimuthal direction. The structure retains a “core” region of pure single crystal (SC) sapphire in the center of the fiber and a “cladding” region of alternating layers of air and SC sapphire in the azimuthal direction that is uniform in the radial direction. The modal characteristics and confinement losses of the fundamental mode were analyzed via the finite element method by varying the effective core diameter and the dimensions of the “windmill” shaped cladding. The simulation results showed that the number of guided modes were significantly reduced in the “windmill” fiber design, as the radial dimension of the air and SC sapphire cladding regions increase with corresponding decrease in the azimuthal dimension. It is anticipated that the “windmill” SCSF will readily improve the performance of current fiber optic sensors in the harsh environment and potentially enable those that were limited by the extremely large modal volume of unclad SCSF.
- Subjects :
- All-silica fiber
Optical fiber
Materials science
business.industry
Plastic-clad silica fiber
General Engineering
Cladding (fiber optics)
Graded-index fiber
Atomic and Molecular Physics, and Optics
law.invention
Optics
law
Fiber optic sensor
Sapphire
Optoelectronics
business
Hard-clad silica optical fiber
Subjects
Details
- ISSN :
- 00913286
- Volume :
- 54
- Database :
- OpenAIRE
- Journal :
- Optical Engineering
- Accession number :
- edsair.doi...........5b9d756c8379f4597a8a516828e702a4