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Slab Coupled Fibers

Overview - What is a Slab Coupled Fiber?

Slab Coupled Fibers perform as wavelength selective couplers with a wide variety of applications. The BYU Photonics lab's technique for exposing the evanescent field of an optical D-fiber serves as a unique platform for creating Slab Coupled Fibers. Coating the exposed evanescent field of a fiber with a polymer slab waveguide offers wavelength selective coupling between the optical fiber and polymer slab. Coupled Mode Theory indicates that this coupling occurs at resonant frequencies based on slab dimensions and index. Our results show wavelength selective coupling with narrow resonances and extreme sensitivity to index variation of the polymer slab. While very similar in operation to Side Polished Fibers with a slab overlay, Slab Coupled Fibers offer new freedoms in the fabrication process that allow further control in the effectiveness of the device.

The presence of the slab waveguide in the evanescent region of the etched D-fiber above acts as a mode sink for coupled modes. The coupling spectrum on the right shows the transmission spectrum for the D-fiber with a power drop at the location of the mode coupled into the slab waveguide. Using environmentally sensitive materials for the slab waveguide yields shifting of the coupled mode based on changes in environmentally sensitive variables such as temperature, electric field, and chemical presence. Navigate the following expandable list for further information on Slab Coupled Fibers.
  1. Benefits of D-Fiber
  2. Coupled Mode Theory
  3. Fabrication of Slab Coupled Fibers
  4. Applications
  5. Current Results

For inquiries and suggestions, please email: Rich Gibson

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