Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
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The Development of Double Clad Fiber and Double Clad Fiber Coupler for Fiber Based Biomedical Imaging Systems

  • Ryu, Seon-Young (Department of Information and Communications, Gwangju Institute of Science and Technology) ;
  • Choi, Hae-Young (Department of Information and Communications, Gwangju Institute of Science and Technology) ;
  • Ju, Myeong-Jin (Department of Information and Communications, Gwangju Institute of Science and Technology) ;
  • Na, Ji-Hoon (Department of Information and Communications, Gwangju Institute of Science and Technology) ;
  • Choi, Woo-June (Department of Information and Communications, Gwangju Institute of Science and Technology) ;
  • Lee, Byeong-Ha (Department of Information and Communications, Gwangju Institute of Science and Technology)
  • Received : 2009.06.10
  • Accepted : 2009.08.17
  • Published : 2009.09.25
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Abstract

We report the fabrication of double clad fiber (DCF) and DCF coupler, suitable for fiber based imaging systems requiring the dual-channel transmission. Unlike the conventional DCF which uses silica for both cladding layers, the proposed DCF uses a low-index polymer for its outer-cladding layer coated over the conventional silica inner-cladding layer. The DCF is drawn with a conventional SMF preform but a low-index polymer coating is used for both jacket and outercladding of the fiber. To achieve the cladding mode coupling, a DCF coupler is fabricated by simply twisting two pieces of the proposed DCF after removing the polymer-coating at contacting regions. A cladding mode coupling ratio of 30% was achieved with a contact length of 16 cm. The proposed DCF and DCF coupler were employed in a composite optical coherence tomography (OCT) and fluorescence spectroscopy (FS) system, and both OCT images and FS signal from a plant tissue are measured simultaneously.

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References

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