Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Long-Period Fiber Gratings Based on Periodically Surface-Etched Structure Imprinted by Using a Photoresist Polymer

폴리머 장주기 패턴을 이용한 표면 식각된 격자 구조 기반의 장주기 광섬유 격자

  • Received : 2010.09.28
  • Accepted : 2011.01.05
  • Published : 2011.02.25
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Abstract

A new fabrication technique of long-period fiber gratings with periodically surface-etched structures is proposed. Transmission characteristics of the periodically surface-etched long-period fiber gratings are improved by changing strain because of variation of coupling strength between the core and the cladding modes. The sensitivities of the periodically surface-etched long-period fiber gratings to strain, torsion, and ambient refractive index were measured. The strain and the torsion sensitivities were measured to be $-0.033\;dB/\mu\varepsilon$ and -1.30 nm m/rad, respectively. The ambient index sensitivity was measured to be -31.33 nm/RIU from a range from 1.33 to 1.42.

본 연구에서는 PR 폴리머 장주기 패턴을 이용하여 표면 식각된 격자 구조 기반 장주기 광섬유 격자 제조 방법을 제안하고 외부 장력 및 비틀림, 그리고 외부 굴절률에 대한 민감도를 측정하였다. 외부 장력을 인가함에 따라 특정파장에서 광결합 계수 변화에 의한 공진파장이 형성되고 투과도가 감소하게 된다. 손실이 생기게 되고 민감도는 $-0.033\;dB/\mu\varepsilon$로 측정되었다. 비틀림과 외부 굴절률에 변화에 대해서도 표면 식각된 격자 구조 기반 장주기 광섬유 격자의 투과 특성이 변하며 민감도는 각각 -1.30 nm m/rad, -31.33 nm/RIU로 측정되었다.

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References

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