저손실 융착접속을 이용한 광자결정 광섬유 간섭계
Fiber Interferometers Based on Low Loss Fusion Splicing of Photonic Crystal Fibers
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초록
본 논문에서는 포토닉 밴드갭 광섬유(Photonic Bandgap Fiber: PBGF) 사이에 중공광섬유(Hollow Optical Fiber: HOF)를 융착접속시켜 만든 광섬유 간섭계와 넓은 모드 면적을 가지는 광자결정 광섬유(Large Mode Area-Photonic Crystal Fiber: LMA-PCF)사이에 HOF를 융착접속시켜 만든 광섬유 간섭계의 온도 및 스트레인에 대한 광학적 특성을 분석하였다. PBGF 또는 LMA-PCF 와 HOF의 융착접속시 광섬유내 공기구멍을 최대한 유지하도록 융착조건을 최적화하여 접속 손실을 줄였다. PBGF와 HOF로구성된 광섬유 간섭계의 온도 및 스트레인에 대한 민감도는 각각 15.4 pm/℃와 0.24 pm/με으로 측정되었으며, LMA-PCF와 HOF 로 구성된 광섬유 간섭계의 온도 및 스트레인에 대한 민감도는 각각 17.4 pm/℃와 0.2 pm/με으로 측정되었다.
Abstract
We report temperature and strain sensing characteristics of two kinds of in-line fiber interferometers. One interferometer consists of a section of Hollow Optical Fiber(HOF) spliced between two Photonic Bandgap Fibers(PBGF) and the other is built by splicing a section of HOF between two Large Mode Area-Photonic Crystal Fibers(LMA-PCF). To minimize the splice losses, we carefully optimized the heating time and arc current of the splicer so as not to collapse the air holes of the fiber. It is found that the first interferometer has a temperature sensitivity of 15.4 pm/℃ and a strain sensitivity of 0.24 pm/με. The other interferometer exhibits a temperature sensitivity of 17.4 pm/℃ and a strain sensitivity of 0.2 pm/με.
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