광간섭 단층촬영(OCT)용 PZT 광경로 지연기에서의 편광모드 분산 및 열요동 보상
Compensations of Polarization Mode Dispersion and Thermal Drift？ in Optical Coherence Tomography with PZT Optical Delay Lines
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초록
광간섭 단층촬영(OCT)용으로 원통형 압전소자(PZT)와 단일모드 광섬유를 이용한 광경로 지연기를 제작하여 그 특성을 분석하였다. 광경로 지연기에서 발생하는 편광모드 분산은 편광조절기로 조절하였고, 열요동을 2중 광경로 지연기를 구성하여 최소화 하였다. 이중 광경로 지연기는 단일 광경로 지연기에 비해 2배의 측정 깊이와 속도를 구현하여 18.6±0.5 μm의 해상도, 측정 깊이 1.68 mm, 측정 속도 360.4 mm/s를 각각 얻었다.
Abstract
We have fabricated and characterized optical delay lines for optical coherence tomography, which is composed of cylindrical PZT(piezoelectric transducer) and single mode optical fiber. The polarization mode dispersion from the optical delay lines was compensated by the polarization controllers. By applying the duplex optical delay line, we minimized the thermal drift due to optical delay lines and obtained the scan range of 2 times that of a single optical delay line. The OCT system showed resolution of 18.6±0.5μm, scanning range of 1.68mm, and scanning speed of 360.4mm/s.
참고문헌 (13)
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