Abstract
주파수영역 광 간섭 단층촬영 시스템을 위한 파장가변 광원과 주파수 보정(calibration)을 위한 신호처리계를 구현하였다. 제작된 레이저의 평균출력을 부스터(booster) 반도체 광 증폭기를 이용하여 14 mW까지 증폭시키고, 레이저 스펙트럼의 편이(shift)를 보상하였다. 패브리-페롯 에탈론(Fabry-Perot etalon)과 디지털 신호처리(digital signal processing)로 신호처리계를 제작함으로서 파장가변광원의 속도가변에 따른 비트주파수(beat frequency)의 넓어짐을 보정하였다. 제작된 광 간섭 단층촬영 시스템은 종방향 주사속도 154.4 kHz, 측정깊이 0.95 mm, 종방향 분해능 <TEX>$12{\pm}0.37{\mu}m$</TEX>의 특성을 가진다. We demonstrate the wavelength swept source and signal processing for the frequency domain optical coherence tomography. The laser output performance is improved by using a semiconductor optical amplifier with a booster amplifier. The laser generates 14 mW of average power of which wavelength shift in the lasing spectral shape is compensated. Adopting a Fabry-Perot etalon and digital signal processing, the broadening of the beat frequency due to the variance of wavelength-sweep-velocity is calibrated. The optical coherence tomography system shows 154.4 kHz of axial scanning speed, 0.95mm of depth range, and <TEX>$12{\pm}0.37{\mu}m$</TEX> of axial resolution.
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