Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Implementation of the Wavelength-Swept-Source and Signal Processing for the Frequency Domain Optical Coherence Tomography

주파수영역 광 간섭 단층촬영 시스템을 위한 파장가변 광원 및 신호처리계의 구현

  • Lee, Eung-Je (College of Electronics and Information / Institute for Laser Engineering, Kyunghee University) ;
  • Kim, Yong-Pyung (College of Electronics and Information / Institute for Laser Engineering, Kyunghee University)
  • 이응제 (경희대학교 전자정보대학 / 레이저공학연구소) ;
  • 김용평 (경희대학교 전자정보대학 / 레이저공학연구소)
  • Published : 2007.10.25
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Abstract

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 $12{\pm}0.37{\mu}m$ of axial resolution.

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 $12{\pm}0.37{\mu}m$의 특성을 가진다.

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References

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