title: Wavelength-Filter Based Spectral Calibrated Wave number - Linearization in 1.3 mm Spectral Domain Optical Coherence.
abstract: In this study, we demonstrate the enhanced spectral calibration method for 1.3 μm spectral-domain optical coherence tomography (SD-OCT). The calibration method using wavelength-filter simplifies the SD-OCT system, and also the axial resolution and the entire speed of the OCT system can be dramatically improved as well. An externally connected wavelength-filter is utilized to obtain the information of the wavenumber and the pixel position. During the calibration process the wavelength-filter is placed after a broadband source by connecting through an optical circulator. The filtered spectrum with a narrow line width of 0.5 nm is detected by using a line-scan camera. The method does not require a filter or a software recalibration algorithm for imaging as it simply resamples the OCT signal from the detector array without employing rescaling or interpolation methods. One of the main drawbacks of SD-OCT is the broadened point spread functions (PSFs) with increasing imaging depth can be compensated by increasing the wavenumber-linearization order. The sensitivity of our system was measured at 99.8 dB at an imaging depth of 2.1 mm compared with the uncompensated case.
authors: Department of Electronics Engineering, Kyungpook National university, Daegu, South Korea.
authors: Ruchire Eranga Henry
authors: RE
authors: Wijeisnghe
authors: Department of Electronics Engineering, Kyungpook National university, Daegu, South Korea.
authors: Nam Hyun
authors: NH
authors: Cho
authors: Department of Electronics Engineering, Kyungpook National university, Daegu, South Korea.
authors: Kibeom
authors: K
authors: Park
authors: Department of Electronics Engineering, Kyungpook National university, Daegu, South Korea.
authors: Yongseung
authors: Y
authors: Shin
authors: Department of Electronics Engineering, Kyungpook National university, Daegu, South Korea.
authors: Jeehyun
authors: J
authors: Kim
keywords: SD-OCT; Wavelength-filter; wavenumber-linearization