Wavelength-Filter Based Spectral Calibrated Wave number – Linearization in 1.3 mm Spectral Domain Optical Coherence
Ruchire Eranga Henry Wijeisnghe1, Nam Hyun Cho2, Kibeom Park3, Yongseung Shin4, Jeehyun Kim5
1Ruchire Eranga Henry Wijeisnghe, Department of Electronics Engineering, Kyungpook National University, Daegu, South Korea.
2Kadhum Abboud, Department, of Software Engineering Mustansiriya University, Iraq.
3Kibeom Park, Department of Electronics Engineering, Kyungpook National University, Daegu, South Korea.
4Yongseung Shin, Department of Electronics Engineering, Kyungpook National University, Daegu, South Korea.
5Jeehyun Kim, Department of Electronics Engineering, Kyungpook National University, Daegu, South Korea.
Manuscript received on November 23, 2013. | Revised Manuscript received on December 15, 2013. | Manuscript published on December 30, 2013. | PP: 336-340 | Volume-3, Issue-2, December 2013. | Retrieval Number: B2483123213/2013©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
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.
Keywords: SD-OCT, Wavelength-filter, wavenumber-lineari zation.