Optical amplification of the signal and sensitivity of the ultrafast spectral domain optical coherence tomography at an A-scan rate of 10MHz in a wavelength region of 1300nm

D. Choi; H. Hiro-oka; K. Shimizu; K. Ohbayashi

doi:10.1117/12.906536

30 January 2012 Optical amplification of the signal and sensitivity of the ultrafast spectral domain optical coherence tomography at an A-scan rate of 10MHz in a wavelength region of 1300nm

D. Choi, H. Hiro-oka, K. Shimizu, K. Ohbayashi

Author Affiliations +

Proceedings Volume 8213, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XVI; 82131F (2012) https://doi.org/10.1117/12.906536
Event: SPIE BiOS, 2012, San Francisco, California, United States

Abstract

We report on detailed characterization of a newly developed ultra-high speed optical coherence tomography (OCT) system using arrayed wave guide at 1.3 μm. An axial resolution of 27 μm, a depth range of 3.98 mm, and a detection speed of 2.5 or 10 MHz axial scan per second have been achieved. We also discuss the effectiveness of a semiconductor optical amplifier (SOA) in the system. The system sensitivity without SOA was about 78 dB, which is far less than the shot-noise-limited sensitivity because of relative intensity noise and loss of optical intensity in the system. To improve the low sensitivity, we used the SOA in the system and achieved a sensitivity of 94 dB with a probe power of 10 mW, which allowed us good imaging quality in biomedical applications. The OCT system is also capable to display a volumetric tomography continuously in real time by using field programmable gate arrays (FPGA) and general purpose graphical processing unit (GPGPU) for high-speed parallel data processing. We present several tissue images such as human finger skin, finger near nail and extracted trachea of a pig.

Citation Download Citation

D. Choi, H. Hiro-oka, K. Shimizu, and K. Ohbayashi "Optical amplification of the signal and sensitivity of the ultrafast spectral domain optical coherence tomography at an A-scan rate of 10MHz in a wavelength region of 1300nm", Proc. SPIE 8213, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XVI, 82131F (30 January 2012); https://doi.org/10.1117/12.906536

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KEYWORDS

Optical coherence tomography

Point spread functions

Field programmable gate arrays

3D image processing

Data acquisition

Data processing

Skin

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