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8 July 2003 OCT resolution enhancement using long-period fiber grating and erbium-doped fiber
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We proposed a technique to improve OCT resolution using LPG and EDF. The proposed technique improves the resolution of OCT by resphaping the spectrum of ASE source into Gaussian-like form. The ASE source has a strong characteristic peak due to erbium that is used for doping material in EDF. To reduce the peak-induced artifact to OCT image that may degrade image quality and distort inner structure information, LPG is used as a strong ASE peak rejection filter and EDF does a function of absorber when pumping power is not applied. Both of them can do spectral tailoring function properly so that modified source shape and sidelobe suppression can be performed. With the LPG-assisted reshaping, we have enhanced the spatial resolution up to 5 times (approximately 200 μm resolution was reduced to about 40 μm). With EDF absorber, we can obtain reshaped ASE source hence resolution was enhanced from 25 μm to less than 20 μm). The spatial resolution can be further enhanced by using cascaded LPGs or control of EDF parameters such as doping material, doping concentration, and the length of used EDF.
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EunSeo Choi, Young-Jae Kim, Myoung Jin Kim, Changsu Lee, and Byeong Ha Lee "OCT resolution enhancement using long-period fiber grating and erbium-doped fiber", Proc. SPIE 4956, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine VII, (8 July 2003);

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