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20 February 2006 Realization of fiber-based OCT system with broadband photonic crystal fiber coupler
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We implemented a fiber-based optical coherence tomography (OCT) system by using a photonic crystal fiber (PCF) coupler which could support an ultra-wideband spectral bandwidth. The PCF coupler fabricated by the fused biconical tapered (FBT) method showed rather flat coupling efficiency over a broad spectral bandwidth. Furthermore, the mode-field shapes at the output ports of the PCF coupler showed single mode characteristic over a wideband range. These features will enable the OCT system to operate at 1300 nm as well as at 800 nm without changing the coupler. The FWHM of the interferogram was measured to be about 3 um when a white-light source was used. While a Ti:Sapphire laser and a conventional superluminescent diode (SLD) produced interferograms with FWHMs of about 4 um and 15 um, respectively. The OCT imaging performance of the PCF-based OCT system was demonstrated by imaging an in vitro rat eye and Misgurnus mizolepis skin with a SLD source at 1300 nm and by imaging a tooth with a Ti:Sapphire laser source at 800 nm. The PCF coupler might enable the utilization of an ultra-wideband supercontinuum generated light source in fiber-optic OCT systems for obtaining high resolution, and also realization of a white-light source as a cost effective solution for fiber-based high-resolution OCT systems. Further, this coupler also can operate as single mode not only near 1000 nm but also near 500 nm wavelengths. This feature may support realization of fiber based second harmonic (SH) OCT system.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Seon Young Ryu, Jihoon Na, Hae Young Choi, Woo Jun Choi, Byeong Ha Lee, and Gil-Ho Yang "Realization of fiber-based OCT system with broadband photonic crystal fiber coupler", Proc. SPIE 6079, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine X, 60791N (20 February 2006);

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