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RISS 인기검색어
- 검색키워드
- 저자 : Mudhana, G. (검색결과 5 건)
- 무료
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Mudhana, G,Kwan Seob Park,Seon Young Ryu,Byeong Ha Lee IEEE 2011 IEEE SENSORS JOURNAL Vol.11 No.5
<P>We report a fiber-optic sensor for measuring the refractive index (RI) of a liquid sample. The sensing probe is constructed from an extrinsic cavity formed by a micromirror and a lensed photonic crystal fiber (PCF) tip. We show that PCF lens with an unconventionally large radius of curvature is bifunctional; an effective reflector as well as a collimator and thus suitable for realizing long single-arm interferometers, with a cavity length of the order of few mm. A sensing head suitable for measuring the refractive index (RI) of liquids is constructed by encapsulating the bifunctional lens tip and a micromirror in a glass tube. A hole is made in the glass-tube to allow free-flow of the liquid sample in-and-out of the cavity. The cavity length was about 1 mm. The group index of the liquid samples is obtained from the Fourier peak position of the interference signal measured in wavelength with optical spectrometer. The RIs of distilled water, acetone and ethanol (at 829 nm, 20°C) were measured to be 1.32822, 1.35416, and 1.35715, respectively. The resolution of the sensor was analytically found to be 2.6 × 10<SUP>-5</SUP> and the response was experimentally shown to be linear.</P>
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Influence of Dissimilar Cores on the Mode-Coupling Dynamics of Multicore Fibers
Chan, F. Y. M.,Mudhana, G.,Byeong Ha Lee IEEE 2012 Photonics Technology Letters Vol.24 No.16
<P>We present a theoretical analysis of the mode-coupling dynamics of heterogeneous 6- and 7-core multicore fibers (MCFs). Simple analytical expressions for the mode amplitudes are derived, which highlight the effects of dissimilar cores on the coupling characteristics. Although power transfer is confined among the group of identical cores, the coupling within each group is significantly affected by the presence of neighboring dissimilar cores and is dependent on the propagation constants of the eigenmodes of the composite multicore structure. The dissimilar cores can enhance or mitigate the coupling effects by choosing appropriate design parameters. The formulas can serve as a basis for understanding the cross-talk of MCFs for more complicated cases involving longitudinal perturbations.</P>
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Choi, Hae Young,Mudhana, Gopinath,Park, Kwan Seob,Paek, Un-Chul,Lee, Byeong Ha The Optical Society 2010 Optics express Vol.18 No.1
<P>We propose and demonstrate a cross-talk free simultaneous measurement system for temperature and external refractive index (ERI) implemented by dual-cavity Fabry-Perot (FP) fiber interferometer. The sensing probe consists of two cascaded FP cavities formed with a short piece of multimode fiber (MMF) and a micro-air-gap made of hollow core fiber (HOF). The fabricated sensor head was ultra-compact; the total length of the sensing part was less than 600 mum. Since the reflection spectrum of the composite FP structures is given by the superposition of each cavity spectrum, the spectrum measured in the wavelength domain was analyzed in the Fourier or spatial frequency domain. The experimental results showed that temperature could be determined independently from the spatial frequency shift without being affected by the ERI, while the ERI could be also measured solely by monitoring the intensity variation in the spatial frequency spectrum. The ERI and the temperature sensitivities were approximately 16 dB/RIU for the 1.33-1.45 index range, and 8.9 nm/ degrees C at low temperature and 14.6 nm/ degrees C at high temperature, respectively. In addition, it is also demonstrated that the proposed dual-cavity FP sensor has potential for compensating any power fluctuation that might happen in the input light source.</P>
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Optical Delay Amplified by Chirped Fiber Bragg Gratings
Lee, Byeong-Ha,Mudhana, Gopinath Optical Society of Korea 2003 Current Optics and Photonics Vol.7 No.4
We report a novel optical delay line that can be implemented using only optical fiber and fiber devices without the need for any bulk-optic devices such as lens, prism, and moving mirror. The dispersive property of a chirped fiber Bragg grating (CFBG) is exploited to get the delay. The proposed delay line constitutes two identical CFBGs cascaded in the reverse order with one of them being strained. Analysis reveals that the small displacement or the strain applied on the CFBG is effectively amplified in the delay line by the ratio of the minimum resonant wavelength and the reflection bandwidth of the CFBG. The dispersion properties of the CFBG with and without the strain are analyzed in detail. The theoretical performance of the proposed delay line is also discussed. Applications of the proposed delay line are expected in the field of high-speed optical coherence tomograpy.
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Oh, K.-H.,Song, H.-J.,Moon, S.,Kim, T.-Y.,Mudhana, G.,Kim, W. B.,Kim, D.-Y.,Song, J.-I. Wiley Subscription Services, Inc., A Wiley Company 2005 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS - Vol.47 No.2
<P>Near-field patterns of uniplanar compact photonic bandgap (UC-PBG) and non-UCPBG finite-width conductor-backed coplanar waveguides (FW-CBCPWs) are characterized using an electro-optic near-field mapping system. This system is very effective in visually showing the role of the UC-PBG structure in the suppression of microstriplike (MSL) modes in the FW-CBCPWs. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 47: 119–122, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21098</P>
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