Browsing by Author "Chou, Sen-Yih"

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Analysis of Thermo-Optic Tunable Dispersion-Engineered Short-Wavelength-Pass Tapered-Fiber Filters
(2009-07-01)
Chou, Sen-Yih
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Hsu, Kuei-Chu
;
Chen, Nan-Kuang
;
Liaw, Shien-Kuei
;
Chih, Yu-Syun
Thermo-optic tunable short-wavelength-pass tapered-fiber filters based on fundamental-mode cutoff mechanism are realized experimentally and analyzed theoretically. The effects of material and waveguide dispersion are investigated and the optimal tapered fiber structures for attaining high-spectral cutoff slope and high-rejection efficiency are determined.
Bandpass Filter With Variable Bandwidth Based on a Tapered Fiber With External Polymer Cladding
(2009-07-01)
Hsu, Kuei-Chu
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Chen, Nan-Kuang
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Chou, Sen-Yih
;
Liaw, Shien-Kuei
;
Lai, Yinchieh
A thermo-optical bandwidth-variable fiber-based bandpass filter is experimentally and theoretically demonstrated by simply utilizing a tapered standard single-mode fiber covered with a dispersive polymer layer. The 3-dB spectral bandwidth can be tuned from 250 to 500 nm with the filter center wavelength around 1 mu m.
Bandwidth-Variable Bandpass Filter based on Dispersion Engineered Tapered Fiber with External Polymer Cladding
(2009)
Hsu, Kuei-Chu
;
Chen, Nan-Kuang
;
Chou, Sen-Yih
;
Liaw, Shien-Kuei
;
Lai, Yinchieh
A simple thermo-optic bandwidth-variable fiber-based bandpass filter is demonstrated by using a tapered standard single mode fiber covered with a dispersive polymer layer. The 3 dB spectral bandwidth can be tuned from 250 rim with a Gaussian shape to 500 nm with a flat-top shape. (C) 2008 Optical Society of America
Projection moire profilometry with high-dynamic range image
(2012-02-01)
Chou, Sen-Yih
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Cho, Chia-Hung
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Du, Ming-Jhe
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Chi, Sien
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光電工程學系
As a type of optical measuring apparatus, the charge-coupled diode (CCD) camera provides the capability of increasing the speed of measurement by inspecting an area with only one shot. However, the CCD camera's high-variation range of reflectivity presents an exceptional challenge for the optical measurement established on the surface. We present a method that could enable one to acquire an image with a high-dynamic range in one shot without any reduction in spatial resolution. Because of the sufficient signal-to-noise ratio, the method presented could perform the robustness of the phase-retrieving algorithm, and the surface topography could be measured more accurately. (C) 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.OE.51.2.021112]
Wideband tunable Gaussian-shaped spectral filters based on dispersion engineering
(2009-08-01)
Hsu, Kuei-Chu
;
Chen, Nan-Kuang
;
Chou, Sen-Yih
;
Liaw, Shien-Kuei
;
Lai, Yinchieh
Optical liquids can be used to engineer the dispersion characteristics of fibers by serving as the core or cladding to attain fundamental-mode cutoff effect. The short-/long-pass fiber filters are so made and concatenated to achieve widely thermo-optic tunable Gaussian-shaped spectral filters. The proposed wideband tunable Gaussian-shaped spectral filter provides a potential technique in application to high resolution bio-imaging. (C) 2009 Elsevier Inc. All rights reserved.