Browsing by Author "Sheu, LG"

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A simple dispersion measurement of fiber gratings by interferometric technique
(2006-01-01)
Sheu, LG
;
Chen, JM
;
Yu, SY
;
Hsu, KC
;
Tsai, MC
A simple dispersion measurement of fiber gratings using an un-balanced Michelson interferometer is proposed. A broadband source and an optical spectrum analyzer are used to scan the interference spectrum, and then the group time delay can be obtained rapidly by Fourier transform processing the interference spectrum. We measured the group time delays of a uniform-period FBG, a chirped FBG, an arrayed-waveguide grating interleaver, and a thin-film filter type OADM by an un-balanced Michelson and Mach-Zehnder interferometers, respectively. The experimental results excellent match the measured results of the optical network analyzer. The experimental repeatability is shown to be better than 1ps.
Complex fiber grating structures fabricated by sequential writing with polarization control
(2004-02-15)
Chu, KP
;
Lai, YC
;
Sheu, LG
;
光電工程學系
;
Department of Photonics
We propose a flexible method for fabricating complex fiber grating structures based on sequential writing for fiber gratings with polarization control of the UV source beam. Pure apodized as well as arbitrary phase-shifted fiber Bragg gratings (FBGs) can be fabricated in a single scan. Experimental examples of raised-cos(2) apodized and dispersionless FBG filters are given to demonstrate the feasibility of this method. (C) 2004 Optical Society of America.
Fiber bragg grating dispersion compensator by single-period overlap-step-scan exposure
(2003-07-01)
Sheu, LG
;
Chuang, KP
;
Lai, YC
;
光電工程學系
;
Department of Photonics
We theoretically demonstrate that a high-quality fiber Bragg grating dispersion compensator can be fabricated by a properly designed single-period overlap-step-scan exposure method. A practical design example and a detailed tolerance analysis of this new fabrication method are given.
Fiber Bragg grating sequential UV-writing method with real-time interferometric side-diffraction position monitoring
(2005-05-16)
Hsu, KC
;
Sheu, LG
;
Chuang, KP
;
Chang, SH
;
Lai, YC
This work presents a new sequential UV-writing procedure for fabricating long fiber Bragg grating (FBG) devices. To real-time accurately align the position of every exposed FBG section prior to UV exposure, a single-period reference fiber grating with strong refractive index modulation is probed by applying an interferometric side-diffraction method to measure the grating phase as the position reference. In this way the overlapped FBG sections can be connected section-by-section without obvious phase errors, even when the written index-modulation is weak. (C) 2005 Optical Society of America.
Pure apodized phase-shifted fiber Bragg gratings fabricated by a two-beam interferometer with polarization control
(2004-03-01)
Chuang, KP
;
Lai, YC
;
Sheu, LG
;
光電工程學系
;
Department of Photonics
A new technique based on a two-beam interferometer with polarization control for fabricating advanced fiber Bragg grating (FBG) devices is demonstrated. By simultaneously rotating the angle of the half-wave plate, pure apodized and pi-phase-shifted FBGs can be fabricated in a single scan.