Browsing by Author "Lee, Cheng-Ling"

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Optimization correction of spectral distortion for superimposed DWDM multichannel fiber Bragg grating filters
(2009)
Hsin, Chen-Wei
;
Lee, Cheng-Ling
;
Hsu, Kuei-Chu
;
Lai, Yinchieh
;
光電工程學系
Optimization correction of spectral distortion for superimposed DWDM multichannel fiber Bragg grating filters is performed with a hybrid Lagrange multiplier optimization algorithm to enable fast convergence as well as to retain the easy-fabrication merits.
Spectral Response of Long Period Fiber Grating based on Tapered Fiber with Side-Contacted Metal Grating
(2008)
Hsu, Kuei-Chu
;
Chen, Nan-Kuang
;
Lee, Cheng-Ling
;
Jhuang, Pei-Jhen
;
Chih, Yu-Syun
A simple long-period fiber grating structure using a tapered fiber side-contacted with a metal grating is proposed and demonstrated. The temperature/index tuning sensitivity can be enhanced and the un-usual spectral response of decreasing phase-matching wavelength with respect to increasing temperature has been observed.
Spectral Response of Long-Period Fiber Grating Based on Tapered Fiber With Side-Contacted Metal Grating
(2010-04-01)
Hsu, Kuei-Chu
;
Chen, Nan-Kuang
;
Lee, Cheng-Ling
;
Chih, Yu-Syun
;
Jhuang, Pei-Jhen
A new long-period fiber grating structure based on a tapered fiber side contacted with a metal grating is proposed and demonstrated in this paper. The temperature/ index tuning sensitivity can be enhanced, and the unusual spectral response of decreasing phase-matching wavelength with respect to increasing grating period and temperature is observed.
Wideband tunable wavelength-selective coupling in asymmetric side-polished fiber coupler with dispersive interlayer
(2007-12-24)
Chen, Nan-Kuang
;
Lee, Cheng-Ling
;
Chi, Sien
;
光電工程學系
;
Department of Photonics
We demonstrate tunable highly wavelength-selective filter based on a 2 x 2 asymmetric side-polished fiber coupler with dispersive interlayer in one of the coupling arms. The asymmetric fiber coupler is made of two side-polished fibers using identical single-mode fibers and one of the polished fibers is further chemically etched at the central evanescent coupling region to gain closer to the core. An optical liquid with different dispersion characteristics than that of silica fiber is used to fill up the etched hollow and therefore the propagation constant for the polished fiber with dispersive liquid becomes more dispersive and crosses with that of another untreated polished fiber. The location of the cross point and the cross angle between two propagation constant curves determine the coupling wavelength and coupling bandwidth as well as channel wavelength separation, respectively. The coupling wavelength can be tuned at least wider than 84 nm (1.326-1.410 mu m) under index variation of 0.004 and with coupling ratios of higher than 30 dB. (c) 2007 Optical Society of America.