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Author: search.filters.author.Tseng, HYSubject: search.filters.subject.fiber Bragg grating

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Now showing 1 - 7 of 7
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    Power-equalized parallel-type pump-shared fiber lasers based on parameter-adjustment
    (1999-11-01)
    Tseng, HY
    ;
    Liaw, SK
    ;
    Chi, S
    ;
    光電工程學系
    ;
    Department of Photonics
    A parallel-type, pump-shared (PTPS) scheme linear-cavity laser array (LCLA) is proposed and numerically studied. Power-equalization of multiwavelength fiber lasers can be achieved by varying the pumping power ratio, length of the erbium-doped fiber or reflectivity of grating reflector for the individual channels. Before and after power-equalization, the maximum power variation among seven equal-spaced channels, ranging from 1530 to 1560 nm, is 5.8 and 0.2 dB, respectively. (C) 1999 Elsevier Science B.V. All rights reserved.
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    Fiber-grating-based optical limiting amplifier module for dual-wavelength, hybrid data rate transmission
    (2000)
    Liaw, SK
    ;
    Chi, S
    ;
    Tseng, HY
    ;
    光電工程學系
    ;
    Department of Photonics
    A multichannel fiber-grating-based optical limiting amplifier module is proposed Dual-wavelength, hybrid data rate transmission is demonstrated with 30 dB input dynamic range. For 5.0 and 25 Gbit/s dual-channel transmission in a 200 km single-mode fiber, power penalty due to gain competition between channels and backreflection noise is less than 0.6 dB compared to the receiver sensitivity of 0 km, 5.0 Gbit/s single-channel operation.
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    Parallel pump-shared linear cavity laser array using 980-nm pump reflectors or N pieces of gain fibers as self-equalizers
    (2000-01-01)
    Liaw, SK
    ;
    Tseng, HY
    ;
    Chi, S
    ;
    光電工程學系
    ;
    Department of Photonics
    By using fiber gratings as pump reflectors with various reflectivities or N pieces of gain fibers with various lengths externally to linear cavity as self-equalizers, a parallel-type, pump-shared linear cavity laser array (LCLA) is proposed and numerically studied, The average output power is increased and the maximum power variation among channels is reduced from 7.2 to less than 0.1 dB when the reflectivity of each pump reflector or the length of each gain fiber is adjusted appropriately.
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    Ultrashort bragg soliton in a fiber bragg grating
    (2002-05-15)
    Chi, S
    ;
    Luo, B
    ;
    Tseng, HY
    ;
    光電工程學系
    ;
    Department of Photonics
    The propagation of a nonlinear ultrashort pulse in a photonic bandgap structure is investigated by using the finite-difference time-domain method. The simulation results show that an ultrashort pulse near the bandgap edge can propagate through a nonlinear fiber Bragg grating, even if the broadband spectrum of this ultrashort pulse overlaps the whole forbidden band of the grating. It is also shown that the time delay of such an ultrashort solitary wave is proportional to its detuning wavelength from the exact Bragg resonance. (C) 2002 Published by Elsevier Science B.V.
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    High-resolution fiber Bragg grating sensor system using linear-cavity fiber laser scheme
    (2002-09-05)
    Peng, PC
    ;
    Tseng, HY
    ;
    Chi, S
    ;
    光電工程學系
    ;
    Department of Photonics
    A high-resolution fiber Bragg grating (FBG) sensor system using a linear-cavity fiber laser scheme is proposed and numerically studied. The proposed sensor system can improve the sensing accuracy by using a discriminating FBG pair in conjunction with a fiber laser scheme. This FBG sensor system can resolve the temperature up to 0.0005degreesC theoretically and can be applied for strain sensing and temperature sensing with high precision. (C) 2002 Wiley Periodicals, Inc.
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    Fiber-ring laser-based fiber grating sensor system using self-healing ring architecture
    (2002-12-20)
    Peng, PC
    ;
    Tseng, HY
    ;
    Chi, S
    ;
    光電工程學系
    ;
    Department of Photonics
    This paper presents a self-healing fiber grating sensor system and demonstrates its effectiveness. The self-healing function is constructed by using a primary ring architecture incorporated with several ring sub-networks. To enhance the sensing signal when a breakpoint suddenly occurs in the network, we employ a fiber-ring laser-based sensor system. The network survivability of an 11-point FBG sensor is experimentally examined. The proposed fiber grating sensor system can increase the reliability of a sensing network. (C) 2002 Wiley Periodicals, Inc.
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    A simple fiber-Bragg-grating sensor system based on a linear-cavity fiber laser
    (2003-04-05)
    Peng, PC
    ;
    Tseng, HY
    ;
    Chi, S
    ;
    光電工程學系
    ;
    Department of Photonics
    A simple fiber-Bragg-grating (FBG) sensor system based on a linear-cavity fiber laser is proposed and experimentally demonstrated. The lasing wavelength shift resulting from the temperature variation on this sensing element is discriminated by two FBGs. These two FBGs, acting as wavelength discriminators, are used to increase the real-time measurement range for monitoring the temperature variation. (C) 2003 Wiley Periodicals, Inc.