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🏛️國立陽明交通大學機構典藏

Author: search.filters.author.Chen, Jing-HengSubject: search.filters.subject.fiber optics

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Now showing 1 - 6 of 6
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    Stable and Wavelength-Tunable Self-Injected Reflective Semiconductor Optical Amplifier-Based Fiber Laser
    (2015-08-01)
    Wu, Yu-Fu
    ;
    Yeh, Chien-Hung
    ;
    Chow, Chi-Wai
    ;
    Sung, Jiun-Yu
    ;
    Chen, Jing-Heng
    In this investigation, we propose and demonstrate a stable and wavelength-tunable self-injected reflective semiconductor optical amplifier (RSOA)-based laser by using the Faraday rotator mirror (FRM) and the fiber mirror (FM) serving as a reflected element, respectively. Here, a 1.2-GHz RSOA can be enhanced to similar to 3 GHz by utilizing a self-injected mechanism. In the measurement, applying the optical orthogonal frequency-division multiplexing quadrature amplitude modulation (OFDM-QAM) with a bit-loading algorithm on the self-injected RSOA directly, the proposed laser can achieve a 3.5-Gb/s data rate in a 20-km single-mode-fiber transmission below a forward error correction (FEC) threshold. Moreover, the related output performance of the proposed RSOA-based laser is also discussed, whereas the FRM and the FM are utilized for comparisons.
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    Use of proper cavity loss for a stable single-longitudinal-mode erbium fiber laser
    (2017-06-01)
    Yeh, Chien-Hung
    ;
    Zhuang, Yuan-Hong
    ;
    Tsai, Ning
    ;
    Chow, Chi-Wai
    ;
    Chen, Jing-Heng
    A stable and selectable erbium-doped fiber (EDF) ring laser configuration with single-longitudinal-mode (SLM) output is proposed and demonstrated in this paper. In the proposed laser scheme, a proper cavity loss is utilized for significant suppression of the side mode. In the experiment, the different coupling ratios required to produce various cavity losses in the proposed fiber laser are analyzed. Here, to reach the wavelength selection, several fiber Bragg gratings (FBGs) and an optical tunable bandpass filter (OTBF) in the C-band range are employed for demonstration. In addition, the output performance with respect to stability and SLM in the proposed EDF ring laser are also investigated simultaneously.
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    Switchable dual-wavelength single-longitudinal-mode erbium fiber laser utilizing a dual-ring scheme with a saturable absorber
    (2018-06-01)
    Yang, Zi-Qing
    ;
    Huang, Tzu-Jung
    ;
    Chang, Yao-Jen
    ;
    Yeh, Chien-Hung
    ;
    Chow, Chi-Wai
    In this work, we propose and demonstrate a switchable dual-wavelength erbium-doped fiber (EDF) ring laser with stable single-longitudinal-mode (SLM) output. Here, a dual-ring (DR) structure with an unpumped EDF of 2 m is designed to achieve SLM oscillation. Five fiber Bragg gratings (FBGs) are applied in the laser cavity serving as the reflective element to generate different dual-wavelength outputs. In the measurement, six sets of generated dual-wavelengths with various mode-spacing (Delta lambda) can be achieved via the five FBGs. Additionally, the stability performance of the proposed EDF DR laser is also demonstrated.
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    Smart architecture for stable multipoint fiber Bragg grating sensor system
    (2017-12-01)
    Yeh, Chien-Hung
    ;
    Tsai, Ning
    ;
    Zhuang, Yuan-Hong
    ;
    Huang, Tzu-Jung
    ;
    Chow, Chi-Wai
    In this work, we propose and investigate an intelligent fiber Bragg grating (FBG)-based sensor system in which the proposed stabilized and wavelength-tunable single-longitudinal-mode erbium-doped fiber laser can improve the sensing accuracy of wavelength-division-multiplexing multiple FBG sensors in a longer fiber transmission distance. Moreover, we also demonstrate the proposed sensor architecture to enhance the FBG capacity for sensing strain and temperature, simultaneously.
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    Wavelength-selectable and steady single-mode erbium-doped fiber multiple ring laser
    (2017-11-01)
    Yeh, Chien-Hung
    ;
    Yang, Zi-Qing
    ;
    Huang, Tzu-Jung
    ;
    Chow, Chi-Wai
    ;
    Chen, Jing-Heng
    To achieve a stable and selectable C-band erbium-doped fiber (EDF) laser with single-longitudinal-mode output, a multiple ring architecture is proposed and demonstrated experimentally. In this work, we design a passively quadruple-ring structure in the cavity of an EDF laser to produce a Vernier effect with a mode filter for suppressing the multimode spikes significantly. In addition, the output performance and stability of the proposed EDF ring laser are discussed.
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    Utilizing dual-pass composite-ring architecture for a stabilized and wavelength-selectable single-longitudinal-mode erbium-doped fiber laser
    (2016-10)
    Yeh, Chien-Hung
    ;
    Zhuang, Yuan-Hong
    ;
    Tsai, Ning
    ;
    Chen, Jing-Heng
    ;
    Chow, Chi-Wai
    In this paper, we propose using a dual-pass composite-ring construction for a stable and wavelength-tunable erbium-doped fiber (EDF) laser with a single-longitudinal-mode (SLM) output. According to the proposed laser architecture, a flattened output power spectrum within a 0.57 dB power variation can be obtained in the tuning range of 1530 to 1560 nm. In addition, the measured optical signal-to-noise ratio (OSNR) of each output wavelength can be larger than 62.1 dB. Furthermore, a stable and tunable dual-wavelength output of the proposed EDF laser scheme can also be achieved in the same operation range by using two optical filters inside a ring cavity. Here, the maximum and minimum mode spacing of dual-wavelength lasing in the proposed EDF laser are 28.01 and 1.04 nm, respectively. In this measurement, the SLM performance and output stability of the proposed EDF laser are analyzed and discussed experimentally.