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收集所有交通大學研究人員與學生個人或團體所發表之各項學術著作，涵蓋期刊論文、教師專書、學位論文等項。;;Collections of Publications of NCTU Researchers and Students Like Journal Papers and Thesis.

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🏛️國立陽明交通大學機構典藏

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Now showing 1 - 5 of 5
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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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    A 110 GHz passive mode-locked fiber laser based on a nonlinear silicon-micro-ring-resonator
    (2014-06-01)
    Yang, Ling-Gang
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    Jyu, Siao-Shan
    ;
    Chow, Chi-Wai
    ;
    Yeh, Chien-Hung
    ;
    Wong, Chi-Yan
    Mode-locked fiber lasers have many important applications in science and engineering. In this work, we demonstrate for the first time a 110 GHz high repetition rate mode-locked fiber laser using a silicon-based micro-ring resonator (SMRR) to act as an intra-cavity optical comb filter, as well as an optical nonlinear element. No electrical bias for the SMRR is required to reduce free carrier absorption. The SMRR has a free spectral range of 0.88 nm, enforcing laser mode-locking at the 110 GHz high rate. The optical nonlinearity of the SMRR also supports the dissipative four-wave mixing effect for generating the mode-locked optical pulse trains. The mode-locked pulse-width, optical 3 dB spectral bandwidth and the time-bandwidth product (TBP) are experimentally measured under different pump currents to the erbium-doped fiber-amplifier module inside the laser cavity. The relative intensity noise and the line-width of the proposed laser are also evaluated. Furthermore, a long-term monitoring is performed. The experimental results show that the optical pulse train generated by the SMRR-based mode-locked fiber laser has a 2.6 ps pulse-width (pump current at 400 mA) at a 110 GHz high repetition rate, narrow line-width (1 kHz), high stability (under observation of an hour), and nearly Gaussian transform-limited (TBP is 0.455).
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    Demonstration of a self-injected Fabry-Perot laser for dual-wavelength tuning together with different mode-spacing
    (2014-06-01)
    Yeh, Chien-Hung
    ;
    Chow, Chi-Wai
    ;
    Wu, Yu-Fu
    ;
    Lu, Shao-Sheng
    ;
    光電工程學系
    In this demonstration, we experimentally investigate a dual-ring fiber laser architecture to achieve dual-wavelength-tunable by utilizing the self-injected Fabry-Perot laser diode (FP-LD) mechanism. Here, two tunable bandpass filters (TBFs) are utilized in the proposed laser structure to obtain the dual-wavelength with single-longitudinal-mode (SLM). The different mode-spacing of the proposed dual-wavelength fiber laser can also be tuned between 20.8 and 1.3 nm, due to the effective gain amplification of FP-LD. Moreover, we can employ the different FP-LDs with various gain distributions to achieve wide wavelength range tuning.
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    Use of a reflective semiconductor optical amplifier and dual-ring architecture design to produce a stable multi-wavelength fiber laser
    (2014-05-01)
    Yeh, Chien-Hung
    ;
    Chow, Chi-Wai
    ;
    Lu, Shao-Sheng
    ;
    光電工程學系
    ;
    Department of Photonics
    In this work, we propose and demonstrate a multi-wavelength laser source produced by utilizing a C-band reflective semiconductor optical amplifier (RSOA) with a dual-ring fiber cavity. Here, the laser cavity consists of an RSOA, a 1 x 2 optical coupler, a 2 x 2 optical coupler and a polarization controller. As a result, thirteen to eighteen wavelengths around the L band could be generated simultaneously when the bias current of the C-band RSOA was driven at 30-70 mA. In addition, the output stabilities of the power and wavelength are also discussed.
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    S-band pulse generation by polarization additive-pulse mode-locking in an erbium-doped all-fiber ring laser
    (2014-01-01)
    Yang, Ling-Gang
    ;
    Jyu, Siao-Shan
    ;
    Chow, Chi-Wai
    ;
    Yeh, Chien-Hung
    ;
    Lai, Yinchieh
    An all-fiber S-band mode-locked Er-doped fiber ring laser operated at 1503 nm is experimentally demonstrated by utilizing the polarization additive-pulse mode-locking (P-APM) mechanism. To the best of our knowledge, it is the first P-APM mode-locked fiber laser operating in the S-band. The gain medium is an S-band Er-doped fiber amplifier (EDFA) composed of two Er-doped fiber stages with the technique of depressed-cladding to cut off the fundamental mode. Stable single-pulse operation is achieved within the available pump power range. Besides, characterization of the S-band EDFA module, such as the wavelength dependences of the gain and noise figure, the slope efficiency, as well as the dependence of the pump power on the gain for different input powers is performed. In addition, analysis of the proposed S-band mode-locked fiber laser, such as the pump power dependence of the pulse-width and optical bandwidth, and pulse-width compression is also provided.