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🏛️國立陽明交通大學機構典藏

Access type: Open accessAuthor: search.filters.author.Jyu, Siao-Shan

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Now showing 1 - 7 of 7
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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
    ;
    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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    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.
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    250-GHz Passive Harmonic Mode-Locked Er-Doped Fiber Laser by Dissipative Four-Wave Mixing With Silicon-Based Micro-Ring
    (2013-10-01)
    Jyu, Siao-Shan
    ;
    Yang, Ling-Gang
    ;
    Wong, Chi-Yan
    ;
    Yeh, Chien-Hung
    ;
    Chow, Chi-Wai
    We propose and demonstrate a 250-GHz high-repetition-rate mode-locked Er-doped fiber laser, which utilizes a silicon micro-ring resonator (SMRR). The SMRR acts as an optical comb filter to help achieve passive mode-locking through the dissipative four-wave-mixing effect induced by a piece of high nonlinear fiber. A short section of polarization-maintaining fiber is inserted in the cavity to induce birefringence filtering to significantly enhance the stability of the proposed laser through the combined effects of optical filtering and nonlinear spectral broadening. The laser can operate about 2 and 6 nm in the case of 1.48-ps and 875-fs output pulsewidth, with 3-dB bandwidth, respectively. The laser can remain mode locked, during our measurement time, without any cavity length or temperature feedback control.
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    Laser dynamics of asynchronous rational harmonic mode-locked fiber soliton lasers
    (2013-08-01)
    Jyu, Siao-Shan
    ;
    Jiang, Guo-Hao
    ;
    Lai, Yinchieh
    ;
    光電工程學系
    ;
    Department of Photonics
    Laser dynamics of asynchronous rational harmonic mode-locked (ARHM) fiber soliton lasers are investigated in detail. In particular, based on the unique laser dynamics of asynchronous mode-locking, we have developed a new method for determining the effective active modulation strength in situ for ARHM lasers. By measuring the magnitudes of the slowly oscillating pulse timing position and central frequency, the effective phase modulation strength at the multiplication frequency of rational harmonic mode-locking can be accurately inferred. The method can be a very useful tool for developing ARHM fiber lasers.
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    Asynchronous Harmonic Mode Locking in an All-Normal Dispersion Yb-Doped Fiber Laser
    (2013-02-01)
    Wang, Sheng-Min
    ;
    Jyu, Siao-Shan
    ;
    Hsiang, Wei-Wei
    ;
    Lai, Yinchieh
    ;
    光電工程學系
    We present detailed experimental and theoretical results to demonstrate the possibility of asynchronous harmonic mode locking in an all-normal dispersion fiber laser. In contrast to asynchronous soliton mode-locking operation in the anomalous dispersion regime, more profound laser dynamics are found. The experimentally demonstrated 10-GHz asynchronous harmonic mode-locked Yb-doped fiber laser exhibits an excellent super-mode noise suppression ratio in the RF spectrum with picosecond output pulsewidth.
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    Characteristics of a low repetition rate passively mode-locked Yb-doped fiber laser in an all-normal dispersion cavity
    (2013-02-01)
    Lin, Ja-Hon
    ;
    Jhu, Jia-Liang
    ;
    Jyu, Siao-Shan
    ;
    Lin, Ting-Chun
    ;
    Lai, Yinchieh
    The lasing characteristics of a 365 kHz low repetition rate Yb-doped fiber laser operated in an all-normal dispersion cavity and mode-locked by the nonlinear polarization rotation mechanism are investigated in detail. As the pump power increases, the laser exhibits two transition routes when evolved from the continuous-wave (CW) state to the mode-locked (ML) state. In one evolution route the Q-switched mode-locked (QML) state is sandwiched between the CW and ML states, whereas in the other more interesting evolution route the hysteresis transition between the CW and ML states is found for the first time. Under the mode-locking operation, the laser generates sub-nanosecond pulses with linear dependence of pulsewidth on bandwidth under different pump powers, indicating the presence of giant linear chirps on the laser output pulses.
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    Fiber Dispersion Measurement With a Swept-Wavelength Pulse Light Source
    (2010-05-01)
    Jyu, Siao-Shan
    ;
    Liu, Shiou-Fong
    ;
    Hsiang, Wei-Wei
    ;
    Lai, Yinchieh
    ;
    光電工程學系
    A new fiber dispersion measurement method by utilizing a periodically swept-wavelength pulse light source is proposed and demonstrated. The periodic pulse timing variation of the pulse train induced by wavelength sweeping can be directly detected by a radio-frequency spectrum analyzer. Experiments by using an asynchronous mode-locked fiber soliton laser as the swept-wavelength pulse source have been successfully carried out to demonstrate the feasibility.