Characterization of wavelength-swept active mode locking fiber laser based on reflective semiconductor optical amplifier
Characterization of wavelength-swept active mode locking fiber laser based on reflective semiconductor optical amplifier
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DOI：
10.1364/oe.19.014586
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发表时间：
2011-07-18
期刊：
影响因子：
3.8
通讯作者：
Kim, Chang-Seok
中科院分区：
文献类型：
--
作者：
Lee, Hwi Don;Lee, Ju Han;Kim, Chang-Seok
从时域和波长两个方面分析了扫频主动锁模光纤激光器的静态和动态特性。实验表明，在锁模条件下，激光光谱的线宽和扫描波长的带宽直接取决于光纤腔的长度和色散以及调制频率和扫描速率。为了获得更窄的线宽，需要同时具有更长的光纤腔长度和更高的色散以及更高的锁模条件。对于较宽的带宽，使用较低的调制频率需要较低阶的锁模条件。动态扫描性能也进行了实验分析，以确定其适用于光学相干层析成像。结果表明，较短的光纤腔长度可以增加自由光谱范围，从而提高最大扫描速率。采用反射式半导体光放大器（RSOA）提高调制和色散效率。总的来说，由于在波长扫描机构中缺乏机械限制，可以使用三角形电信号代替正弦信号以高扫描速率扫描激光波长。(C)2011年美国光学学会
The static and dynamic characteristics of a wavelength-swept active mode locking (AML) fiber laser are presented in both the time-region and wavelength-region. This paper shows experimentally that the linewidth of a laser spectrum and the bandwidth of the sweeping wavelength are dependent directly on the length and dispersion of the fiber cavity as well as the modulation frequency and sweeping rate under the mode-locking condition. To achieve a narrower linewidth, a longer length and higher dispersion of the fiber cavity as well as a higher order mode locking condition are required simultaneously. For a broader bandwidth, a lower order of the mode locking condition is required using a lower modulation frequency. The dynamic sweeping performance is also analyzed experimentally to determine its applicability to optical coherence tomography imaging. It is shown that the maximum sweeping rate can be improved by the increased free spectral range from the shorter length of the fiber cavity. A reflective semiconductor optical amplifier (RSOA) was used to enhance the modulation and dispersion efficiency. Overall a triangular electrical signal can be used instead of the sinusoidal signal to sweep the lasing wavelength at a high sweeping rate due to the lack of mechanical restrictions in the wavelength sweeping mechanism. (C) 2011 Optical Society of America