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Effect of linewidth enhancement factor in actively mode-locked ring laser

机译：线宽增强因子在主动锁模环形激光器中的作用

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Fundamental performance of the swept-source optical coherence tomography (SS-OCT) system is defined by its wavelength-swept laser. Especially narrower instantaneous spectral linewidth of the laser has the advantage in deep-range tomography. We have demonstrated narrow-linewidth actively mode-locked ring lasers (AMLL), employing anomalous dispersion configuration. The linewidth of an AMLL is determined by anomalous dispersion and self-phase modulation (SPM) in the semiconductor optical amplifier (SOA). For such soliton-like phenomenon of AMLLs, numerical calculation predicts that both of large dispersion and small SPM make the linewidth narrower. Since the dispersion restricts wavelength sweeping range of AMLLs, too large dispersion cannot be used. To weaken the SPM effect, low linewidth enhancement factor a of SOA is desirable. Quantum-dot(QD)-based SOA offers low a-factor in comparison with quantum-well SOA (QWSOA). In this study, we employ a QDSOA as a gain medium in an AMLL and also use a QWSOA for comparison. The wavelength band of the QWSOA-AMLL is 1.5 μm and that of QDSOA-AMLL is 1.0 μm. Since we employed the 10 psm of net dispersion in both configurations, the dispersion parameter β2 for the QDSOA-AMLL is approximately half of that for the QWSOA-AMLL. The measured full-width half-maximum (FWHM) linewidths in a static state were 0.08 nm for the QWSOA-AMLL and 0.04nm for the QDSOA-AMLL. In spite of the small β2 the QDSOA-AMLL achieves narrower spectral than the QWSOA-AMLL. We also confirmed that the interference signal was improved by adopting the QDSOA.
机译：扫频光学相干断层扫描（SS-OCT）系统的基本性能由其扫频激光器确定。激光器的特别窄的瞬时光谱线宽在深层层析成像中具有优势。我们已经证明了采用异常色散配置的窄线宽有源锁模环形激光器（AMLL）。 AMLL的线宽由半导体光放大器（SOA）中的异常色散和自相位调制（SPM）确定。对于这样的类似于AMLL的孤子现象，数值计算表明，大的色散和小的SPM都会使线宽变窄。由于色散限制了AMLL的波长扫描范围，因此不能使用太大的色散。为了减弱SPM效应，SOA的低线宽增强因子α是期望的。与量子阱SOA（QWSOA）相比，基于量子点（QD）的SOA提供了较低的a因子。在这项研究中，我们将QDSOA用作AMLL中的增益介质，还使用QWSOA进行比较。 QWSOA-AMLL的波长带为1.5μm，QDSOA-AMLL的波长带为1.0μm。由于我们在两种配置中均采用10 ps / nm的净色散，因此QDSOA-AMLL的色散参数β2约为QWSOA-AMLL的一半。静态下测得的全宽半最大（FWHM）线宽对于QWSOA-AMLL为0.08 nm，对于QDSOA-AMLL为0.04nm。尽管β2小，但QDSOA-AMLL的光谱比QWSOA-AMLL的光谱窄。我们还确认通过采用QDSOA可以改善干扰信号。

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