Spectrally Equalized Frequency Comb Generation in Multistage Parametric Mixer With Nonlinear Pulse Shaping
Spectrally Equalized Frequency Comb Generation in Multistage Parametric Mixer With Nonlinear Pulse Shaping
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DOI：
10.1109/jlt.2013.2287852
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发表时间：
2014-02-15
影响因子：
4.7
通讯作者：
Radic, Stojan
中科院分区：
文献类型：
--
作者：
Ataie, Vahid;Myslivets, Evgeny;Radic, Stojan
提出了一种改善宽带参数频率梳平坦度的新方法。该方法依赖于梳状产生装置参数混合前的非线性脉冲整形。以连续波激光作为梳粒，在无腔多级冲击波混频器中产生参数梳粒。脉冲整形在包含非线性光学/放大环镜（NOLM/NALM）的再生阶段完成，并为输出混合阶段的频谱均衡频率梳生成提供了接近理想的种子。新技术分别在两个粗（100ghz）和密（10ghz）的梳状发生器上实现。宽频梳在100 nm范围内的平坦度为4 dB，而细频梳在120 nm范围内的平坦度为1500音调，低于2 dB。
A novel approach to improve the flatness of wideband parametric frequency combs is presented. The method relies on nonlinear pulse shaping prior to parametric mixing in a comb-generating device. The parametric comb is generated in a cavity-less multistage shock-wave mixer, using continuous-wave (CW) laser as comb seed. The pulse shaping is accomplished in a regenerative stage incorporating nonlinear optical/amplifying loop mirror (NOLM/NALM) and provides near-ideal seeds for spectrally equalized frequency comb generation in the output mixing stage. The new technique was implemented separately on two comb generators with a coarse (100 GHz) and dense (10 GHz) tone spacing. A 4 dB flatness over 100 nm is achieved with wide-pitched comb, while the fine-pitched device yielded 1500 tones and possessed sub-2 dB spectral flatness over 120 nm bandwidth.