Doumbia Yaya, Wolfersberger Delphine, Panajotov Krassimir, Sciamanna Marc
Opt Express. 2021 Oct 11;29(21):33976-33991. doi: 10.1364/OE.432281.
We investigate experimentally the nonlinear polarization dynamics of a VCSEL subject to optical injection of a frequency comb. By tuning the polarization of the injected comb to be orthogonal to that of the VCSEL, we demonstrate the generation of either a single polarization or a dual polarization frequency comb. The injection parameters (injected power and detuning frequency) are then used either to generate harmonics of the initial comb spacing or to increase the number of total output frequency lines up to 15 times the number of injected comb lines. Optimisation of the injection parameters yields a comb extending over 60 GHz for a comb spacing of 2 GHz with a carrier to noise ratio (CNR) of up to 60 dB. Our technique allows us to separately control the comb spacing, comb bandwidth, CNR and polarization. Our finding can be used for spectroscopy measurement and also for polarization division multiplexing in optical data communications.
我们通过实验研究了垂直腔面发射激光器（VCSEL）在受到频率梳光注入时的非线性极化动力学。通过将注入梳的极化调整为与VCSEL的极化正交，我们展示了单极化或双极化频率梳的产生。然后，利用注入参数（注入功率和失谐频率）来生成初始梳间距的谐波，或者将总输出频率线的数量增加到注入梳线数量的15倍。对于2 GHz的梳间距，优化注入参数可产生覆盖60 GHz的频率梳，其载噪比（CNR）高达60 dB。我们的技术使我们能够分别控制梳间距、梳带宽、CNR和极化。我们的发现可用于光谱测量以及光数据通信中的极化分复用。
