Controlling slow and fast light and dynamic pulse-splitting with tunable optical gain in a whispering-gallery-mode microcavity
Controlling slow and fast light and dynamic pulse-splitting with tunable optical gain in a whispering-gallery-mode microcavity
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DOI：
10.1063/1.4948922
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发表时间：
2016-05
影响因子：
4
通讯作者：
M. Asano;C. Ozdemir;Weijian Chen;R. Ikuta;Lan Yang;N. Imoto;Takashi Yamamoto
中科院分区：
文献类型：
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作者：
M. Asano;C. Ozdemir;Weijian Chen;R. Ikuta;Lan Yang;N. Imoto;Takashi Yamamoto
我们报道了由掺Er3+的二氧化硅制成的回音廊模式微环形谐振腔中对慢光和快光的可控操纵。在保持微腔与光纤空间距离不变的情况下，通过增大泵浦功率，观察到了光纤锥形波导与微谐振腔之间的耦合从欠耦合到临界耦合再到过耦合的连续转变。这进而实现了从快光到慢光的切换，反之亦然，只需增加光学增益。在慢光区观察到比被动硅谐振腔(没有光学增益)的延迟提高一倍。此外，我们还展示了在慢光/快光系统中利用光增益的动态脉冲分裂及其控制。
We report controllable manipulation of slow and fast light in a whispering-gallery-mode microtoroid resonator fabricated from Erbium (Er3+) doped silica. We observe continuous transition of the coupling between the fiber-taper waveguide and the microresonator from undercoupling to critical coupling and then to overcoupling regimes by increasing the pump power even though the spatial distance between the resonator and the waveguide was kept fixed. This, in turn, enables switching from fast to slow light and vice versa just by increasing the optical gain. An enhancement of delay of two-fold over the passive silica resonator (no optical gain) was observed in the slow light regime. Moreover, we show dynamic pulse splitting and its control in slow/fast light systems using optical gain.