纤维环的Angular Momentum超连续谱
Angular Momentum Supercontinuum from Fibre Rings
摘要：
宽带相干光携带的光学角动量在各种经典和量子通信应用中具有潜在的效用，但目前很少存在这样的光源。研究了耦合光纤环形阵列中超连续谱的产生。携带离散角动量的短脉冲经历孤子裂变，自发地破坏方位对称性。这导致具有宽带频谱以及非平凡角动量分布的脉冲的训练。这些时空孤立波，局部化在一个单一的纤维芯，发出一种不寻常的形式的共振辐射，可以存在，即使在没有内在的高阶色散，由环阵列的晶格色散引起的。我们探讨了光纤芯之间的耦合特性如何影响所产生的超连续谱，特别是如何温和地扭转阵列可以有效地操纵其角动量含量和共振频率通过诱导Peierls相位。
英文摘要：
Broadband, coherent light carrying optical angular momentum is of potential utility for a variety of classical and quantum communication applications, but at present few such sources exist. We study the generation of supercontinua in a ring array of coupled optical fibres. Short pulses carrying discrete angular momentum undergo soliton fission, spontaneously breaking azimuthal symmetry. This results in a train of pulses with a broadband frequency spectrum as well as a non-trivial angular momentum distribution. These spatio-temporal solitary waves, localised around a single fibre core, emit an unusual form of resonant radiation which can be present even in the absence of intrinsic higher order dispersion, being induced by the lattice dispersion of the ring array. We explore how the coupling properties between fibre cores affect the resulting supercontinuum, in particular how mildly twisting the array can effectively manipulate its angular momentum content and resonant frequencies through the induced Peierls phase.
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