Zhang Huabin, Fu Chuanwen, Fang Juncheng, Lei Ting, Zhang Yilin, Yuan Xiaocong
Appl Opt. 2020 Dec 10;59(35):11041-11045. doi: 10.1364/AO.409641.
The amount of information is increasing rapidly to reach the capacity limit of single mode fiber. Cylindrical vector beams (CVBs) as the eigenmodes of fiber have been demonstrated to increase the capacity in multiplexing optical communication. As a key component of CVB multiplexing, a sorter based on spin-dependent vortex Dammann grating has advantages of uniform power distribution and compact size. Here, we propose and demonstrate a spin-dependent vortex Dammann grating device that can realize the sorting of multiple CVBs. By a spin-dependent focusing lens, the spin components of the CVBs are selectively focused or derived; therefore, the coaxially incident CVBs are separated effectively. We also experimentally demonstrate the CVB demultiplexing communication enabled by the grating with low channel cross talk satisfying the communication requirement.
信息量正在迅速增加，以达到单模光纤的容量极限。圆柱矢量光束（CVB）作为光纤的本征模，已被证明可提高复用光通信中的容量。作为CVB复用的关键组件，基于自旋相关涡旋达曼光栅的分选器具有功率分布均匀和尺寸紧凑的优点。在此，我们提出并演示了一种自旋相关涡旋达曼光栅装置，它可以实现多个CVB的分选。通过自旋相关聚焦透镜，CVB的自旋分量被选择性地聚焦或导出；因此，同轴入射的CVB被有效分离。我们还通过实验演示了由该光栅实现的CVB解复用通信，其具有低信道串扰，满足通信要求。
