Cylindrical vector beams demultiplexing optical communication based on spin-dependent vortex Dammann grating

Abstract

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.

Nanostructure-based orbital angular momentum encryption and multiplexing

“…Traditional optical communication systems use demultiplexers such as spatial light modulators, 92,93 diffractive optical elements, or Dammann gratings. 94 These detectors require bulky components, preventing direct integration onto chips and hindering the application of OAM in integrated photonics.…”

Miniaturized optical vortex mode demultiplexer: Principle, fabrication, and applications

“…分选 [77−79] . 2015年, Lei等 [22] 图 5 (a) 光子的SAM变化转换为OAM的装置示意图 [76] ; (b) 基于达曼光栅进行OAM(解)复用的自由空间光通信示意图 [22] ; (c) 使用双光子光刻技术在少模光纤表面上制造涡旋光栅示意图 [80] ; (d)基于电子束刻蚀法制作的超表面流程图 [81] Fig. 5.…”

“…5. (a) The schematic of SAM-OAM mode converter [76] ; (b) the schematic of free-space optical communication based on Dammann grating for OAM (de)multiplexing [22] ; (c) the details of fabricating vortex gratings on the surface of few-mode optical fibers using two-photon lithography [80] ; (d) flow chart of producing metasurface based on electron beam etching [81] .…”

Multi-value phase grating fabrication using direct laser writing for generating a two-dimensional focal spot array

“…Diffractive optical element (DOE) is a device made by transparent materials with complex morphology, which can achieve many different optical functions by designing corresponding surface profiles through the diffractive optical theory [1][2][3][4]. One application of DOE is a beam splitter, which is widely used in parallel micro-processing, creating 3D spot arrays, optical vortex, multiple imaging, and communication multiplexing [5][6][7][8][9][10][11][12][13]. Through different surface designs, the beam splitter can either generate multiple spots at different focal depths or a spot array on the same focal plane from a single 3 Authors contributed equally to this work.…”