Abstract
Spatial modes have received substantial attention over the last decades and are used in optical communication applications. In fiber-optic communications, the employed linearly polarized modes and phase vortex modes carrying orbital angular momentum can be synthesized by fiber vector eigenmodes. To improve the transmission capacity and miniaturize the communication system, straightforward fiber vector eigenmode multiplexing and generation of fiber-eigenmode-like polarization vortices (vector vortex modes) using photonic integrated devices are of substantial interest. Here, we propose and demonstrate direct fiber vector eigenmode multiplexing transmission seeded by integrated optical vortex emitters. By exploiting vector vortex modes (radially and azimuthally polarized beams) generated from silicon microring resonators etched with angular gratings, we report data-carrying fiber vector eigenmode multiplexing transmission through a 2-km large-core fiber, showing low-level mode crosstalk and favorable link performance. These demonstrations may open up added capacity scaling opportunities by directly accessing multiple vector eigenmodes in the fiber and provide compact solutions to replace bulky diffractive optical elements for generating various optical vector beams.
Highlights
Optical vortices have attracted increasing interest since the early description as the basic properties of ‘dislocations in wave trains’[1]
By exploiting vector vortex modes generated from silicon microring resonators etched with angular gratings, we report data-carrying fiber vector eigenmode multiplexing transmission through a 2-km large-core fiber, showing low-level mode crosstalk and favorable link performance
We propose and demonstrate the multiplexing and kilometer-scale data transmission of two fiber vector eigenmodes (TM01 and TE01) generated via integrated optical vortex emitters
Summary
Optical vortices have attracted increasing interest since the early description as the basic properties of ‘dislocations in wave trains’[1]. Optical vortices have been extensively studied in a variety of fields such as optical manipulation, trapping, tweezers, microscopy, imaging, material processing, astronomy, and quantum processing[3,4,5,6,7,8,9,10,11,12] Beyond these diverse developments, optical vortices, as one type of spatial mode accessing the spatial domain of light waves, have recently been exploited in free-space and fiber optical communications[13,14,15,16,17,18,19,20,21,22,23,24,25,26], either by encoding M-ary information as high-dimensional vortex states for modulation[13,16,17,23,25,26] or by employing optical vortices as information carriers for multiplexing[14,15,18,19,20,21,22,24,25,26].
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