Optical vortices are high-capacity data carriers for mode division multiplexing (MDM) in multimode fiber (MMF). This paper reports on the MDM of a combination of helical-phased optical vortices comprising donut modes and Hermite–Gaussian (HG) modes for different radial offsets from the MMF axis. A data rate of 44 Gbps is achieved for wavelength division multiplexing–MDM of two pairs of helical-phased donut mode and HG mode at wavelengths 1550.12 and 1551.72 nm for a MMF length of 1500 m.
Proc. SPIE. 9524, International Conference on Optical and Photonic Engineering (icOPEN 2015)
KEYWORDS: Multimode fibers, Photodetectors, Data modeling, Modulation, Multiplexing, Modulators, Digital micromirror devices, Vertical cavity surface emitting lasers, Local area networks, Data communications
Mode division multiplexing (MDM) is a promising technology for alleviating network traffic congestion in order to future proof current local area network infrastructure. In view of the capacity limits of multimode fiber in the advent of tremendous data growth, various dimensions for multiplexing and modulating data have been commercially deployed in the intensity, phase, wavelength and time domains. The eigenmode dimension, however, has been relatively untapped. This paper models the MDM of spiral-phased donut modes of different diameters in MMF for increasing the data capacity. A data rate of 40Gbit/s up for a distance of 1500 meters is achieved. Analyses of the power coupling coefficients and modal delays at the photodetectors are analyzed for different mode vortex orders.