4 OAM x 4 WDM Optical Switching Based on an Innovative Integrated Tunable OAM Multiplexer

Abstract

A 4OAMx4WDM switching experiment has been carried out combining an innovative integrated tunable OAM multiplexer based on 4-concentric omega-shaped silicon waveguides and a refractive element-based OAM demultiplexer; operation is demonstrated up to 120Gb/s.

Demonstration of a Multiplane OAM-Wavelength Packet Switch Controlled by a Two-Step Scheduler Implemented in FPGAs

“…The core element on the transmitting side of each card is the photonic integrated OAM modulator/multiplexer (OAM mod+mux) based on concentric vortex emitters [24], which converts multiple Gaussian beams, i.e., beams propagating in standard fibres, into OAM beams of selectable order and simultaneously multiplexes them. On each card, packets to be delivered to a specific card-port destination are optically modulated on one of the M wavelengths (λ1, …., λM) using M Mach-Zehnder modulators (MZM).…”

“…Demonstration of a multiplane OAM-wavelength packet switch controlled by a two-step scheduler implemented in FPGA A multiplane OAM-wavelength switch exploiting an integrated OAM modulator/multiplexer and a refractive element-based OAM demodulator/demultiplexer was demonstrated in [24]. Nevertheless, in that demonstration only circuit switching was implemented.…”

Mode Division Multiplexing Based on Ring Core Optical Fibers

“…Its underlying principle is that the whispering gallery modes (WGM) supported by a micro-ring resonator can be extracted and converted into radiated OAM modes through the angular grating, with the output topological charge strictly defined according to the azimuthal phase-matching condition leading to high mode purity. Since each micro-ring can only emit one OAM mode, in order to multiplex more OAM modes, two schemes have been proposed and demonstrated [62,63]. One is to vertically integrate multiple concentric micro-ring resonators using wafer bonding technique as shown in Fig.…”

“…7(c) [62] and the other is realized by breaking a complete micro-ring to configure an -shaped waveguide so that multiple concentric devices can be integrated without crossing between the access waveguides, as shown in Fig. 7(d) [63]. However, a common drawback of ring-waveguide devices is that they rely on phasematching condition, and thus are wavelength dependent.…”

The Orbital Angular Momentum of Light for Ultra-High Capacity Data Centers

“…The proposed solutions can be exploited in actual data-center scenario and interfaced with standard data-center equipment, since Gaussian-to-OAM and OAM-to-Gaussian mode conversion is implemented at the OAM link and OAM switch edges, which allows signal processing with standard devices. We proposed an integrated solution for the combined generation and multiplexing of OAM modes based on concentric Omega ()-shaped waveguides [10]. This solution allows the independent tuning of the OAM mode emitted by each waveguide and represents a compact way for Gaussianto-OAM mode conversion and multiplexing.…”