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A modified sequential addition method is proposed for simulating the deposition of the metal powder layers used in selective laser sintering (SLS) process. The scattering characteristics of the deposited layers are analyzed by means of Monte Carlo ray-tracing simulations and a gray-level co-occurrence matrix (GLCM) method. The validity of the proposed modeling approach is demonstrated by comparing...
We design and experimentally demonstrate a free-space distance emulator for propagating OAM beams over long distances in a lab environment. The performance of the system is assessed by measuring spot radius and radius of curvature of propagated beams.
Using beam divergence controlling to mitigate angular error effects in OAM-based FSO links is investigated through simulation and experiment. Results show that controlling beam divergence allows reducing power loss and angular error induced channel crosstalk.
Optical tuning of guided mode resonance (GMR) is demonstrated in an azo-copolymer waveguide grating structure (WGS), comprised of a one-dimensional holographic surface relief grating inscribed on top of an azo-copolymer planar waveguide layer. The resonance wavelength of GMR is blue-shifted by pumping the WGS with a linear polarized laser beam at 514 nm as a result of the photoinduced refractive index...
We compared power spreading of a partially captured orbital-angular-momentum (OAM) beam by using single and double apertures. Double apertures could help reducing crosstalk from OAMl to OAMl+m by ∼10 dB, where l is an integer and m is an odd number.
In this paper, we present a free-space link utilizing orbital angular momentum (OAM) multiplexing, where only a proportion of the beam is received. Partially receiving an OAM mode could lead to crosstalk between neighboring modes. Here, we analyzed the effect of the aperture size on the system crosstalk both numerically and experimentally. We also demonstrated an optical data link with a total capacity...
Multiplexing/demultiplexing of 1008 data channels using orbital angular momentum (OAM) mode-division-multiplexing combined with wavelength-division-multiplexing is demonstrated. 24 OAM modes, each carrying 42 wavelengths, and each wavelength transporting a 100 Gbit/s QPSK signal, are multiplexed, with an aggregated capacity of 100.8 Tbit/s.
We demonstrate muxing, transmission and demuxing of 2 OAM beams over 10 wavelength channels through 1.1-km of vortex fiber. An aggregated total capacity of 1.6-Tbit/s is achieved by using 20-Gbaud/s 16-QAM signal on each channel.
We propose reconfigurable optical add/drop multiplexing in a data link using orbital angular momentum (OAM) mode division multiplexing. Adding/dropping of one OAM mode from three multiplexed OAM modes, each carrying 100 Gbit/s QPSK data is demonstrated, with an OSNR penalty of <; 2dB.
We demonstrate OAM-based reconfigurable optical switching functions among multiple OAM modes. Three-pair OAM modes exchange shows 3.6-dB conversion efficiency and selective data exchange among three 100-Gb/s QPSK OAM channels has a 2.1-dB OSNR penalty.
A tunable orbital angular momentum (OAM) mode filter is proposed. Filtering/blocking selected channels from 4 spatially multiplexed OAM channels is demonstrated. An OSNR penalty of <2 dB is observed when using the filter for 100 Gb/s QPSK data channels.
We present OAM mode distortion monitoring by using an interferometer with π/2 phase-shift to reconstruct the phase profile without any movement of instruments. Monitoring of distortion caused by misalignment and atmospheric turbulence are successfully demonstrated.
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