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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.
We experimentally demonstrate a 400-Gbit/s free-space optical communications link over 120 meters on the building roof by multiplexing four orbital angular momentum (OAM) modes (OAM l = ±1, ±3) each carrying a 100-Gbit/s data channel.
We investigate the design parameters for an OAM multiplexing-based free-space optical data link by analyzing power loss, channel crosstalk, and power penalty of the link, considering the misalignment between the transmitter and receiver (displacement, angular error, or their combination). Given a specific link distance, a transmitted beam size design approach is suggested. In addition, we also provide...
We experimentally demonstrate free-space optical transmission using two multiplexed OAM-carrying Bessel beams under obstructed path conditions. An OSNR penalty < 2.5 dB is observed when the obstruction is placed in the beam center.
We experimentally demonstrate space division multiplexing in a basis of vector modes. Vector modes are a modal bases set, which have spatially varying polarization. Our experimental realization operates with link capacity of 160 G-bit/s, modal crosstalk and BER results are presented.
An intensity-based algorithm is employed to derive the correction phase pattern for a distorted probe orbital-angular-momentum (OAM) beam. This correction pattern is used to compensate the distortions of three multiplexed OAM beams, each carrying a 50-Gbaud QPSK signal. The crosstalk between channels is reduced by >5 dB with this approach.
We demonstrate orbital angular momentum modes separation using a geometrical transform-based mode sorter combined with a spatial Fast Fourier Transform. The observed crosstalk between the adjacent modes is <−11.8 dB. A lower crosstalk of <−18.6 dB is anticipated by simulation results.
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.
A mode (de)multiplexer in a basis of OAM modes for MIMO-based and non-MIMO-based multimode fiber systems is experimentally demonstrated which via a single optical element can (de)multiplex and generate individual modes with potential scalability.
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...
We demonstrate a scheme that can arbitrarily manipulate the orbital-angular-momentum (OAM) and the polarization of each data channel in an OAM- and polarization-multiplexed communication system. A manipulation-induced power penalty of < 1dB is observed when 100 Gbit/s Quadrature-phase-shift-keying data is carried on each channel.
The simultaneous compensation of multiple orbital angular momentum (OAM) modes propagating through turbulent channel is experimentally demonstrated by using a Gaussian probe beam for wavefront sensing. The experimental results indicate that the turbulence-induced crosstalk and power penalty could be efficiently mitigated by ∼12.5 dB and ∼11 dB respectively.
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.
Turbulence-induced crosstalk and system penalty for an OAM-multiplexed free space optical communication link is experimentally investigated. The power penalty is found to exceed 10 dB in weak turbulence condition due to severe crosstalk.
Light carries an orbital angular momentum in addition to, and independent, of photon spin. Whereas the spin angular momentum (polarization) has only two orthogonal states, the orbital angular momentum has any number. To use this extra information we present a multi-way beam splitter to efficiently separate individual photons according to their orbital angular momentum.
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