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We demonstrate dual-comb generation by XPM between TE polarized continuous wave and TM polarized soliton pulse. A TE polarized light with only 0.9 mW power could excite a comb with the assistance of a soliton.
We explore using a switchable detector array to reduce the deadtime effect in an OAM-encoded quantum system. For a 4-OAM-state system, the switchable 16-detector array could provide >15X incident photon rate improvement, as compared to a non-switchable 4-detector array.
We experimentally demonstrate an OAM-based quantum communication link populated by a classical channel. OAM enables an up to 100-Mbit/s quantum data rate as well as an additional 18.5-dB separation between the quantum and classical channels.
We demonstrate the use of orbital angular momentum based spatial spectrum analysis for the estimation of object parameters. The proposed approach is insensitive to object rotation or probing beam diffraction caused by object truncation.
We experimentally demonstrate beam displacement tracking and correction using orbital-angular-momentum (OAM) beams based position detection over a 400-Gbit/s OAM-multiplexed link. Power penalties <3 dB are achieved with the displacement up to ±10 mm.
We experimentally demonstrate the use of orbital angular momentum (OAM) superposition as basis for the generation of a directed energy beam. Different OAM superpositions are tested with a maximum achieved peak power gain of ∼2.5.
We experimentally demonstrate 7-fold multicasting of 20-Gbaud QPSK signals based on Kerr frequency combs generated in a silicon nitride microresonator. The effect of high phase-noise comb state on the multicasting performance has also been studied.
We demonstrate 4-Gbit/s underwater transmission of multiplexed four green OAM beams using directly-modulated 520-nm laser diode. The influence of various channel conditions, including scattering, water currents and temperature gradient (water turbulence) on system performance is investigated.
We report a transmission of 2 Gb/s signal over a two-channels, 1.2 meter OAM-multiplexed optical underwater link through water thermal inhomogeneity using 2×2 CMA equalization to mitigate crosstalk and system performance degradation.
We demonstrate high-efficient polarization insensitive OAM generation using integrated phase masks and measure their tolerance to the misalignment of incident beams. An 80 Gbit/s communication link of two OAM channels by using phase masks is demonstrated.
The generation of primary sub-comb-lines with high coherence using dual pumps in a SiN microresonator is investigated. A total capacity of 400 Gbit/s has been experimentally demonstrated in coherent communications based on the generated combs.
This paper reports an experimental investigation of using orthogonal frequency division multiplexing (OFDM) on orbital-angular momentum (OAM) channels when there is intersymbol interference (ISI) caused by multipath effects. The impulse response measurement indicates that due to the divergence of OAM beams, channels of larger OAM number are more affected by the ISI caused the reflections from surrounding...
We experimentally demonstrate and investigate the performance of a multi-input-multiple-output (MIMO) free-space optical link employing orbital-angular-momentum multiplexing through turbulent channel. We show that turbulence effects can be mitigated by exploiting spatial diversity and MIMO equalization.
We present a short-range experimental orbital-angular-momentum (OAM) multiplexing millimeter-wave communication system using patch antenna arrays. The dependence of the evolution of OAM beams on the number of array elements and array radius are analyzed. We also find phase delay deviation of 30 degrees leads to mode purity degrading to ∼1% and power deviation of 6 dB reduces the purity by <40%...
In this paper, the generation and steering of beams carrying orbital angular momentum utilizing a custom-designed circular antenna array has been demonstrated at 28 GHz. A steering angle as large as 30 degrees for an orbital angular momentum (OAM) beam has been achieved. The effect of number of antennas and the distance from antennas to the array center to the quality of beam generation and beam steering...
This paper reports an experimental demonstration of a 32-Gbit/s wireless link using orbital angular momentum (OAM) and polarization multiplexing in a millimeter-wave regime at 60 GHz. Results of the analysis show that a higher carrier frequency reduces the propagation loss as well as the size of the transmitter and receiver, particularly for OAM channels with higher OAM values. Further, two different...
We study the impact of the breather soliton in the Kerr comb generation on the communication systems. The breather soliton is found to generate multiple sub-teeth which may bring the distortion to the transmitted signals.
We demonstrate a new freedom to handle orbital-angular-momentum order. Using coordinate transformation we realize the bidirectional transformation between orders 2l (l=+5 to −5) and orders l. Mode purity and 2 OAM multiplexing system characteristics after division and multiplication are shown.
We investigate a pointing and tracking approach for an OAM multiplexing free-space communication link based on the measurement of the intensity gradient of the received beam. The OAM intensity gradient-based approach may potentially improve the system's tracking accuracy.
We report a transmission of 400 Gbit/s signal over a four channels, 1-meter mode-division-multiplexed free space optical communication link using multiple orbital-angular-momentum beams with non-zero radial indices, achieving a power penalty less than 6 dB.
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