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Supercontinuum (SC) has opened up possibilities for numerous applications in optical communications, signal processing, metrology, and spectroscopy. Supercontinuum generation (SCG) in the integrated nonlinear platforms has attracted much interest recently, due to its fundamental advantages in terms of complementary metal oxide semiconductor compatibility, low power consumption, compact size, and cost‐effectiveness...
In this paper, we review high-capacity underwater optical communications using orbital angular momentum (OAM)-based spatial division multiplexing. We discuss methods to generate and detect blue–green optical data-carrying OAM beams as well as various underwater effects, including attenuation, scattering, current, and thermal gradients on OAM beams. Attention is also given to the system performance...
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 experimentally investigate the effect of EDFA-induced pump ASE noise on cavity-soliton Kerr combs for 64-QAM transmission. We find that all comb optical carrier-to-noise ratios (OCNRs) are similar with a fixed pump OCNR and comb linewidths almost remain unchanged.
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.
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.
We characterize a low-phase-noise Kerr frequency comb for carrying data channels. Results show pump wavelength detuning region grows slightly at higher pump power and the phase noise stays relatively unchanged over pump wavelength detuning region.
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...
Si3N4 horizontal slot waveguide with SiO2 cladding is designed to achieve flat negative dispersion (<−600 ps/(nm·km)) over octave-spanning bandwidth from 782 to 2100 nm. Its maximal propagation loss for wavelength up to 2100nm is <0.18dB/cm.
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 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.
A multiple-layer-overlay (MLO) modulation format is employed for a 14-km optical fiber link and an enhanced spectral efficiency of 2.36 bits/s/Hz is achieved by multiplexing 3-layer signals with each layer carrying a 2-Gbit/s QPSK signal.
We report a transmission of 3 Gbit/s signal over a 4-km grade-index multimode fiber within a bandwidth of 2.54 GHz using multiple-layer-overlay (MLO) modulation format, achieving a spectral efficiency of 1.18 symbols/s/Hz.
The dispersive wave generated from the higher-order dispersion perturbation is found to limit the Kerr comb performance in microring resonators. A negative fourth-order dispersion can potentially reduce the effect of dispersive wave.
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.
This paper reports on an experimental measurement and analysis of multipath-induced intra- and interchannel crosstalk effects in a mm-wave communications link using orbital angular momentum multiplexing at 28 GHz. The reflection is from an ideal reflector parallel to the propagation path. The intra-channel crosstalk effect is measured when a single OAM beam is transmitted, and inter-channel crosstalk...
We present the design and performance characterization of a thin metamaterial plate for generation of orbital angular momentum (OAM) modes of a millimeter-wave beam, which can carry independent data streams over the same physical medium. The plate has a thickness of 1.56 mm, and consists of 3.06 × 0.68 mm rectangular apertures with spatial variant orientations. It generates OAM beams l = +1 and l...
This paper reports an experimental demonstration of modal multiplexing using orbital angular momenta (OAM) in the millimeter-wave regime (28 GHz). Using 1 GBaud/s signals with 16-QAM modulation, a data rate of 32 Gbit/s is obtained by employing 4 different OAM modes (l= −3,−1,+1 and +3) on two orthogonal linear polarization states. Without any digital post-processing, the receiver can separate the...
We describe a method for bi-directional conversion between fundamental Gaussian beams and spatially polarized beams using a spatial light modulator with angular sliced phase pattern.
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