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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.
Maintaining the balance of generation and load is the most important factor in a power system for frequency regulation. Recently, controllable load and renewable energy are integrated increasingly in power grid. In practice, this may have substantial impact on system frequency response (SFR). This paper investigates the effect of load-damping, generator inertia and governor speed characteristics on...
Mining arbitrary shaped clusters in large data sets is an open challenge in data mining. Various approaches to this problem have been proposed with high time complexity. To save computational cost, some algorithms try to shrink a data set size to a smaller amount of representative data examples. However, their user-defined shrinking ratios may significantly affect the clustering performance. In this...
We present a quasi-optical component for the simultaneous de-multiplexing of multiple channels by the transformation of OAM into transverse momentum. A communications link comprising 4 independent channels is demonstrated achieving a data rate of 8 Gbit/s.
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.
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.
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.
How to get more realistic model is important for a virtual arthroscopic knee surgery training system. A method of 3-D reconstruction from the CT images of knee is given. This method selects appropriate threshold for segmentation, according to the histogram of the CT image sequence. Then further processes the images with region growing segmentation. Finally, we get the accurate models. We have reconstructed...
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