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- W2802058324 abstract "Abstract Orbital angular momentum (OAM) multiplexing has caused a lot of concerns and researches in recent years because of its great spectral efficiency and many OAM systems in free space channel have been demonstrated. However, due to the existence of atmospheric turbulence, the power of OAM beams will diffuse to beams with neighboring topological charges and inter-mode crosstalk will emerge in these systems, resulting in the system nonavailability in severe cases. In this paper, we introduced independent component analysis (ICA), which is known as a popular method of signal separation, to mitigate inter-mode crosstalk effects; furthermore, aiming at the shortcomings of traditional ICA algorithm’s fixed iteration speed, we proposed a joint algorithm, CSO-ICA, to improve the process of solving the separation matrix by taking advantage of fast convergence rate and high convergence precision of chicken swarm algorithm (CSO). We can get the optimal separation matrix by adjusting the step size according to the last iteration in CSO-ICA. Simulation results indicate that the proposed algorithm has a good performance in inter-mode crosstalk mitigation and the optical signal-to-noise ratio (OSNR) requirement of received signals (OAM+2, OAM+4, OAM+6, OAM+8) is reduced about 3.2 dB at bit error ratio (BER) of 3.8 × 10−3. Meanwhile, the convergence speed is much faster than the traditional ICA algorithm by improving about an order of iteration times." @default.
- W2802058324 created "2018-05-17" @default.
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- W2802058324 date "2018-09-01" @default.
- W2802058324 modified "2023-09-24" @default.
- W2802058324 title "Mitigation of crosstalk based on CSO-ICA in free space orbital angular momentum multiplexing systems" @default.
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- W2802058324 doi "https://doi.org/10.1016/j.optcom.2018.04.007" @default.
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