Offset tolerance of an orbital angular momentum optical communication system with angular deflection

Yin, Xiaoli; Sang, Hong-qing; Cui, Xiaozhou; Chang, Huan; Li, Li; Wu, Guohua

doi:10.1016/j.optcom.2017.02.014

Cited by 14 publications

(9 citation statements)

References 16 publications

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“…Since the OAM transmission is mainly through free-space, there are some studies 27,28) reporting the influence of lateral displacement and angular deflection between the transmitting OAM beams and the receiver plane. However, there had been no studies reporting such influence on the mode sorting performances until we presented in Microoptics Conference 2017.…”

Section: )mentioning

confidence: 99%

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Mode sorting performance for optical beams carrying orbital angular momentum suffering lateral displacement and angular deflection

Kishikawa¹,

Sakashita²,

Goto³

2018

Jpn. J. Appl. Phys.

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Beams carrying orbital angular momentum (OAM) is expected to be a new degree of multiplexing to increase transmission capacity in the optical communication. Mode sorting methods have been reported so far as efficient ways to demultiplex such OAM multiplexed lightwaves. Since the OAM transmission is mainly through free-space, the transmitting OAM lightwave may suffer lateral displacement and angular deflection on the receiver plane. In this paper, we numerically investigate the tolerance to lateral displacement and angular deflection on the mode sorting performances for beams carrying OAM. Comparing the performance in terms of crosstalk in between high resolution and ordinary resolution mode sorting methods reveals that the high resolution one shows a slight lower crosstalk while almost the same tolerance as the ordinary resolution one.

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Section: )mentioning

confidence: 99%

“…The angular deflection is defined as the angle γ corresponding to the tilted aperture of the mode sorter with respect to the plane perpendicular to the beam axis. The phase term due to the angular deflection is expressed as 28) Phase ang ðr; Þ ¼ expðik tan Á r sin Þ: ð3Þ…”

Section: Lateral Displacement and Angular Deflectionmentioning

confidence: 99%

Mode sorting performance for optical beams carrying orbital angular momentum suffering lateral displacement and angular deflection

Kishikawa¹,

Sakashita²,

Goto³

2018

Jpn. J. Appl. Phys.

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“…There is also a new type of circular photonic crystal fibers method to control the generation and transmission of OAM mode and to receive and detect. 2,3 Using these methods, the OAM communication system will be affected by atmospheric turbulence, lateral offset, angular tilt, and other factors, and has very high requirements for the alignment of the optical path, 4 and it needs to be corrected by an expensive adaptive optical system at the receiving end.…”

Section: Introductionmentioning

confidence: 99%

Recognition of orbital angular momentum vortex beam based on convolutional neural network

Chen

2021

Micro & Optical Tech Letters

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To identify different modes of orbital angular momentum (OAM) vortex beams after demultiplexing, deep learning technology is introduced, and a convolutional neural network (CNN) model is designed to detect OAM beams. The light intensity distribution maps of the Laguerre Gaussian beam with the topological charge from 1 to 20 through experiments are collected, the random phase screens are generated by using the power spectrum inversion method, to simulate the transmission of Laguerre Gaussian beams in the different atmospheric turbulence channels. The recognition accuracy is studied by the conditions of different CNN model iteration times, beam wavelengths, and data sets. The images are classified and processed to make different data sets, and the random vortex beam training sets are tested. Experimental results show that this method with about 98% accuracy for the conditions of long-wavelength beams and medium or weak turbulence. The training on complex training sets can improve the effect.

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“…In recent years, the study of optical vortex beams carrying orbital angular momentum (OAM) has been a popular topic in the free space optical (FSO) communication field [1]. OAM beams have a particular helical phase term of exp(ilφ), where the OAM mode l, an infinite integer value, is the number of 2π phase shifts across the beam and φ is the azimuthal angle [2]. Beams with distinct OAM states are orthogonal to each other, which considerably improves the capacity of communication systems by OAM encoding or OAM multiplexing [3].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Atmospheric Turbulence Detection Using an Orbital Angular Momentum Beam Via a Convolutional Neural Network

et al. 2019

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Atmospheric turbulence (AT) tends to impair the performance of free space optical (FSO) communication systems. Detecting AT strength is significant for turbulence effect mitigation, which can appropriately guide the selection of turbulence mitigation techniques and modulation formats. Orbital angular momentum (OAM) beam aberrations received through the turbulence channel are closely related to the turbulence strength. In this paper, we experimentally detect the AT strength using an OAM beam based on a convolutional neural network (CNN). We collect 8 kinds of superposed OAM beam intensity images after 5 levels of turbulence in the laboratory as datasets and test the AT detector performance with respect to the number of pixels, mode number of OAM beams, different AT sets and training set size. The results show that the AT detection accuracy is near 100% for 3 kinds of ATs, and the accuracy remains at approximately 85% for 5 kinds of ATs. In addition, using data augmentation methods or a hybrid dataset can improve the AT detection accuracy. The CNN-based method in this paper can help detect the AT strength in atmospheric channels and provide references for choosing appropriate techniques to mitigate turbulence effects and then enhance the OAM-FSO system performance.

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Offset tolerance of an orbital angular momentum optical communication system with angular deflection

Cited by 14 publications

References 16 publications

Mode sorting performance for optical beams carrying orbital angular momentum suffering lateral displacement and angular deflection

Mode sorting performance for optical beams carrying orbital angular momentum suffering lateral displacement and angular deflection

Recognition of orbital angular momentum vortex beam based on convolutional neural network

Experimental Study of Atmospheric Turbulence Detection Using an Orbital Angular Momentum Beam Via a Convolutional Neural Network

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