4 Gbit/s Underwater Optical Transmission Using OAM Multiplexing and Directly Modulated Green Laser

Ren, Yongxiong; Li, Long; Zhao, Zhe; Xie, Guodong; Wang, Zhe; Ahmed, Nisar; Yan, Yan; Cao, Yinwen; Willner, A.E.; Liu, Cong; Ashrai, Nima; Ashrafi, Solyman; Tur, Moshe

doi:10.1364/cleo_si.2016.sw1f.4

Cited by 13 publications

(6 citation statements)

References 8 publications

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“…Most of the experimental investigations reported on UOWC have focused on the effect of absorption and multiple scattering on the propagating optical beam [1][2][3][4][5]. In addition, in recent years we have seen experimental investigation of the underwater turbulence and its effects on laser-based UOWC and imaging systems [6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the turbulence effect on underwater optical wireless communications

et al. 2018

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Underwater optical wireless communications (UOWC) performance is affected by turbulence. However, not much research has been carried out to estimate the probability density function (PDF) of the received optical power. In this paper, we investigate the turbulence effect on UOWC using a new experimental setup with a variable link span in a water pool. Different turbulence levels are created by changing the temperature and the rate of an injected water flow in the pool in order to obtain the PDF. Results show that lognormal distribution fits well with the measured PDF up to the scintillation index value of 0.07. In UOWC systems the link span is one of the main factor influencing fluctuations of the received optical power, which has not been investigated. In this work, we obtain the scintillation index and turbulence induced power loss for a range of turbulence strengths and for a transmission link span of up to 12 m. Finally, we show that there is a good agreement between the experimental and simulated results.

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Section: Introductionmentioning

confidence: 99%

Experimental study of the turbulence effect on underwater optical wireless communications

et al. 2018

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“…In this paper, we explore OAM multiplexing for high-speed underwater communications, and we demonstrate up to a 40 Gbit/s link by transmitting four multiplexed green OAM beams through 1.2-metre of water 35 . Furthermore, we investigate the impact of various underwater conditions (e.g., scattering/turbidity, current, and thermal gradients) on beam quality and system performance, finding that thermal gradients can produce significant beam-quality degradation (e.g., modal distortion and beam wander).…”

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confidence: 99%

Orbital Angular Momentum-based Space Division Multiplexing for High-capacity Underwater Optical Communications

Ren

Wang

et al. 2016

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188

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To increase system capacity of underwater optical communications, we employ the spatial domain to simultaneously transmit multiple orthogonal spatial beams, each carrying an independent data channel. In this paper, we show up to a 40-Gbit/s link by multiplexing and transmitting four green orbital angular momentum (OAM) beams through a single aperture. Moreover, we investigate the degrading effects of scattering/turbidity, water current, and thermal gradient-induced turbulence, and we find that thermal gradients cause the most distortions and turbidity causes the most loss. We show systems results using two different data generation techniques, one at 1064 nm for 10-Gbit/s/beam and one at 520 nm for 1-Gbit/s/beam; we use both techniques since present data-modulation technologies are faster for infrared (IR) than for green. For the 40-Gbit/s link, data is modulated in the IR, and OAM imprinting is performed in the green using a specially-designed metasurface phase mask. For the 4-Gbit/s link, a green laser diode is directly modulated. Finally, we show that inter-channel crosstalk induced by thermal gradients can be mitigated using multi-channel equalisation processing.

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“…13,14 To assess the feasibility of such OAM multiplexing in an underwater communications channel it is important to analyse the degree of observed channel degradation induced by flowing water in real Oceanic conditions. In this paper we present a study of measured inter-channel crosstalk for a set of OAM modes propagating through 3m of slowly flowing water, similar to that found in Oceanic conditions.…”

Section: 12mentioning

confidence: 99%

Study of Orbital Angular Momentum Mode Crosstalk Induced by Propagation Through Water

Viola

Valyrakis

Kelly

et al. 2016

Conference on Lasers and Electro-Optics

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The implementation of spatial multiplexing has become an area of great interest for free-space communication links, particularly for its use in last-mile links within larger optical networks. Light carrying orbital angular momentum (OAM) has emerged as a potential candidate that could be utilised for multiplexing independent channels. We will present measured inter-channel crosstalk for a set of 11-OAM modes propagating through 3 m of slowly flowing water, similar to that found in oceanic flow conditions.

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4 Gbit/s Underwater Optical Transmission Using OAM Multiplexing and Directly Modulated Green Laser

Cited by 13 publications

References 8 publications

Experimental study of the turbulence effect on underwater optical wireless communications

Experimental study of the turbulence effect on underwater optical wireless communications

Orbital Angular Momentum-based Space Division Multiplexing for High-capacity Underwater Optical Communications

Study of Orbital Angular Momentum Mode Crosstalk Induced by Propagation Through Water

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