Advanced Modulation Schemes for Short-Range Optical Communications

Randel, S.; Breyer, F.; Lee, Sian C J; Walewski, Joachim W.

doi:10.1109/jstqe.2010.2040808

Cited by 151 publications

(76 citation statements)

References 37 publications

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“…Among PAM schemes, 4-PAM with DFE offered the best performance closely followed by 2-PAM. These results follow the theoretical predictions in [25] and experimental results in [26]. It is theoretical shown in [26] that 4-PAM with DFE requires less optical power than 2-PAM with DFE when data rate is beyond 5-times the electrical bandwidth.…”

Section: M-pam Measurementssupporting

confidence: 88%

Visible light communication using InGaN optical sources with AlInGaP nanomembrane down-converters

Santos¹,

Rajbhandari²,

Tsonev³

et al. 2016

Opt. Express

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Abstract:We report free space visible light communication using InGaN sources, namely micro-LEDs and a laser diode, down-converted by a redemitting AlInGaP multi-quantum-well nanomembrane. In the case of micro-LEDs, the AlInGaP nanomembrane is capillary-bonded between the sapphire window of a micro-LED array and a hemispherical sapphire lens to provide an integrated optical source. The sapphire lens improves the extraction efficiency of the color-converted light. For the case of the downconverted laser diode, one side of the nanomembrane is bonded to a sapphire lens and the other side optionally onto a dielectric mirror; this nanomembrane-lens structure is remotely excited by the laser diode. Data transmission up to 870 Mb/s using pulse amplitude modulation (PAM) with fractionally spaced decision feedback equalizer is demonstrated for the micro-LED-integrated nanomembrane. A data rate of 1.2 Gb/s is achieved using orthogonal frequency division multiplexing (ODFM) with the laser diode pumped sample.

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Section: M-pam Measurementssupporting

confidence: 88%

Visible light communication using InGaN optical sources with AlInGaP nanomembrane down-converters

Santos¹,

Rajbhandari²,

Tsonev³

et al. 2016

Opt. Express

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“…The VLC can only be perceived as an IM/DD system, which means that the modulation signal has to be both pure valued and unipolar. The application of [10] the well-researched and developed modulation schemes from the field of RF communications. This technique like as on-off keying (OOK), pulse-position modulation (PPM), pulse-width modulation (PWM) and unipolar M-ary pulse amplitude modulation (M-PAM) can be applied in a relatively uncomplicated fashion, a more resilient technique such as OFDM is required.…”

Section: The Modulation and Li•fi Systemmentioning

confidence: 99%

The Next Generation of Wireless Communication Using Li-Fi (Light Fidelity) Technology

Perwej¹

2017

JCN

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Today scenario almost all the peoples are using internet to fulfill their task through a wired or wireless network. The speed of internet is an important issue and everyone be it business, organizations, entrepreneurs, and institutions is thrust for getting correct information at the correct time and correct place. Then need rapid internet connectivity, technology and huge spectrum of channels. The wireless-fidelity (Wi-Fi) gives you the speed of 150 Mbps, according to standards of 1EEE 802.11n, but not sufficient to fulfill the necessity of required users over the network. In order to remove this deficiency of Wi-Fi, a new technology is developed by German physicist, professor Harald Haas is known as Li-Fi. The Li-Fi is a wireless communication system in which light is used as a carrier signal instead of traditional radio frequency as in Wi-Fi. Li-Fi is a technology that utilizes a light emitting diode to transmit data wirelessly. It uses a bidirectional and the wireless mode of communication using light. In this paper, I am aiming to demonstrate a close-up view about Li-Fi Technology. This technology we can obtain the data rate greatly speedier than 10 Mbps, which is a lot greater than our LAN (Local Area Network). Li-Fi is very remunerative over Wi-Fi as it uses VLC by which we can make use of the maximum 60 GHz spectrum. Li-Fi confer transmission of data via LED bulb whose intensity change in an excessively faster speed that it could not be able to be explored by the human eye. Li-Fi is confined to the illuminated area, endue a tremendously controllable environment. The signals cannot travel via walls and are fully secure essentially disassemble the threat of data being hacked remotely.

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“…Additionally, in the POF networking, the discrete multi-tone (DMT) modulation [6][7][8] with a bit-loading algorithm has been an efficient solution to maximize the system capacity [9]. However, the DMT signal is extremely sensitive to the nonlinear behavior of the SI-POF systems [10], and the low-cost resonant cavity light emitting diode (RCLED) is the main device that causes the nonlinearity due to the following two reasons [11]:…”

Section: Introductionmentioning

confidence: 99%

RCLED Optimization and Nonlinearity Compensation in a Polymer Optical Fiber DMT System

Miao

Chen

et al. 2016

Applied Sciences

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Abstract:In polymer optical fiber (POF) systems, the nonlinear transfer function of the resonant cavity light emitting diode (RCLED) drastically degrades the communication performance. After investigating the characteristics of the RCLED nonlinear behavior, an improved digital look-up-table (LUT) pre-distorter, based on an adaptive iterative algorithm, is proposed. Additionally, the system parameters, including the bias current, the average electrical power, the LUT size and the step factor are also jointly optimized to achieve a trade-off between the system linearity, reliability and the computational complexity. With the proposed methodology, both the operating point and efficiency of RCLED are enhanced. Moreover, in the practical 50 m POF communication system with the discrete multi-tone (DMT) modulation, the bit error rate performance is improved by over 12 dB when RCLED is operating in the nonlinear region. Therefore, the proposed pre-distorter can both resist the nonlinearity and improve the operating point of RCLED.

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Advanced Modulation Schemes for Short-Range Optical Communications

Cited by 151 publications

References 37 publications

Visible light communication using InGaN optical sources with AlInGaP nanomembrane down-converters

Visible light communication using InGaN optical sources with AlInGaP nanomembrane down-converters

The Next Generation of Wireless Communication Using Li-Fi (Light Fidelity) Technology

RCLED Optimization and Nonlinearity Compensation in a Polymer Optical Fiber DMT System

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