GHz bandwidth GaAs light-emitting diodes

Chen, C. H.; Hargis, M.C.; Woodall, J. M.; Melloch, M. R.; Reynolds, Jeffery S.; Yablonovitch, Eli; Wang, W.

doi:10.1063/1.124092

Cited by 49 publications

(28 citation statements)

References 12 publications

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“…It has been demonstrated that the modulation bandwidth of blue LEDs can be improved by shorting the minority carrier lifetime in active region [49, 50]. Equation (1) shows the relationship between the modulation frequency and the minority carrier lifetimes,

M_{r} (f) = \frac{1}{\sqrt{1 + {(2 π f τ)}^{2}}},

where M r ( f ) is the degree of modulation;

τ^{- 1} = τ_{r}^{- 1} + τ_{nr}^{- 1}

, τ r and τ nr are the radiative and non-radiative lifetimes, respectively.…”

Section: Resultsmentioning

confidence: 99%

Enhanced bandwidth of white light communication using nanomaterial phosphors

et al. 2018

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The bandwidth of white light emitting diodes (WLEDs) is an important factor that affects most of the system performances in visible light communication (VLC). It is mainly limited by the down-conversion phosphors. We propose in this paper to employ nanomaterial phosphors with short fluorescence lifetime and high quantum yield in VLC. The white-emitting device of bandwidth-based lifetime was fabricated by using several kinds of nanophosphors with different fluorescence lifetimes. Moreover, we proposed two theoretical models to analyze the factors that affect bandwidth. Compared with the commercial YAG-based WLEDs, the bandwidth of nanophosphor-based WLEDs can be improved over three times and close to the blue excitation sources. Our study indicates that nanophosphors can become promising fluorescent materials in VLC, and provides a new direction for developing wide-bandwidth VLC systems.

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M_{r} (f) = \frac{1}{\sqrt{1 + {(2 π f τ)}^{2}}},

where M r ( f ) is the degree of modulation;

τ^{- 1} = τ_{r}^{- 1} + τ_{nr}^{- 1}

, τ r and τ nr are the radiative and non-radiative lifetimes, respectively.…”

Section: Resultsmentioning

confidence: 99%

Enhanced bandwidth of white light communication using nanomaterial phosphors

et al. 2018

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“…4,18 The highest reported bandwidths in QW LEDs are saturated near 1 GHz (GaN) and 1.7 GHz (GaAs). 4,6,7,19 …”

Section: Fundamentals Of Modulation For Lasers and Ledsmentioning

confidence: 99%

Semipolar GaN-based laser diodes for Gbit/s white lighting communication: devices to systems

Lee

Shen

Cozzan

et al. 2018

Gallium Nitride Materials and Devices XIII

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We report the high-speed performance of semipolar GaN ridge laser diodes at 410 nm and the dynamic characteristics including differential gain, damping, and the intrinsic maximum bandwidth. To the best of our knowledge, the achieved modulation bandwidth of 6.8 GHz is the highest reported value in the blue-violet spectrum. The calculated differential gain of ~3 x 10 -16 cm 2 , which is a critical factor in high-speed modulation, proved theoretical predictions of higher gain in semipolar GaN laser diodes than the conventional c-plane counterparts. In addition, we demonstrate the first novel white lighting communication system by using our near-ultraviolet (NUV) LDs and pumping red-, green-, and blueemitting phosphors. This system satisfies both purposes of high-speed communication and high-quality white light illumination. A high data rate of 1.5 Gbit/s using on-off keying (OOK) modulation together with a high color rendering index (CRI) of 80 has been measured.

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“…It is also worth noting that the frequency selection is dependent upon the 3 dB bandwidth of an LED. The reported maximum modulation bandwidth of an LED is 1.7 GHz [15]; hence the selected frequencies of f 1 , f 2 and f 3 are justified.…”

Section: Transmittermentioning

confidence: 99%

“…It is found that LEDs can theoretically have a 3 dB bandwidth of up to 2 GHz [13,14]. Additionally, an LED with an optical modulation bandwidth of 1.7 GHz has also been proposed [15].…”

Section: Introductionmentioning

confidence: 99%

2 Gbit/s VLC Scheme Using Time-Frequency Color-Clustered MIMO Based on BCYR LEDs

Han

Sewaiwar

Chung

2016

Journal of the Optical Society of Korea

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A 2 Gbit/s visible-light communication (VLC) scheme using time-frequency color-clustered (TFCC) multiple-input multiple-output (MIMO) based on blue, cyan, yellow, and red (BCYR) light-emitting diodes (LEDs) is presented. In the proposed scheme, BCYR LEDs are employed to form four different color clusters. Data transmission using the four color clusters is performed in MIMO, so that the scheme achieves a very high speed of data transmission. Moreover, the scheme employs the TFCC strategy to yield high performance in terms of bit error rate (BER). TFCC operates in such a way that the original data and the two delayed versions of the data are multiplied by orthogonal frequencies and then transmitted using a specific color of the BCYR LED. In the receiver, color filters are employed to detect the data transmitted from the desired cluster. Selection combining (SC) is also performed to yield a diversity effect within each color cluster, to further improve the performance. Performance evaluation demonstrates that the proposed TFCC MIMO VLC offers a data rate of 2 Gbit/s and a bit error rate of 4×10 , at an Eb/No value of merely 3 dB.

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GHz bandwidth GaAs light-emitting diodes

Cited by 49 publications

References 12 publications

Enhanced bandwidth of white light communication using nanomaterial phosphors

Enhanced bandwidth of white light communication using nanomaterial phosphors

Semipolar GaN-based laser diodes for Gbit/s white lighting communication: devices to systems

2 Gbit/s VLC Scheme Using Time-Frequency Color-Clustered MIMO Based on BCYR LEDs

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