752-MHz Modulation Bandwidth of High-Speed Blue Micro Light-Emitting Diodes

Lan, Hao-Yu; Tseng, I-Chen; Kao, Hsuan-Yun; Lin, Yung-Hsiang; Lin, Gong‐Ru; Wu, Chao-Hsin

doi:10.1109/jqe.2018.2867087

Cited by 41 publications

(17 citation statements)

References 23 publications

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“…[ 35 ] In the fiber laser, the combined effect of the dispersion and nonlinear effect can be compensated by the gain bandwidth limitation of the gain medium itself directly, so that the spectrum is displayed as an approximate rectangular profile. [ 36–38 ] There is also a square wave pulse (SWP) in the negative dispersion region, and its pulse energy increases with the increase of the pump energy, so as to obtain a high‐energy pulsed laser output, while the peak power is mainly fixed. [ 39 ] Compared with SA prepared by traditional industrial methods, such as SESAM, which has a relatively high production cost, a complicated process and a narrow bandwidth when used for saturable absorption and it is only used in the near‐infrared band.…”

Section: Introductionmentioning

confidence: 99%

MOF‐Derived Porous Dodecahedron rGO‐Co₃O₄ for Robust Pulse Generation

Han

et al. 2022

Adv Materials Inter

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As a member of the porous crystalline material family, metal organic framework (MOF) materials have been widely used in the fields of photodetection, photovoltaic cells, nonlinear optical devices, supercapacitors, and biological imaging. However, few reports about robust pulsed laser based on MOF‐derived nanomaterials especially the one with unique structure have been reported till now. In this paper, porous dodecahedron rGO‐Co3O4 is synthesized by calcining the MOF template and systematically analyzed. Interestingly, the rGO‐Co3O4 is successfully prepared as a saturable absorber (SA) by using the optical deposition method and the modulation depth of the rGO‐Co3O4 SA is 8.38%. Through different dispersion management, robust pulses with 1.5 µm dissipative soliton (DS) in the frequency domain and square wave pulse (SWP) in the time domain can be obtained in the erbium‐doped fiber laser based on rGO‐Co3O4 SA. The 3‐dB bandwidth and pulse duration of the DS are 6.81 nm and 62.01 ps, respectively. The pulse tuning range of the SWP is 1.24 ns ≈ 19.14 ns. It is worth mentioning that the threshold of the SWP is 53.72 mW, and the mode‐locked laser can be self‐started at the pump power of 72.04 mW. The experimental results show that the porous dodecahedral rGO‐Co3O4 material derived from MOF can be used as an excellent nonlinear optical modulator, providing a new choice for material processing.

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Section: Introductionmentioning

confidence: 99%

MOF‐Derived Porous Dodecahedron rGO‐Co₃O₄ for Robust Pulse Generation

Han

et al. 2022

Adv Materials Inter

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“…VLC links integrating OLEDs as optical transmitters have already been reported by our groups and others [9][10][11][12][13][14] , with data rates exceeding 10 Mb/s due to the leveraging of both equalisation algorithms and wavelength division multiplexing. Undoubtedly, such data rates are not as high as those afforded by "inorganic" VLC systems (up to 35 Gb/s) 20 based on multiple-quantum-well (MQW) LEDs and LDs, which are mainly limited by the intrinsic exciton decay lifetime [21][22][23][24] . This lifetime can be decreased to the sub-nanosecond range by engineering the MQW active layer volume, improving heat sinking, heavy doping, or using non-polar substrates [21][22][23][24] .…”

Section: Introductionmentioning

confidence: 99%

“…Undoubtedly, such data rates are not as high as those afforded by "inorganic" VLC systems (up to 35 Gb/s) 20 based on multiple-quantum-well (MQW) LEDs and LDs, which are mainly limited by the intrinsic exciton decay lifetime [21][22][23][24] . This lifetime can be decreased to the sub-nanosecond range by engineering the MQW active layer volume, improving heat sinking, heavy doping, or using non-polar substrates [21][22][23][24] . As discussed in previous reports [9][10][11][12][13][14] , OLEDs' lower modulation bandwidths arise from their RC time constant, which strongly depends on charge mobilities of~10 −6 -10 −2 cm 2 /V s in OSs (at least three orders of magnitude lower than that in GaN) and the size of the photoactive area 13 .…”

Section: Introductionmentioning

confidence: 99%

Visible light communication with efficient far-red/near-infrared polymer light-emitting diodes

et al. 2020

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Visible light communication (VLC) is a wireless technology that relies on optical intensity modulation and is potentially a game changer for internet-of-things (IoT) connectivity. However, VLC is hindered by the low penetration depth of visible light in non-transparent media. One solution is to extend operation into the "nearly (in)visible" near-infrared (NIR, 700-1000 nm) region, thus also enabling VLC in photonic bio-applications, considering the biological tissue NIR semitransparency, while conveniently retaining vestigial red emission to help check the link operativity by simple eye inspection. Here, we report new far-red/NIR organic light-emitting diodes (OLEDs) with a 650-800 nm emission range and external quantum efficiencies among the highest reported in this spectral range (>2.7%, with maximum radiance and luminance of 3.5 mW/cm 2 and 260 cd/m 2 , respectively). With these OLEDs, we then demonstrate a "real-time" VLC setup achieving a data rate of 2.2 Mb/s, which satisfies the requirements for IoT and biosensing applications. These are the highest rates ever reported for an online unequalised VLC link based on solution-processed OLEDs.

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“…This is attributed to more carriers being stored in the QW, resulting in a higher recombination rate and lower recombination lifetime. [ 7 ] Guoyi Zhang from Peking University demonstrated the LEDs with superlattice‐like strain relief layer (SRL), which can mitigate the nonlinearity of P–I and improve the signal‐to‐noise ratio (SNR). [ 8 ] By using an external strain that nullifies the internal strain, Zhong Lin Wang group from Beijing Institute of Nanoenergy and Nanosystems reported that at a compressive strain of 0.14%, the highest speed of blue LED increased from 54 to 117 MHz.…”

Section: Approaches For Improving Led Modulation Bandwidthmentioning

confidence: 99%

Improving the Modulation Bandwidth of GaN‐Based Light‐Emitting Diodes for High‐Speed Visible Light Communication: Countermeasures and Challenges

Wan

Wang

Huang

et al. 2021

Advanced Photonics Research

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Visible light communication (VLC) has attracted widespread attention for wireless communications. The popularity of GaN-based light-emitting diodes (LEDs) has also laid a solid foundation for the application of VLC. As the light source of VLC, LED's modulation bandwidth directly determines the speed of communication. Herein, reviewing progress on modulation bandwidth improvement schemes of GaN LEDs transmitter is reviewed, covering aspects from epitaxial to devices. Epitaxial approaches include c-polar facet epitaxial optimization, non/semipolar facet epitaxial growth, and chip scheme such as micro-LEDs, nano-LEDs, resonant cavity-LEDs (RC-LEDs), plasmon, and metacavity LEDs. In terms of white LEDs, approaches to tackle the slow Stokes transfer and long carrier life for conventional phosphors including new color-conversion materials (CCMs) and new energy transfer routes are reviewed. This review promotes the development of GaN-based LEDs as the transmitter for high-speed VLC.

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752-MHz Modulation Bandwidth of High-Speed Blue Micro Light-Emitting Diodes

Cited by 41 publications

References 23 publications

MOF‐Derived Porous Dodecahedron rGO‐Co₃O₄ for Robust Pulse Generation

MOF‐Derived Porous Dodecahedron rGO‐Co₃O₄ for Robust Pulse Generation

Visible light communication with efficient far-red/near-infrared polymer light-emitting diodes

Improving the Modulation Bandwidth of GaN‐Based Light‐Emitting Diodes for High‐Speed Visible Light Communication: Countermeasures and Challenges

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752-MHz Modulation Bandwidth of High-Speed Blue Micro Light-Emitting Diodes

Cited by 41 publications

References 23 publications

MOF‐Derived Porous Dodecahedron rGO‐Co3O4 for Robust Pulse Generation

MOF‐Derived Porous Dodecahedron rGO‐Co3O4 for Robust Pulse Generation

Visible light communication with efficient far-red/near-infrared polymer light-emitting diodes

Improving the Modulation Bandwidth of GaN‐Based Light‐Emitting Diodes for High‐Speed Visible Light Communication: Countermeasures and Challenges

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Product

Resources

About

MOF‐Derived Porous Dodecahedron rGO‐Co₃O₄ for Robust Pulse Generation

MOF‐Derived Porous Dodecahedron rGO‐Co₃O₄ for Robust Pulse Generation