Optical Filter-Less WDM for Visible Light Communications Using Defocused MIMO

Burton, Andrew; Chvojka, Petr; Haigh, Paul Anthony; Ghassemlooy, Zabih; Zvánovec, Stanislav

doi:10.3390/electronics10091065

Cited by 9 publications

(4 citation statements)

References 18 publications

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“…However, the requirement of multiple narrow-band Txs and Rxs with narrowband optical bandpass filters leads to higher costs and complexity, hindering widespread adoption. To overcome this challenge, low-cost solutions such as filterless WDM were explored for WDM-VLC systems [16][17][18]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

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Electro‐optical spiking neural networks using an enhanced optical axon with pulse amplitude modulation and automatic gain controller

Uleru,

Hulea,

Younus

et al. 2023

IET Optoelectronics

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Visible light communication can be leveraged to establish a wireless link between neurons in spiking networks even when neural areas are in relative motions. In electro‐optical spiking neural networks (SNN), parallel transmission is often achieved through wavelength division multiplexing (WDM). However, WDM can be prohibitive in certain applications due to the need for multiple narrow‐band transmitters and receivers with optical bandpass filters. Instead of WDM, an alternative approach of using non‐orthogonal multiple access is explored (NOMA) with a pulse amplitude modulation (PAM) scheme in optical axons to enable parallel neural paths in an SNN. To evaluate NOMA with PAM, the authors implement an electro‐optical SNN that controls the force of two anthropomorphic fingers actuated by the shape memory alloy‐based actuators. An optical reference channel is used to dynamically adjust the optical receiver's gain to improve the receiver's decoding performance. Experimental results demonstrate that the electro‐optical SNN can maintain control over the fingers and hold an object under varying channel conditions. Hence, the proposed system offers robustness against dynamic optical channels induced by the relative motion of neurons.

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Section: Introductionmentioning

confidence: 99%

“…At the Rx, the aggregated signal is decoded by leveraging the varying responsivity of the photodiode to different wavelengths. The combination of responsivity and LED characteristics is utilised to realise a WDM-MIMO (multiple-input-multiple-output) system for achieving parallel data transmission [17].…”

Section: Introductionmentioning

confidence: 99%

Electro‐optical spiking neural networks using an enhanced optical axon with pulse amplitude modulation and automatic gain controller

Uleru,

Hulea,

Younus

et al. 2023

IET Optoelectronics

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, the wide LED emission spectra presents difficulty in removing the interference noise introduced by other channels using optical-only filters. Signal separation can be achieved using multi-input multi-output (MIMO) technology, which integrates the LED frequency characteristics and PDs [10]- [12]. We previously demonstrated that signal sep-aration can be achieved using optical filters and MIMO technology, even when the emission wavelengths of the LEDs are close together [13].…”

Section: Introductionmentioning

confidence: 99%

MIMO Systems with Neural Networks in OFDM-Based WDM Visible Light Communications

Umezawa

Oshiba

2023

IEICE Trans. Electron.

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In this paper, we describe a wavelength-division multiplexing visible-light communication (VLC) system using two colored light-emitting diodes (LEDs) with similar emission wavelengths. A multiinput multi-output signal-separation method using a neural network is proposed to cancel the optical cross chatter caused by the spectral overlap of LEDs. The experimental results demonstrate that signal separation using neural networks can be achieved in wavelength-multiplexed VLC systems with a bit error rate of less than 3.8 × 10 −3 (forward error correction limit). Furthermore, the simulation results reveal that the carrier-to-noise ratio (CNR) is improved by 2 dB for the successive interference canceller (SIC) compared to the zero-forcing method.

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“…For high-speed communication, the multiple-input multiple-output (MIMO) technique can be applied to the VLC system. However, the realization of the MIMO VLC system is quite challenging due to highly correlated channel conditions [3][4][5]. Similar to VLC, Li-Fi uses LED/LD for its transmitter and PD/IS for its receiver.…”

Section: Introductionmentioning

confidence: 99%

Experimental Demonstration of 3 × 3 MIMO LED-to-LED Communication Using RGB Colors

Jung

Kim

2021

Sensors

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Optical wireless communication (OWC) is one of the promising candidates for beyond fifth-generation communication (B5G). Depending on the type of transmitters, receivers, and information carriers applied in the system, OWC can be categorized into visible light communication, light fidelity, free-space optical communication, optical camera communication, etc. In addition to these OWC subcategories, this paper proposes light-emitting diode (LED)-to-LED communication as another subcategory of OWC technique. Furthermore, we show an experimental demonstration of the multiple-input multiple-output (MIMO) LED-to-LED communication system using red, green, and blue colored LEDs. We believe that LED-to-LED communication is an effective solution to resolve the communication burden arising from massive connectivity in B5G internet of things. Along with the measurement results of the transmitter LED, receiver LED, and the channel properties, it is shown that the MIMO LED-to-LED system is able to successfully recover the transmitted signal with low inter-channel interferences due to the receiver LED’s unique characteristics. Finally, the bit error rate (BER) performance of the MIMO LED-to-LED system is shown in comparison with the BER performance of the single-input single-output (SISO) LED-to-LED system. We successfully implemented the 3 × 3 MIMO LED-to-LED communication system using RGB colors at a data rate of 30.62 kbps over a 10 cm transmission distance along with direct current biased optical orthogonal frequency division multiplexing (DCO-OFDM) modulation and zero-forcing (ZF) equalizer.

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Optical Filter-Less WDM for Visible Light Communications Using Defocused MIMO

Cited by 9 publications

References 18 publications

Electro‐optical spiking neural networks using an enhanced optical axon with pulse amplitude modulation and automatic gain controller

Electro‐optical spiking neural networks using an enhanced optical axon with pulse amplitude modulation and automatic gain controller

MIMO Systems with Neural Networks in OFDM-Based WDM Visible Light Communications

Experimental Demonstration of 3 × 3 MIMO LED-to-LED Communication Using RGB Colors

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