Integrated transceivers for optical wireless communications

O’Brien, Dominic; Faulkner, Grahame; Zyambo, E.B.; Jim, K.; Edwards, D.J.; Stavrinou, Paul N.; Parry, G.; Bellon, J.; Sibley, Martin J.N.; Lalithambika, Vinod A.; Joyner, Valencia M.; Samsudin, Rina J.; Holburn, DM; Mears, R.J.

doi:10.1109/jstqe.2004.841471

Cited by 87 publications

(41 citation statements)

References 16 publications

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“…A 2-D vertical cavity surface emitting Laser diode (VCSEL) or resonant cavity LED (RCLED) array, flip-chip bonded to CMOS driver circuitry, allows for a highly-integrated transmitter solution [19], [20]. The driver circuitry is capable of controlling each element's emitted power, along with any other signal processing techniques currently realisable in CMOS.…”

Section: A Source Receiver and Reflector Modelmentioning

confidence: 99%

A Genetic Algorithm Method for Optical Wireless Channel Control

Higgins

Green

Leeson

2009

J. Lightwave Technol.

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Section: A Source Receiver and Reflector Modelmentioning

confidence: 99%

A Genetic Algorithm Method for Optical Wireless Channel Control

Higgins

Green

Leeson

2009

J. Lightwave Technol.

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“…An integrated solid-state array of transceivers has been designed to operate at 155 Mbps per pixel, where arrays of resonant cavity light-emitting diodes are bonded to arrays of CMOS driver circuits [22].…”

Section: Spatial Discrete Multitone Modulationmentioning

confidence: 99%

Two-dimensional binary halftoned optical intensity channels

Mohamed¹,

Hranilovic²

2008

IET Commun.

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This paper considers the capacity of two-dimensional optical intensity channels in which transmit images are constrained to be binary-level. Examples of such links exist in holographic storage, page-oriented memories, optical interconnects, two-dimensional barcodes, as well as MIMO wireless optical links. Data are transmitted by sending a series of time-varying binary-level optical intensity images from transmitter to receiver. Strict spatial alignment between transmitter and receiver is not required nor is independence among the spatial channels assumed. Our approach combines spatial discrete multitone modulation developed for spatially frequency selective channels with halftoning to produce a binary-level output image. Data is modulated in spatial frequency domain as dictated by a water pouring spectrum over the optical transfer function as well as channel and quantization noise. A binary-level output image is produced by exploiting the excess spatial bandwidth available at the transmitter to shape quantization noise out of band. We present a general mathematical framework in which such systems can be analyzed and designed. In a pixelated wireless optical channel application, halftoning achieves 99.8% of the capacity of an equivalent unconstrained continuous amplitude channel using 1 megapixel arrays.

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“…A diffusion spot geometry is formed using either multiple optical sources [16], or a 2-D array of either vertical cavity surface emitting Laser diodes (VCSELs) or resonant cavity LEDs (RCLEDs), flip-chip bonded to CMOS driver circuitry [17,18]. For the case of multiple optical sources the radiation profile can be controlled via lenses or other diffuser techniques [19], but typically the source is an LED which emits radiation with a generalised Lambertian radiation intensity pattern [20].…”

Section: Source Receiver and Reflector Modelmentioning

confidence: 99%

Receiver alignment dependence of a GA controlled optical wireless transmitter

Higgins¹,

Green²,

Leeson³

2009

J. Opt. A: Pure Appl. Opt.

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Abstract. A genetic algorithm controlled multispot transmitter is demonstrated to be capable of optimising the received power distribution for single element receivers in fully diffuse mobile indoor optical wireless systems. By dynamically modifying the intensity of individual diffusion spots, the transmitter is capable of compensating for changes in receiver alignment, user movement and surface reflectivity characteristics, with negligible impact to bandwidth and RMS delay spread. The dynamic range, referenced against the peak received power, can be reduced by up to 27% when the room is empty, and up to 26% with user movement and variable receiver alignment. Furthermore, received power perturbation, induced by user movement, is reduced from 10% to 2.5%. This method shows potential for providing a highly adaptable solution of overcoming channel variability whilst also reducing receiver complexity.

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Integrated transceivers for optical wireless communications

Cited by 87 publications

References 16 publications

A Genetic Algorithm Method for Optical Wireless Channel Control

A Genetic Algorithm Method for Optical Wireless Channel Control

Two-dimensional binary halftoned optical intensity channels

Receiver alignment dependence of a GA controlled optical wireless transmitter

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