Free-space transmission with passive 2D beam steering for multi-gigabit-per-second per-beam indoor optical wireless networks

Oh, C. W.; Cao, Zizheng; Tangdiongga, E.; Koonen, Ton

doi:10.1364/oe.24.019211

Cited by 67 publications

(28 citation statements)

References 30 publications

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“…For diffraction-based steering, a coherent optical source (a laser) is required, and there are two broad approaches. A fixed grating can be used with a wavelength tunable source so that the beam is controlled by tuning the wavelength [114], or a programmable phase grating can be used with a fixed wavelength [1]. Tracking is required for these systems, so the beams of light can be pointed appropriately, and in [102] a camera-based system is used, where an LED beacon identifies the position of a terminal and the camera image can be used to locate it.…”

Section: Advanced Configurationsmentioning

confidence: 99%

Transmitter and receiver technologies for optical wireless

O’Brien

Rajbhandari

Chun

2020

Phil. Trans. R. Soc. A.

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Providing a reliable link, with sufficient signal-to-noise ratio (SNR) and bandwidth to deliver high-capacity communications is a critical challenge for optical wireless (OW) communications and understanding and jointly optimizing the performance of the transmitter and receiver subsystems is a key part of this. At the transmitter a source of light, either a laser or a light-emitting diode, must be modulated with the communications signal. The resulting emission must be directed, using optics or steering systems, as required for the particular application, and must be within any safety levels set by relevant standards. The receiver is the most critical part of any optical link, as its design is a dominant factor in determining the received SNR, which determines the capacity and ultimately the utility of the link. A receiver must collect, filter and concentrate signal radiation, then detect and amplify the resulting electrical signal. This review surveys the state-of–the-art transmitter and receiver technologies. Details of design constraints are discussed, and potential future directions discussed. This article is part of the theme issue ‘Optical wireless communication’.

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Section: Advanced Configurationsmentioning

confidence: 99%

Transmitter and receiver technologies for optical wireless

O’Brien

Rajbhandari

Chun

2020

Phil. Trans. R. Soc. A.

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“…However, they have inherent disadvantages of relatively low steering speed and bulky size. Various mechanical-free beam steering methods have been reported recently, such as the use of diffraction gratings based on wavelength tuning [12,[14][15][16], optical phased arrays [17], and a slow-light waveguide amplifier [18]. Key challenges in these free-space or waveguide-based beam steering devices are their high coupling loss with the existing fiber links, and the complicated and expensive setup.…”

Section: Highly Efficient Optical Beam Steering Using Anmentioning

confidence: 99%

“…Wavelength-controlled passive optical beam steering can be achieved using a fixed diffraction optical device [12,[14][15][16]. Optical beams with different wavelengths are diffracted into different spatial positions by the diffraction device.…”

Section: Principlementioning

confidence: 99%

Highly Efficient Optical Beam Steering Using an In-Fiber Diffraction Grating for Full Duplex Indoor Optical Wireless Communication

Wang

Habib

Yan

et al. 2018

J. Lightwave Technol.

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Abstract-Diffraction gratings have been widely used in wavelength-controlled non-mechanical laser beam steering for high data-rate indoor optical wireless communications (OWC). Existing free-space diffraction gratings suffer from inherent difficulties of limited diffraction efficiency, bulky configuration, high cost and significant coupling loss with optical fiber links. In this work, a new optical approach for highly efficient, compact and fiber compatible laser beam steering using an in-fiber diffraction grating is proposed and experimentally demonstrated for the first time to our best knowledge. In-fiber diffraction is made possible based on a 45° tilted fiber grating (TFG), where wavelength dependent lateral scattering is obtained due to the strongly tilted grating structure. Improved diffraction efficiency of 93.5% has been achieved. In addition, the 45° TFG works perfectly for both light emission and reception, enabling full-duplex optical wireless transmission. Utility of the 45° TFG in all-fiber laser beam steering for multi-user full duplex optical wireless communications has been verified in experiments. 1.4 m free-space full-duplex wireless transmission has been demonstrated with data rate up to 12 Gb/s per beam using 2.4 GHz bandwidth OFDM signals.

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“…Microelectromechanical system mirrors [2,3] can be cheaply mass-produced; however, if their diameter is designed to be several millimeters to obtain a sufficiently sharp optical beam, their scanning speed is significantly reduced to below 1 kHz. Therefore, non-mechanical solid-state devices such as optical phased arrays (OPAs) [4][5][6][7][8] and waveguide diffraction gratings [9][10][11] were studied.…”

Section: Introductionmentioning

confidence: 99%

Wavelength-division multiplexing Si photonic crystal beam steering device for high-throughput parallel sensing

et al. 2018

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We proposed and demonstrated a wavelength-division multiplexing (WDM) optical beam-steering device consisting of a thermally controlled doubly periodic Si twodimensional bulk photonic crystal waveguide and coupled microring multiplexers. Beam forming and steering while maintaining a sharp profile is much easier in this device than with optical phased arrays which need the fine phase control. By dividing the range of beamsteering angles into different wavelength channels, it is possible to cover a wide range of angles, even when each angle is small. In this study, we fabricated a device with four wavelength channels, each of which showed beam steering of 4°-5° as a result of heating, resulting in a total of 16°. Two-dimensional steering is also achieved by loading a collimator lens and selecting one waveguide from those arrayed. We evaluated 112 resolution points with four wavelengths and 448 points in total by switching four waveguides. If this WDM concept is introduced into light detection and ranging and the number of wavelengths is increased, it will be possible to increase the sensing throughput, which is usually constrained by the round-trip time of light, by simultaneous parallel operation.

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Free-space transmission with passive 2D beam steering for multi-gigabit-per-second per-beam indoor optical wireless networks

Cited by 67 publications

References 30 publications

Transmitter and receiver technologies for optical wireless

Transmitter and receiver technologies for optical wireless

Highly Efficient Optical Beam Steering Using an In-Fiber Diffraction Grating for Full Duplex Indoor Optical Wireless Communication

Wavelength-division multiplexing Si photonic crystal beam steering device for high-throughput parallel sensing

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