WDM-Compatible Polarization-Diverse OAM Generator and Multiplexer in Silicon Photonics

Chen, Yuxuan; Lin, Zhongjin; Villers, Simon Bélanger-de; Rusch, Leslie A.; Shi, Wei

doi:10.1109/jstqe.2019.2941488

Cited by 24 publications

(14 citation statements)

References 26 publications

(29 reference statements)

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“…The pixel grayscale data of a 2D image is flattened into a one‐dimensional vector and loaded simultaneously on two wavelengths (1546 and 1550 nm). The beam is combined after passing through a wavelength division multiplexer [ 47 ] and modulated by the device. The device performs binary intensity modulation on the input light field, with a modulation voltage of 0 or 10 V. The modulation value of the device is determined based on the value of the target Hadamard matrix.…”

Section: Resultsmentioning

confidence: 99%

Dynamic Spectral Modulation on Meta‐Waveguides Utilizing Liquid Crystal

Dong,

Zhou,

et al. 2023

Advanced Science

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The integration of metasurfaces and optical waveguides is gradually attracting the attention of researchers because it allows for more efficient manipulation and guidance of light. However, most of the existing studies focus on passive devices, which lack dynamic modulation. This work utilizes the meta‐waveguides with liquid crystal(LC) to modulate the on‐chip spectrum, which is the first experimentally verified, to the authors' knowledge. By applying a voltage, the refractive index of the liquid crystal surrounding the meta‐waveguides can be tuned, resulting in a blue shift of the spectrum. The simulation shows that the 18.4 dB switching ratio can be achieved at 1550 nm. The meta‐waveguides are prepared using electron beam lithography (EBL), and the improved transmittance of the spectrum in the short wavelength is experimentally verified, which is consistent with the simulation trend. At 1551.64 nm wavelength, the device achieves a switching ratio of ≈16 dB with an active area of 8 µm × 0.4 µm. Based on this device, an optoelectronic computing architecture for the Hadamard matrix product and a novel wavelength selection switch are proposed. This work offers a promising avenue for on‐chip dynamic modulation in integrated photonics, which has the advantage of a compact active area, fast response time, and low energy consumption compared to conventional thermal‐light modulation.

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Section: Resultsmentioning

confidence: 99%

Dynamic Spectral Modulation on Meta‐Waveguides Utilizing Liquid Crystal

Dong,

Zhou,

et al. 2023

Advanced Science

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“…, and their cosine similarity can be expressed as Eq (9) ranging from 0 to 1, which means weaker correlation and strong correlation or exactly same between two vectors. The similarity between two pictures by different models can be quantitatively evaluated using the cosine similarity.…”

Section: Consider Two Known Vectorsmentioning

confidence: 99%

“…ntegrated OAM vortex beam emitter [1][2][3][4][5][6][7][8][9], with its advantages of small footprint, tunability and large-scale mass production, has become an important method for vortex beam generation. Lots of Integrated emitters, like microring resonator [1][2][3][4] or cobweb structure [5][6][7][8][9] have been made, which usually use emission points to send out wavelets. They interfere in space to procedure OAM vortex beam.…”

Section: Introductionmentioning

confidence: 99%

A Theoretical Description of Integrated OAM Beam Emitters Using Conical Wave Model

et al. 2022

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A theoretical model, suitable for multiple structures of integrated vortex beam emitters, is proposed, developed and verified. Using the interference superposition of multiple plane waves in the far-field plane, which have the same wavevector in the z-direction, the expressions of the orbital angular momentum (OAM) beam field emitted from integrated devices are obtained. The results are applicable to OAM beams with larger or fractional topological charges, and consider different initial polarization states, which means different structures. Especially, when ϑ = 0, p = 0, the result is the same as those derived from the dipole model and is consistent with the previous experimental results. The calculated results show that it can obtain more accurate far-field light field with topological charge l increasing gradually and gain the same Ex and Ey with different initial polarization states. By constructing this model, the generation mechanism of the integrated OAM beam emitters can be easily understood and the beam vortex can be generated naturally and flexibly.

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“…OAM modes are characterized by helical phase fronts that can be obtained by MRRs with periodically coupled emitters [254][255][256][257], superposed holographic fork gratings [258], and star couplers [259][260][261][262]. OAM generators based on MRRs are ultracompact and can be flexibly engineered for high-order OAM.…”

Section: Optical Interfaces For Oam Modes (De) Multiplexingmentioning

confidence: 99%

“…Most OAM generators demonstrated on silicon are in cylindrical polarization (either azimuthal or radial) [254,256,257,259,264]. Using two star couplers and 2D antennas, a circularly polarized OAM generator/multiplexer was proposed [261] and experimentally demonstrated [262]. The block diagram is illustrated in Figure 24(a).…”

Section: Optical Interfaces For Oam Modes (De) Multiplexingmentioning

confidence: 99%

Scaling capacity of fiber-optic transmission systems via silicon photonics

2020

Self Cite

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The tremendous growth of data traffic has spurred a rapid evolution of optical communications for a higher data transmission capacity. Next-generation fiber-optic communication systems will require dramatically increased complexity that cannot be obtained using discrete components. In this context, silicon photonics is quickly maturing. Capable of manipulating electrons and photons on the same platform, this disruptive technology promises to cram more complexity on a single chip, leading to orders-of-magnitude reduction of integrated photonic systems in size, energy, and cost. This paper provides a system perspective and reviews recent progress in silicon photonics probing all dimensions of light to scale the capacity of fiber-optic networks toward terabits-per-second per optical interface and petabits-per-second per transmission link. Firstly, we overview fundamentals and the evolving trends of silicon photonic fabrication process. Then, we focus on recent progress in silicon coherent optical transceivers. Further scaling the system capacity requires multiplexing techniques in all the dimensions of light: wavelength, polarization, and space, for which we have seen impressive demonstrations of on-chip functionalities such as polarization diversity circuits and wavelength- and space-division multiplexers. Despite these advances, large-scale silicon photonic integrated circuits incorporating a variety of active and passive functionalities still face considerable challenges, many of which will eventually be addressed as the technology continues evolving with the entire ecosystem at a fast pace.

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WDM-Compatible Polarization-Diverse OAM Generator and Multiplexer in Silicon Photonics

Cited by 24 publications

References 26 publications

Dynamic Spectral Modulation on Meta‐Waveguides Utilizing Liquid Crystal

Dynamic Spectral Modulation on Meta‐Waveguides Utilizing Liquid Crystal

A Theoretical Description of Integrated OAM Beam Emitters Using Conical Wave Model

Scaling capacity of fiber-optic transmission systems via silicon photonics

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