Multimode optical waveguide enabling microbends with low inter-mode crosstalk for mode-multiplexed optical interconnects

Dai, Daoxin

doi:10.1364/oe.22.027524

Cited by 38 publications

(14 citation statements)

References 25 publications

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“…The mode division multiplexing (MDM) has been proposed to scale up the capacity with a single wavelength carrier, where independent signals are carried by different eigenmodes in parallel . Over the recent years, numerous key elements in the multimode transmission system have been reported, including the mode (de)multiplexers, multimode switches, and multimode bent waveguides . The waveguide crossing is essential in the on‐chip photonic circuit to obtain the complex topology of interconnects .…”

Section: Introductionmentioning

confidence: 99%

“…[6] Over the recent years, numerous key elements in the multimode transmission system have been reported, including the mode (de)multiplexers, [7][8][9] DOI: 10.1002/lpor.201800094 multimode switches, [10][11][12][13] and multimode bent waveguides. [14][15][16] The waveguide crossing is essential in the on-chip photonic circuit to obtain the complex topology of interconnects. [17][18][19][20] However, the conventional waveguide crossings only work for the single mode, which makes it difficult to route the multimode waveguide and limits the integration density for the on-chip multimode communication systems.…”

Section: Introductionmentioning

confidence: 99%

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Metamaterial‐Based Maxwell's Fisheye Lens for Multimode Waveguide Crossing

Shi

2018

Laser & Photonics Reviews

100

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On‐chip multimode transmission has drawn tremendous interest for its ability to expand the link capacity with a single wavelength carrier. The waveguide crossing is a basic component in the on‐chip photonic circuit allowing the routing of a complex network. The situation has arisen where the multimode waveguide crossing is required to achieve the high‐density multimode networks. However, the conventional designs of the waveguide crossing only work for the single‐mode. Some works have been reported which realize the multimode crossing, but all suffer from significant losses. Here a multimode waveguide star‐crossing is proposed using the metamaterial‐based Maxwell's fisheye lens, where four multimode waveguides converge at a single junction. The index‐engineered silicon metamaterial is utilized to obtain the Maxwell's fisheye lens on the silicon‐on‐insulator platform. By combining the Maxwell's fisheye lens and tapered waveguides, both TM0 and TM1 modes propagate through the star‐crossing with low losses and cross talk. The fabricated multimode waveguide star‐crossing shows low losses of <0.3 dB and cross talk of <‐20 dB.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Metamaterial‐Based Maxwell's Fisheye Lens for Multimode Waveguide Crossing

Shi

2018

Laser & Photonics Reviews

100

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“…The coupling coefficients ζ ν m , κ ν m , ς m , ι ν , and m are given in (13), (14), (17), (19), and (20), respectively.…”

Section: Solution Of the Coupled-mode Equationsmentioning

confidence: 99%

“…The operating wavelength is 1550 nm. The corresponding coupling coefficients are evaluated from (13), (14), (17), (19), and (20).…”

Section: B Example 1: Slab Waveguide With Three Te Modesmentioning

confidence: 99%

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Bi-Directional Coupler as a Mode-Division Multiplexer/Demultiplexer

Shalaby

2016

J. Lightwave Technol.

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A bi-directional coupler supported with Bragg grating is proposed as a mode-division multiplexer/demultiplexer. The structure can demultiplex 3 modes with only two waveguides and a Bragg grating. The input waveguide is multimode, while the output waveguide is single-mode. Both first-and second order modes of the input waveguide are coupled to the output waveguide, propagating at opposite directions, while the fundamental mode is kept in the input waveguide. A theoretical analysis of the proposed demultiplexer is developed based on the perturbative mode-coupled theory. The insertion losses of both first-and second order modes are derived under suitable phase-matched conditions. Expressions of the insertion losses are obtained for simple slab-waveguides coupler. Numerical results of the proposed demultiplexer are presented for the slabwaveguides coupler under different design parameters. Furthermore, the wavelength dependence of the device is addressed under mismatching conditions and a Lorentzian model of the Silicon material. In addition, FDTD simulation of proposed demultiplexer is performed to prove the validity of the proposed concept. Return loss due to reflection to the source is taken into consideration in the simulation in addition to the device wavelength dependence.

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Ultra‐Sharp Multi‐Mode Waveguide Bending Assisted with Metamaterial‐Based Mode Converters

Shi

2018

Laser & Photonics Reviews

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On-chip multi-mode communication has attracted much attention for its potential to greatly expand the bandwidth of data transmission. However, the application of multi-mode transmission is still restricted since the multi-mode waveguide can't be compactly routed, especially in the sharp bending region. The challenge lies in decreasing the significant inter-mode coupling in the multi-mode bending with a small radius. Few works have been reported to achieve multi-mode bending, but all suffer from the complex fabrication. In this paper, an ultra-sharp multi-mode waveguide is proposed, which is assisted with metamaterial-based mode converters. The sub-wavelength structures are directly written onto the polymer cladding. By engineering the effective medium index of the metamaterial cladding in the mode converters, the inter-mode coupling is dramatically inhibited. The fabricated sharp bending with a 30-μm radius shows that the crosstalk is <−20 dB and the loss is <1 dB over a >80 nm wavelength band.

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Multimode optical waveguide enabling microbends with low inter-mode crosstalk for mode-multiplexed optical interconnects

Cited by 38 publications

References 25 publications

Metamaterial‐Based Maxwell's Fisheye Lens for Multimode Waveguide Crossing

Metamaterial‐Based Maxwell's Fisheye Lens for Multimode Waveguide Crossing

Bi-Directional Coupler as a Mode-Division Multiplexer/Demultiplexer

Ultra‐Sharp Multi‐Mode Waveguide Bending Assisted with Metamaterial‐Based Mode Converters

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