Wavelength Demultiplexer Designs Operating Over Multiple Spatial Modes of a Rectangular Waveguide

Blau, Miri; Marom, Dan M.

doi:10.1109/jstqe.2019.2909166

Cited by 9 publications

(3 citation statements)

References 23 publications

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“…[1][2][3][4] Besides the already commercialized wavelength division multiplexing technology, the mode-division multiplexing (MDM) technology is newly proposed in recent years to increase the transmission capacity of the optical transmission systems. [5][6][7][8][9][10][11][12] The on-chip MDM technology uses DOI: 10.1002/lpor.202100162 multimode waveguides bearing information from different subscribers with several guided modes to multiply the bandwidth of the optical interconnects. [13,14] However as the bandwidths are improved by the application of these multimode waveguides, the sizes of the integrated systems can be also enlarged drastically since the multimode waveguide bends have much larger bending radii compared to their single-mode counterparts.…”

Section: Introductionmentioning

confidence: 99%

Inverse Design of Ultra‐Compact Multimode Waveguide Bends Based on the Free‐Form Curves

Sun

Dong

Zhang

et al. 2021

Laser & Photonics Reviews

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On-chip mode-division multiplexing (MDM) can increase the transmission capacity of a single optical bus waveguide. It is of great significance for the MDM systems to design the multimode waveguide bends (MWBs) with compact sizes. A method of designing the MWB using the inverse design algorithm is presented in this paper. Ultra-compact MWBs with high performances are realized by changing the curvature radius of the waveguide curve, and the fabrication process only requires a single step photo-lithography and plasma etching. The three-mode bent waveguide with an effective radius of only 9.35 µm is designed and tested. The theoretical excess losses of TE 0 , TE 1 , and TE 2 mode are less than 0.04 dB in a wide spectral range of 1500 to 1600 nm, and the crosstalks between all guided modes are all less than −29 dB. For the fabricated 90°waveguide bend the measured excess losses are 0.17, 0.04, and 0.16 dB at the central wavelength of 1550 nm, respectively, and the crosstalks between all three modes are less than −21 dB in the wavelength range from 1520 to 1600 nm. The proposed design method can be also extended to more mode-channels.

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Section: Introductionmentioning

confidence: 99%

Inverse Design of Ultra‐Compact Multimode Waveguide Bends Based on the Free‐Form Curves

Sun

Dong

Zhang

et al. 2021

Laser & Photonics Reviews

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show abstract

“…These shapes influence the modal structure of the propagating light and have a potential for improving the optical properties. A rectangular-core MMF can be used to match rectangular on-chip waveguides for wavelength demultiplexing [18]. On the other hand, conservation of the wave vector in a short rigid square-core MMF provides new opportunities for nonlinear imaging [19].…”

Section: Introductionmentioning

confidence: 99%

Comparison of round- and square-core fibers for sensing, imaging, and spectroscopy

et al. 2021

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Multimode fibers (MMFs) show great promise as miniature probes for sensing, imaging and spectroscopy applications. Different parameters of the fibers, such as numerical aperture, refractive index profile and length, have been already optimized for better performance. Here we investigate the role of the core shape, in particular for wavefront shaping applications where a focus is formed at the output of the MMF. We demonstrate that in contrast to a conventional round-core MMF, a square-core design doesn't suffer from focus aberrations. Moreover, we find that how the interference pattern behind a square-core fiber decorrelates with the input frequency is largely independent of the input light coupling. Finally, we demonstrate that a square core shape provides an on-average uniform distribution of the output intensity, free from the input-output correlations seen in round fibers, showing great promise for imaging and spectroscopy applications.

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“…The MDM device also enables spectrally efficient WDM due to its non-resonant operation. Additionally, in combination with inverse-designed beam emitters and a multimode-matched fibre 30,31 , we demonstrate chip-to-chip data transmission across four spatial mode channels between separate silicon chips. In contrast to the previous work 22,23 , the photonic inverse design of the MDM components is fully compatible with commercial foundries for the fabrication of photonic-electronic systems, and exhibits low loss in large bandwidth necessary to demonstrate full communication systems.…”

mentioning

confidence: 99%

Multi-dimensional data transmission using inverse-designed silicon photonics and microcombs

et al. 2022

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The use of optical interconnects has burgeoned as a promising technology that can address the limits of data transfer for future high-performance silicon chips. Recent pushes to enhance optical communication have focused on developing wavelength-division multiplexing technology, and new dimensions of data transfer will be paramount to fulfill the ever-growing need for speed. Here we demonstrate an integrated multi-dimensional communication scheme that combines wavelength- and mode- multiplexing on a silicon photonic circuit. Using foundry-compatible photonic inverse design and spectrally flattened microcombs, we demonstrate a 1.12-Tb/s natively error-free data transmission throughout a silicon nanophotonic waveguide. Furthermore, we implement inverse-designed surface-normal couplers to enable multimode optical transmission between separate silicon chips throughout a multimode-matched fibre. All the inverse-designed devices comply with the process design rules for standard silicon photonic foundries. Our approach is inherently scalable to a multiplicative enhancement over the state of the art silicon photonic transmitters.

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Wavelength Demultiplexer Designs Operating Over Multiple Spatial Modes of a Rectangular Waveguide

Cited by 9 publications

References 23 publications

Inverse Design of Ultra‐Compact Multimode Waveguide Bends Based on the Free‐Form Curves

Inverse Design of Ultra‐Compact Multimode Waveguide Bends Based on the Free‐Form Curves

Comparison of round- and square-core fibers for sensing, imaging, and spectroscopy

Multi-dimensional data transmission using inverse-designed silicon photonics and microcombs

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