A Fully Numerical Method for Designing Efficient Adiabatic Mode Evolution Structures (Adiabatic Taper, Coupler, Splitter, Mode Converter) Applicable to Complex Geometries

Liang, Tu-Lu; Tu, Yanfei; Chen, Xi; Huang, Yingyan; Bai, Qiang; Zhao, Yixuan; Zhang, Junchi; Yuan, Yutong; Li, Junyu; Yi, Fei; Shao, Wei; Ho, Seng-Tiong

doi:10.1109/jlt.2021.3085306

Cited by 12 publications

(16 citation statements)

References 34 publications

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“…Further improvement on coupling efficiency of grating coupler is realizable with the help of bottom metal mirror [ 70 ], apodized grating [ 71 ], and inverse design methods such as intelligent algorithms [ 72 ] and deep neural networks (DNNs) [ 73 ]. As for mode converter, multi-stage [ 74 ] or adiabatic taper [ 75 , 76 ] are beneficial to improvement of conversion efficiency. Multi-tip [ 77 , 78 ] or multi-layer [ 79 ] structures are capable of enhancing coupling efficiency from photonic chip to lensed fibers whilst making the device ultra-compact.…”

Section: Discussionmentioning

confidence: 99%

Integrated Polarization-Splitting Grating Coupler for Chip-Scale Atomic Magnetometer

Liang

et al. 2022

Biosensors

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Atomic magnetometers (AMs) are widely acknowledged as one of the most sensitive kind of instruments for bio-magnetic field measurement. Recently, there has been growing interest in developing chip-scale AMs through nanophotonics and current CMOS-compatible nanofabrication technology, in pursuit of substantial reduction in volume and cost. In this study, an integrated polarization-splitting grating coupler is demonstrated to achieve both efficient coupling and polarization splitting at the D1 transition wavelength of rubidium (795 nm). With this device, linearly polarized probe light that experienced optical rotation due to magnetically induced circular birefringence (of alkali medium) can be coupled and split into individual output ports. This is especially advantageous for emerging chip-scale AMs in that differential detection of ultra-weak magnetic field can be achieved through compact planar optical components. In addition, the device is designed with silicon nitride material on silicon dioxide that is deposited on a silicon substrate, being compatible with the current CMOS nanofabrication industry. Our study paves the way for the development of on-chip AMs that are the foundation for future multi-channel high-spatial resolution bio-magnetic imaging instruments.

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Section: Discussionmentioning

confidence: 99%

Integrated Polarization-Splitting Grating Coupler for Chip-Scale Atomic Magnetometer

Liang

et al. 2022

Biosensors

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“…1.25 µm to W 2 = 1.05 µm, (e) Sect-5: W 1 = 1.05 µm to W 2 = 0.9 µm, (f) Sect-6: W 1 = 0.9 µm to W 2 = 0.5 µm. The taper division scheme (such as the numbers of sections and the width variation for each section) were discussed in detail in our previous study [1]. Briefly, the higher the division number N DIV of the SLA/AO-SLA taper, the better the curve of the final structure used for the design, and also the better the results given by the obtained MCTE curve.…”

Section: Adiabatic Operation Slope-loss Algorithm (Ao-sla)mentioning

confidence: 99%

“…The adiabatic waveguide taper is used to change the size and shape of the optical beam mode to achieve a high mode-connection power transfer efficiency (MCTE) [1] between two different waveguides. Thus, the adiabatic taper involves transferring a particular eigenmode by varying the waveguide structures from the input to output.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, an efficient adiabatic operation slope-loss algorithm (AO-SLA) is presented for the design of adiabatic waveguide tapers. A waveguide taper was first designed by SLA [1] to obtain a better design effect and the proposed AO-SLA can use the same divisions of SLA. The design rule of each section to ensure adiabatic operation in the adiabatic waveguide taper was based on the equation proposed by Milton and Burns in 1977 [11, 12].…”

Section: Introductionmentioning

confidence: 99%

“…2 General descriptions of AO-SLA Same as [1], the power transfer efficiency is referred to as "mode-connection power transfer efficiency" (MCTE), the percentage of power loss is referred to as "mode-connection power loss fraction" (MCLF), and the maximum value is referred to as "maximum mode-connection power loss fraction" (MMCLF) [1].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Adiabatic operation slope-loss algorithm for ultrashort and broadband waveguide taper

Liang

Cheng²,

Yu³

et al. 2022

Front. Phys.

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In this paper, an adiabatic operation slope-loss algorithm (AO-SLA) is developed for designing efficient adiabatic waveguide tapers. The algorithm can compute the efficient adiabatic guided-wave shape of the waveguide taper. A well-studied case of an adiabatic waveguide taper is used to show how it can readily generate a guided-wave shape that gives the same mode-connection power transfer with a much shorter length compared with the linear shape. In the waveguide taper design, it is shown that the device efficiency designed with AO-SLA is better than that based on the parabolic case and the SLA case, and the adiabatic taper designed can give a broad operating bandwidth. Moreover, the adiabatic condition α for AO-SLA can be very large.

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Design of Ultra-Compact Adiabatic Mode Circulator based on Adiabatic Mode Evolutions

Liang,

Shao,

et al. 2024

Silicon

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A Fully Numerical Method for Designing Efficient Adiabatic Mode Evolution Structures (Adiabatic Taper, Coupler, Splitter, Mode Converter) Applicable to Complex Geometries

Cited by 12 publications

References 34 publications

Integrated Polarization-Splitting Grating Coupler for Chip-Scale Atomic Magnetometer

Integrated Polarization-Splitting Grating Coupler for Chip-Scale Atomic Magnetometer

Adiabatic operation slope-loss algorithm for ultrashort and broadband waveguide taper

Design of Ultra-Compact Adiabatic Mode Circulator based on Adiabatic Mode Evolutions

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