Ultra‐Sharp Multimode Waveguide Bends with Subwavelength Gratings

Wu, Hao; Li, Chenlei; Song, Lijia; Tsang, Hon Ki; Bowers, John E.; Dai, Daoxin

doi:10.1002/lpor.201800119

Cited by 110 publications

(50 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For instance, the bend designed for a waveguide with the effective refractive index of 2.2 results in a bending radius of approximately 55 µm. However, high-index contrast waveguides such as Si waveguides can be bent with small bending radii [11,12,15,35,36]. Based on the procedure described in the previous section, three implementations of the truncated Eaton lens with different periods are presented with periods of Λ=182, 194, and 207 nm.…”

Section: Numerical Simulation and Discussionmentioning

confidence: 99%

Polymer multimode waveguide bend based on a multilayered Eaton lens

2019

View full text Add to dashboard Cite

Reducing the bending radius of low-index contrast waveguides is essential in reducing the size of the integrated optical components. A polymeric multimode waveguide bend is presented based on the Eaton lens. The ray-tracing calculations are utilized to truncate the Eaton lens in order to improve the performance of the bend. The truncation of the lens decreases the footprint of the bend as well. The designed waveguide bend with a radius of 18.4 µm is implemented by concentric cylindrical multilayer structure. The average bend losses of 0.69 and 0.87 dB are achieved for the TM0 and TM1 modes in the C-band of optical communication, respectively. The bend loss is lower than 1 dB in a bandwidth of 1520-1675 nm for both modes.

show abstract

Section: Numerical Simulation and Discussionmentioning

confidence: 99%

Polymer multimode waveguide bend based on a multilayered Eaton lens

2019

View full text Add to dashboard Cite

show abstract

“…The geometry of the SWG provides precise control over the effective index and therefore modal confinement, dispersion, and birefringence, which will be discussed in detail later. The EMT is also applicable to other subwavelength structured waveguides such as the 90° waveguide bend in Figure 1B [12,21]. It consists of trapezoidal silicon segments aligned periodically along a 90° arc.…”

Section: Optical Properties Of Subwavelength Structured Waveguidesmentioning

confidence: 99%

Subwavelength structured silicon waveguides and photonic devices

Sun

Zhang

et al. 2020

Nanophotonics

View full text Add to dashboard Cite

AbstractSubwavelength structures such as subwavelength gratings (SWGs) and subwavelength metamaterials are capable of tailoring the optical properties of materials and controlling the flow of light at the nanoscale. The effective indices of the subwavelength structured strip and slab waveguides can be changed in a wide range by choosing an appropriate duty cycle or a filling factor of silicon, which provides an effective method to manipulate the optical field and achieve effective index matching for functional devices. Recent advances in nanofabrication techniques have made it possible to implement subwavelength structures in silicon strip and slab waveguides. Here we review various approaches used to design subwavelength structures and achieve exotic optical responses and discuss how these structures can be used to realize high-performance silicon photonic devices. Both one-dimensional SWG devices and two-dimensional subwavelength metamaterial devices are covered in this review, including subwavelength structure–based polarization handling devices, mode manipulation devices, and building blocks for integrated optical interconnects. Perspectives on subwavelength structured silicon photonic devices are also discussed.

show abstract

“…Mode converters [1] have been used to achieve a bending radius of 30 µm. A subwavelength grating waveguide bend with a radius of 10 µm has been reported [2]. A waveguide bend with optimized clothoid and normal curves has been studied [3].…”

Section: Introductionmentioning

confidence: 99%

Ultra-thin silicon-on-insulator waveguide bend based on truncated Eaton lens implemented by varying the guiding layer thickness

Badri

Gilarlue

Gavgani

2020

Photonics and Nanostructures - Fundamentals and Applications

View full text Add to dashboard Cite

Silicon-on-insulator (SOI) waveguides with different geometries have been employed to design various integrated optical components. Reducing the bending radius of the SOI waveguides with low bending loss is essential in minimizing the footprint of light-wave circuits. The propagating mode is less confined in the core of the ultra-thin SOI waveguide and penetrates to substrate and cladding, leading to higher bending loss compared with conventional SOI waveguide with the thicker guiding layer. While various bending mechanisms have been utilized to reduce the bending loss of conventional SOI waveguides, the ultra-thin SOI waveguide bends have not been studied in detail. In this paper, we present a 60 nm-thick SOI waveguide bend based on the truncated Eaton lens implemented by varying thickness of the guiding layer. The three-dimensional full-wave simulations reveal that the designed waveguide bend, with a radius of 3.9 μm, reduces the bending loss from 3.3 to 0.42 dB at the wavelength of 1550 nm. Moreover, the bending loss for the wavelength range of 1260-1675 nm is lower than 0.67 dB while the bending loss in the C-band is lower than 0.45 dB.

show abstract

Ultra‐Sharp Multimode Waveguide Bends with Subwavelength Gratings

Cited by 110 publications

References 55 publications

Polymer multimode waveguide bend based on a multilayered Eaton lens

Polymer multimode waveguide bend based on a multilayered Eaton lens

Subwavelength structured silicon waveguides and photonic devices

Ultra-thin silicon-on-insulator waveguide bend based on truncated Eaton lens implemented by varying the guiding layer thickness

Contact Info

Product

Resources

About