Unclad Microphotonic Waveguide Bend

We present a procedure to enhance the transmission efficiency of a photonic crystal slab waveguide bend by introducing an air hole with the same radius at the center of bend and optimizing the positions of three neighboring holes in the corner. The improvement relies only on the method of displacing holes which is technologically preferred to controlling variations in hole size or shape. We employ the effective refractive index approach and two-dimensional plane wave expansion method to analyze the guide modes of the straight waveguide and waveguide bend. The transmission character of bent waveguides is investigated using two-dimensional finite-difference time-domain method. Numerical studies demonstrate that the approximate method of mode analysis is unsuitable to our model. Alternatively, we systematically study the effect of different positions of the holes on the transmission. The optimized bends for the high transmission with broad bandwidth are proposed.

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Research on Broadband High-power Compact Oversized TE01 Hexa-polar Waveguide Bend

10.1109/ivec45766.2020.9520515 ◽

2020 ◽

Author(s):

Ding Li ◽

Zewei Wu ◽

Xiaoyi Liao ◽

Yong Luo

Keyword(s):

High Power ◽

Waveguide Bend

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Inverse-designed all-dielectric waveguide bend

10.1117/12.2236685 ◽

2016 ◽

Author(s):

F. Callewaert ◽

K. Aydin

Keyword(s):

Dielectric Waveguide ◽

Waveguide Bend

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Fully three-dimensional analysis of a photonic crystal assisted silicon on insulator waveguide bend

International Journal of Modern Physics B ◽

10.1142/s0217979218503447 ◽

2018 ◽

Vol 32 (31) ◽

pp. 1850344 ◽

Cited By ~ 1

Author(s):

N. Eti ◽

Z. Çetin ◽

H. S. Sözüer

Keyword(s):

Photonic Crystal ◽

Numerical Study ◽

Fdtd Method ◽

Three Dimensional ◽

Silicon On Insulator ◽

Geometrical Parameters ◽

Low Loss ◽

Bending Loss ◽

Difference Time ◽

Waveguide Bend

A detailed numerical study of low-loss silicon on insulator (SOI) waveguide bend is presented using the fully three-dimensional (3D) finite-difference time-domain (FDTD) method. The geometrical parameters are optimized to minimize the bending loss over a range of frequencies. Transmission results for the conventional single bend and photonic crystal assisted SOI waveguide bend are compared. Calculations are performed for the transmission values of TE-like modes where the electric field is strongly transverse to the direction of propagation. The best obtained transmission is over 95% for TE-like modes.

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SOI multimode waveguide bend with radially bridged SWGs for broadband (de)multiplexing -INVITED

EPJ Web of Conferences ◽

10.1051/epjconf/202125501003 ◽

2021 ◽

Vol 255 ◽

pp. 01003

Author(s):

Kevan K. MacKayt ◽

Winnie N. Ye

Keyword(s):

Effective Radius ◽

Silicon On Insulator ◽

Propagation Loss ◽

Multimode Waveguide ◽

Broad Bandwidth ◽

Subwavelength Grating ◽

Mode Division Multiplexing ◽

Design Choice ◽

Design Freedom ◽

Waveguide Bend

A novel broadband multimode waveguide bend is proposed that supports the propagation of multiple TE modes on a silicon-on-insulator platform. The gradient curvature bend utilizes trapezoidal subwavelength grating (SWG) segments, connected by adiabatically tapered radial strips to achieve efficient mode (de)multiplexing. The inclusion of the radial strips offers an extra degree of design freedom, allowing the realization of a multimode bend with only one single full etch step. The access waveguide has a width of 2.075 μm with an effective radius of 10 μm. Propagation loss for all modes remains below 2.96 dB, and intermodal crosstalk has a maximum of -19 dB across a broad bandwidth of 100 nm, centred at 1550 nm. This work presents an excellent design choice for broadband mode-division multiplexing operations.

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