scholarly journals Low-loss, compact, and fabrication-tolerant Si-wire 90° waveguide bend using clothoid and normal curves for large scale photonic integrated circuits

2017 ◽  
Vol 25 (8) ◽  
pp. 9150 ◽  
Author(s):  
Takeshi Fujisawa ◽  
Shuntaro Makino ◽  
Takanori Sato ◽  
Kunimasa Saitoh
Keyword(s):  
Integrated Circuits ◽  
Large Scale ◽  
Photonic Integrated Circuits ◽  
Low Loss ◽  
Waveguide Bend

scholarly journals Long Low-Loss-Litium Niobate on Insulator Waveguides with Sub-Nanometer Surface Roughness

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 910 ◽  
Author(s):  
Rongbo Wu ◽  
Min Wang ◽  
Jian Xu ◽  
Jia Qi ◽  
Wei Chu ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Integrated Circuits ◽  
Large Scale ◽  
Photonic Integrated Circuits ◽  
Surface Patterning ◽  
Propagation Loss ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Low Loss ◽  
Atomic Force

In this paper, we develop a technique for realizing multi-centimeter-long lithium niobate on insulator (LNOI) waveguides with a propagation loss as low as 0.027 dB/cm. Our technique relies on patterning a chromium thin film coated on the top surface of LNOI into a hard mask with a femtosecond laser followed by chemo-mechanical polishing for structuring the LNOI into the waveguides. The surface roughness on the waveguides was determined with an atomic force microscope to be 0.452 nm. The approach is compatible with other surface patterning technologies, such as optical and electron beam lithographies or laser direct writing, enabling high-throughput manufacturing of large-scale LNOI-based photonic integrated circuits.

Propagation of Fundamental Mode in Regularly Bending Multi-Mode Waveguides

2021 ◽  
Author(s):  
Hongyan Yu ◽  
Xinyu Sun ◽  
Dasai Ban ◽  
Feng Qiu
Keyword(s):  
Integrated Circuits ◽  
Fundamental Mode ◽  
Large Scale ◽  
Photonic Integrated Circuits ◽  
Optical Field ◽  
Low Loss ◽  
Scattering Loss ◽  
Bending Radius ◽  
Silicon Based ◽  
Multi Mode

Abstract Transmission of the fundamental mode in multi-mode waveguides is an effective scheme for a silicon-based platform to reduce scattering loss. However, the application of the scheme is usually limited to straight waveguides and restricted in multi-mode bending waveguides. This is because the fundamental mode of a straight waveguide is seriously disordered after passing the bend. In this work, we have presented a “matched bending radius” approach, by which an ultra-low loss and negligible modal disorder have been demonstrated in the Si and Si3N4 multi-mode waveguides. The estimated optical field overlap factor is almost 0 dB at the matched bending radius, indicating that the fundamental mode can be re-generated after passing the multi-mode bending waveguide. The proposed approach will contribute to applying the low loss scheme in large-scale photonic integrated circuits.

scholarly journals Low-Loss Lithium Niobate on Insulator (LNOI) Waveguides of a 10 cm-Length and a Sub-Nanometer Surface Roughness

2018 ◽  
Author(s):  
Rongbo Wu ◽  
Min Wang ◽  
Jian Xu ◽  
Jia Qi ◽  
Wei Chu ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Lithium Niobate ◽  
Integrated Circuits ◽  
Large Scale ◽  
Photonic Integrated Circuits ◽  
Propagation Loss ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Low Loss ◽  
Atomic Force

We develop a technique for realizing lithium niobate on insulator (LNOI) waveguides of a multi-centimeter-length with a propagation loss as low as 0.027 dB/cm. Our technique relies on patterning a chromium (Cr) thin film coated on the top surface of LNOI into a hard mask with a femtosecond laser followed by the chemo-mechanical polishing for structuring the LNOI into the waveguides. The surface roughness on the waveguides is determined to be 0.452 nm with an atomic force microscope (AFM). The approach is compatible with other surface patterning technologies such as optical and electron beam lithographies or laser direct writing, enabling high-throughput manufacturing of large-scale LNOI-based photonic integrated circuits.

scholarly journals Wafer-scale low-loss lithium niobate photonic integrated circuits

2020 ◽  
Author(s):  
Kevin Luke ◽  
Prashanta Kharel ◽  
Christian Reimer ◽  
Lingyan He ◽  
Marko Loncar ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Integrated Circuits ◽  
Photonic Integrated Circuits ◽  
Low Loss ◽  
Wafer Scale

scholarly journals Low-Loss and Broadband Silicon Photonic 3-dB Power Splitter with Enhanced Coupling of Shallow-Etched Rib Waveguides

2020 ◽  
Vol 10 (13) ◽  
pp. 4507
Author(s):  
Vinh Huu Nguyen ◽  
In Ki Kim ◽  
Tae Joon Seok
Keyword(s):  
Integrated Circuits ◽  
Large Scale ◽  
Low Loss ◽  
Critical Dimensions ◽  
Power Splitter ◽  
Excess Loss ◽  
Silicon Photonic ◽  
Essential Components ◽  
Rib Waveguides ◽  
Power Splitters

A silicon photonic 3-dB power splitter is one of the essential components to demonstrate large-scale silicon photonic integrated circuits (PICs), and can be utilized to implement modulators, 1 × 2 switches, and 1 × N power splitters for various PIC applications. In this paper, we reported the design and experimental demonstration of low-loss and broadband silicon photonic 3-dB power splitters. The power splitter was realized by adiabatically tapered rib waveguides with 60-nm shallow etches. The shallow-etched rib waveguides offered strong coupling and relaxed critical dimensions (a taper tip width of 200 nm and gap spacing of 300 nm). The fabricated device exhibited an excess loss as low as 0.06 dB at a 1550-nm wavelength and a broad operating wavelength range from 1470 nm to 1570 nm. The relaxed critical dimensions (≥200 nm) make the power splitter compatible with standard fabrication processes of existing silicon photonics foundries.

scholarly journals Low-loss, compact, spot-size-converter based vertical couplers for photonic integrated circuits

2019 ◽  
Vol 52 (21) ◽  
pp. 214001 ◽  
Author(s):  
P K J Singaravelu ◽  
G C R Devarapu ◽  
Sebastian A Schulz ◽  
Quentin Wilmart ◽  
Stéphane Malhouitre ◽  
...  
Keyword(s):  
Integrated Circuits ◽  
Photonic Integrated Circuits ◽  
Spot Size ◽  
Low Loss
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