Low-Loss and Broadband Optical Coupler Based on Lensed-Top Vertically Curved Silicon Waveguide

The high-performance silicon optical coupler is one of the significant functional devices, which will be required to enable mass commercialization of silicon photonic integrated circuits (Si-PICs). In this work, we investigated the bending shapes for each device length and have successfully fabricat...

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Bibliographic Details
Published in:IEEE photonics technology letters 2019-04, Vol.31 (8), p.603-606
Main Authors: Atsumi, Yuki, Yoshida, Tomoya, Omoda, Emiko, Sakakibara, Youichi
Format: Article
Language:English
Subjects:
Bandwidths
Bending machines
Broadband
Commercialization
Couplers
Coupling
Couplings
Curved beams
Electric polarization
Integrated circuits
Ion implantation
Optical coupling
Optical device fabrication
Optical fibers
optical surface coupler
optoelectronic device
Photonics
Silicon
silicon photonics
Wavelength division multiplexing
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Summary:The high-performance silicon optical coupler is one of the significant functional devices, which will be required to enable mass commercialization of silicon photonic integrated circuits (Si-PICs). In this work, we investigated the bending shapes for each device length and have successfully fabricated a very low-loss and broadband 5-μm-beam-spot surface optical coupler based on a lensed-top vertically curved silicon waveguide by adjusting the dose conditions used in the ion implantation process. The fabricated device showed a coupling loss of 2.4 dB, which included a waveguide loss of approximately 0.5 dB and a 0.5-dB-loss bandwidth of more than 220 nm for the transverse electric polarization in the 1.55-μm wavelength band. This coupling device will greatly contribute to the progress in the development of Si-PICs using the coarse wavelength division multiplexing technique.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2019.2903233