Vertical Optical Fiber Assembly on Silicon Photonic Chips Using 3D-Curved Silicon Waveguide Couplers

Sakakibara, Youichi; Kiriyama, Takashi; Yoshida, Tomoya; Akizuki, Yuki; Omoda, Emiko; Iwasaki, Kazuma; Kato, Takumi

doi:10.1364/ofc.2020.w1a.3

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…In accordance with our demonstration of the optical fiber assembling using a UV adhesive mixed with spacer beads, this distance is controllable. 27) The difference in the distances for a 0.5-dBloss-increment between TE and TM polarizations arises mainly from the difference in the positions of the beam waist along the Z-axis. For the alignment errors in the X and Y axes, the 0.5-dB-loss-increment range was about ±1.5 μm for both polarizations [Figs.…”

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confidence: 99%

Design of aspherical-lensed Si surface optical coupler for coupling with standard single-mode optical fibers

Akizuki

Yoshida

Sakakibara

2020

Jpn. J. Appl. Phys.

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A vertically curved Si surface optical coupler for coupling with 10 μm mode-field-diameter single-mode optical fibers was designed. By introducing a sharpened aspherical SiO2 coupler top with a strong optical focusing effect compared with a conventional hemispherical top, we succeeded in shortening the Si inverse taper which acted as an optical beam expander. In numerical simulations, the designed coupler exhibited coupling losses of 0.6 dB and 0.8 dB for TE and TM polarizations, respectively, and a 0.5-dB-loss-increment bandwidth of 250 nm. Furthermore, its optical alignment sensitivity and return loss were analyzed. Consequently, this device showed a small return loss of about −34 dB without applying an anti-reflection coating.

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confidence: 99%

Design of aspherical-lensed Si surface optical coupler for coupling with standard single-mode optical fibers

Akizuki

Yoshida

Sakakibara

2020

Jpn. J. Appl. Phys.

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Polarization-Insensitive Vertically Curved Si Surface Optical Coupler Bent by Ion Implantation

Yoshida

Akizuki

Omoda

et al. 2020

IEEE Photon. Technol. Lett.

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For input coupling from single-mode optical fibers to photoreceivers made with silicon photonics integrated circuits (Si-PICs), we constructed a polarization-insensitive optical surface coupler with a vertically curved silicon waveguide. The polarization insensitivity was attained by the equalization of the radiative transmission losses of TE and TM polarizations in the vertically curved waveguide (VCW) structure while keeping the straight structure of the spot-size converter (SSC) connected above the curved structure. Numerical simulations revealed that the radius of curvature of 6 µm or larger nearly enabled the equalization, and thus we developed a bending technology using ion implantation to realize simultaneously a VCW radius of curvature of 6 µm and a straight SSC of length 7 µm by varying the implantation angles. The bent silicon core was subsequently coated with SiO 2 by plasma-enhanced chemical vapor deposition to function as a collimation lens. The coupling properties of the fabricated coupler and the single-mode fiber with a mode-field diameter of 5 µm exhibited a polarization dependence loss of less than 0.25 dB, a 1-dB bandwidth of 180 nm, and coupling losses of about 1.6 dB at 1550 nm wavelength. A sharp inversely tapered Si waveguide that affects these characteristics significantly can be formed by applying ArF-immersion lithography on the 45-nm-node and hence fabrication is compatible with mass production processes.

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Core-to-Core Switching Module for 4-Core MCFs Using Silicon Photonics Matrix Switch Incorporating Silicon Vertically Curved Optical Coupler

Yoshida,

Atsumi,

Omoda

et al. 2023

2023 Optical Fiber Communications Conference and Exhibition (OFC)

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Vertical Optical Fiber Assembly on Silicon Photonic Chips Using 3D-Curved Silicon Waveguide Couplers

Abstract: Using UV adhesive mixed with glass spacer beads, vertical surface connection of optical fibers to silicon photonic chips via elephant couplers was realized with wavelength and polarization insensitiveness at temperatures from -18.5°C to 90°C.

Cited by 4 publications

References 5 publications

Design of aspherical-lensed Si surface optical coupler for coupling with standard single-mode optical fibers

Design of aspherical-lensed Si surface optical coupler for coupling with standard single-mode optical fibers

Polarization-Insensitive Vertically Curved Si Surface Optical Coupler Bent by Ion Implantation

Core-to-Core Switching Module for 4-Core MCFs Using Silicon Photonics Matrix Switch Incorporating Silicon Vertically Curved Optical Coupler

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