GaN waveguide directional coupler for optical quantum information processing systems (Conference Presentation)

Junya Miwa; Masafumi Kihira; Keishi Shiomi; Yasufumi Fujiwara; Masahiro Uemukai; Ryuji Katayama

doi:10.1117/12.2510634

13 March 2019 GaN waveguide directional coupler for optical quantum information processing systems (Conference Presentation)

Junya Miwa, Masafumi Kihira, Keishi Shiomi, Yasufumi Fujiwara, Masahiro Uemukai, Ryuji Katayama

Author Affiliations +

Proceedings Volume 10918, Gallium Nitride Materials and Devices XIV; 109180J (2019) https://doi.org/10.1117/12.2510634
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

Waveguide Mach-Zehnder interferometers (MZIs) composed of two directional couplers (DCs) are widely used as basic building blocks in the optical communications systems and photonic quantum circuits. Since nitride semiconductors have a strong electro-optic effect, they are suitable for implementation of the fast electric-field driven phase shifters in MZIs. In addition, based on its strong optical nonlinearity, the nitride semiconductors can be applied to the quantum light source of 800 nm band via an optical parametric down conversion process. By integration of the nitride-based waveguide MZI devices and the InGaN laser diodes pumped high-efficiency quantum light sources, novel quantum information processing systems made of single material can be expected. In this work, we report on the design, fabrication and evaluation of two types of waveguide DCs: rib waveguide and strip waveguide. As for the design the DC which splits an incident wave at a wavelength of 810 nm into two waves with equal power, 3D beam propagation method simulations were performed. The DCs with different coupled waveguide lengths were fabricated by RIE using Ni hard masks. After a SiO2 cladding layer deposition, the devices were diced and end facets were polished. The splitting characteristics of the rib waveguide DCs were evaluated using a DFB laser, and almost 1:1 splitting ratio was successfully obtained. Measured data shows that we can control the splitting ratio by changing coupled waveguide length. In addition to the above results on rib waveguide DC, we will report on the fabrication and evaluation of the strip waveguide DCs.

Conference Presentation

Citation Download Citation

Junya Miwa, Masafumi Kihira, Keishi Shiomi, Yasufumi Fujiwara, Masahiro Uemukai, and Ryuji Katayama "GaN waveguide directional coupler for optical quantum information processing systems (Conference Presentation)", Proc. SPIE 10918, Gallium Nitride Materials and Devices XIV, 109180J (13 March 2019); https://doi.org/10.1117/12.2510634

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KEYWORDS

Waveguides

Directional couplers

Quantum information processing

Gallium nitride

Quantum optics

Light sources

Semiconductors

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