Anna Hirai Yuichi Matsumoto Takanori Sato Tadashi Kawai Akira Enokihara Shinya Nakajima Atsushi Kanno Naokatsu Yamamoto
IEICE Transactions on Electronics E105.C(8) 385-388 2022年8月 [査読有り]
A Mach-Zehnder optical modulator with the tunable multimode interference coupler was fabricated using Ti-diffused LiNbO3. The modulation extinction ratio could be voltage controlled to maximize up to 50 dB by tuning the coupler. Optical single-sid...
We propose a new design of an electro-optic full adder by using coupled Si microring resonators for highly dense integration. The device size is significantly reduced by using doubly coupled microring resonators as a power divider. A newly designe...
In the paper, improvement of the efficiency for the Rectenna (Rectifier + Antenna) is described. The rectifier circuit in this research promotes further improvement in efficiency and expansion of the power range by using the passive path switching...
Anna Hirai Yuichi Matsumoto Takanori Sato Tadashi Kawai Akira Enokihara Shinya Nakajima Naokatsu Yamamoto
Optics Communications 501 2021年12月 [査読有り]
We analyzed the optical properties of optical couplers based on multimode interference (MMI) in titanium-diffused LiNbO3 (Ti:LN) waveguides using the beam propagation method (BPM) with refractive index distributions by Ti diffusion. From these res...
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2021-August 2021年8月 [査読有り]
In this paper, a 180-degree rat-race hybrid which consists of short transmission lines less than quarter wavelength with shunt capacitors at both ends and an ideal phase inverter is described. We show the possibility of realizing a compact and wid...
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