Zobrazeno 1 - 10
of 810
pro vyhledávání: '"Tetsuya Kawanishi"'
Publikováno v:
IEEE Access, Vol 12, Pp 56414-56421 (2024)
We reported a thermal investigation on a photodetector (PD) with a sandwiched structure comprising p-type, intrinsic, and n-type (PIN-PD) layers based on Williams’ thermal model. Simulations and measurements of the photocurrent in the linear region
Externí odkaz:
https://doaj.org/article/4517d33883504aa293c974c352af74b0
Publikováno v:
IEEE Access, Vol 12, Pp 22813-22820 (2024)
In this study, we proposed a novel design for fabricating a unitraveling carrier–type photodetector using In0.52Al0.48As as the collector material. The proposed InAlAs photodetector is based on the structure of a conventional unitraveling carrier
Externí odkaz:
https://doaj.org/article/e85dfa1e0ed44028a69126f6f89cdeb8
Autor:
Asif Bilal, Abdul Quddious, Atsushi Kanno, Tetsuya Kawanishi, Stavros Iezekiel, Marco A. Antoniades
Publikováno v:
IET Microwaves, Antennas & Propagation, Vol 18, Iss 1, Pp 43-51 (2024)
Abstract A reconfigurable inductorless negative‐refractive‐index transmission‐line (NRI‐TL) metamaterial phase shifter for sub‐6 GHz 5G antenna applications is proposed. The design consists of a microstrip transmission line loaded both in s
Externí odkaz:
https://doaj.org/article/cb897b1e77b24b348950c7bf99a41d89
Publikováno v:
IEEE Access, Vol 11, Pp 65590-65598 (2023)
The importance of multi-valued data transmission for improving communication throughput has become apparent with the explosive growth o communication and computing demands. Although modulation schemes with denser constellations can provide increased
Externí odkaz:
https://doaj.org/article/27370d122b5048cf816514c4c35daa79
Autor:
Qingchuan Huang, Tetsuya Kawanishi
Publikováno v:
Photonics, Vol 10, Iss 3, p 324 (2023)
A novel radio frequency (RF) phase measurement method that uses optical modulation was proposed. The mathematical model of Mach–Zehnder modulator (MZM) characterization was reviewed. By measuring the output sideband power of the optical modulator,
Externí odkaz:
https://doaj.org/article/5cfa1a36bc594eeca77ad5e08f9ef849
Autor:
Ukrit Mankong, Pakawat Chamsuk, Sitthichok Nakprasert, Sangdaun Potha, Zu-Kai Weng, Pham Tien Dat, Atsushi Kanno, Tetsuya Kawanishi
Publikováno v:
Sensors, Vol 23, Iss 5, p 2532 (2023)
Millimeter wave fixed wireless systems in future backhaul and access network applications can be affected by weather conditions. The losses caused by rain attenuation and antenna misalignment due to wind-induced vibrations have greater impacts on the
Externí odkaz:
https://doaj.org/article/f0828b19d0024f94b17fa1024b4358f8
Autor:
Zu-Kai Weng, Atsushi Kanno, Pham Tien Dat, Keizo Inagaki, Kosuke Tanabe, Eisaku Sasaki, Thomas Kurner, Bo Kum Jung, Tetsuya Kawanishi
Publikováno v:
IEEE Access, Vol 9, Pp 163476-163491 (2021)
To develop highly reliable fixed wireless links, such as mobile backhaul and fronthaul systems, it is essential to evaluate the link budget under extreme weather conditions. In this paper, we presented a link budget evaluation for fixed wireless link
Externí odkaz:
https://doaj.org/article/7934f36642cf44cb9c00174319bdd2be
Autor:
Tetsuya Kawanishi
Publikováno v:
Photonics, Vol 8, Iss 5, p 160 (2021)
Optoelectronic devices which play important roles in high-speed optical fiber networks can offer effective measurement methods for optoelectronic devices including optical modulators and photodetectors. Precise optical signal modulation is required f
Externí odkaz:
https://doaj.org/article/47d821c7f8444ef2bc8919908da43abb
Autor:
Benjamin J. Puttnam, Ruben S. Luís, José Manuel Delgado Mendinueta, Jun Sakaguchi, Werner Klaus, Yukiyoshi Kamio, Moriya Nakamura, Naoya Wada, Yoshinari Awaji, Atsushi Kanno, Tetsuya Kawanishi, Tetsuya Miyazaki
Publikováno v:
Photonics, Vol 1, Iss 2, Pp 110-130 (2014)
We review work on self-homodyne detection (SHD) for optical communication systems. SHD uses a transmitted pilot-tone (PT), originating from the transmitter laser, to exploit phase noise cancellation at a coherent receiver and to enable transmitter li
Externí odkaz:
https://doaj.org/article/a279606d087342e68b61f1ca9ceda611
Publikováno v:
Applied Sciences, Vol 9, Iss 3, p 554 (2019)
This paper reviews linear cell radar systems, which are radar systems consisting of many antenna units connected by radio-over-fiber to monitor linear-shaped areas. A linear cell system using a millimeter-wave band can provide high-resolution imaging
Externí odkaz:
https://doaj.org/article/05eaf18152dc47289c984099f6dafd2d