Hisato Uetsuka
National Institute of Advanced Industrial Science and Technology
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Publication
Featured researches published by Hisato Uetsuka.
Advanced Photonics for Communications (2014), paper PW2B.2 | 2014
Hisato Uetsuka; Masao Tachikura; Hitoshi Kawashima; Keisuke Sorimoto; Hiroyuki Tsuda; Keiichi Sasaki; Yuta Yamashita
A 5x5 wavelength cross-connect switch (WXC) with densely integrated MEMS mirrors is proposed and demonstrated. It has a 100GHz channel spacing compatible with the ITU-grid, a low loss (8-10dB) and a low PDL (~0.5dB).
Optics Express | 2013
Keisuke Sorimoto; Ken Tanizawa; Hisato Uetsuka; Hitoshi Kawashima; Masahiko Mori; Toshifumi Hasama; Hiroshi Ishikawa; Hiroyuki Tsuda
A novel liquid crystal on silicon (LCOS)-based wavelength selective switch (WSS) is proposed, fabricated, and demonstrated. It employs a multilayered arrayed waveguide grating (AWG) as a wavelength multiplex/demultiplexer. The LCOS deflects spectrally decomposed beams channel by channel and switches them to desired waveguide layers of the multilayered AWG. In order to obtain the multilayered AWG with high yield, phase errors of the AWG is externally compensated for by an additional phase modulation with the LCOS. This additional phase modulation is applied to the equivalent image of the facet of the AWG, which is projected by a relay lens. In our previously-reported WSS configuration, somewhat large footprint and increased cost were the drawbacks, since two LCOSs were required: one LCOS was driven for the inter-port switching operation, and the other was for the phase-error compensation. In the newly proposed configuration, on the other hand, both switching and compensation operations are performed using a single LCOS. This reduction of the component count is realized by introducing the folded configuration with a reflector. The volume of the WSS optics is 80 × 100 × 60 mm3, which is approximately 40% smaller than the previous configuration. The polarization-dependent loss and inter-channel crosstalk are less than 1.5 dB and -21.0 dB, respectively. An error-free transmission of 40-Gbit/s NRZ-OOK signal through the WSS is successfully demonstrated.
Proceedings of SPIE | 2015
Hisato Uetsuka; Masao Tachikura; Hitoshi Kawashima; Kazuhiko Ikeda; Keisuke Sorimoto; Hiroyuki Tsuda; Keiichi Sasaki; Yuto Yamashita
A wavelength cross-connect switch (WXC) is proposed and demonstrated. The cross-connect optics have orthogonal imaging systems that operate differently in the switching and spectral planes. The switching plane has 2f Fourier optics with a Rayleigh length. On the other hand, the spectral plane has 4f imaging optics. Two types of switching engines, microelectromechanical system (MEMS) mirrors and liquid crystal on silicon (LCOS), are applied for the same cross-connect optics. The 5×5 WXC with MEMS mirrors has a 100 GHz channel spacing, which is compatible with the International Telecommunication Union (ITU) grid. On the other hand, the WXC with LCOS has a variable channel spacing. The characteristics of two types of WXC are compared. In addition, the port count, which is one of the important parameters, is discussed.
Proceedings of SPIE | 2016
Koji Anju; Hiroyuki Tsuda; Hisato Uetsuka
Polarization gratings, which have the important properties of being highly efficient for first order diffraction and having high polarization sensitivity, can be applied to beam splitters, displays, spectro-polarimeters, and so on. Usually, polarization gratings are fabricated utilizing the periodic anisotropy of liquid crystal molecules. However, high tolerance to light, heat, and humidity is required, in particular, for optical communication applications. Therefore, a polarization grating based on an inorganic material is more suitable than one based on an organic one. We propose a silicon polarization grating with form birefringence induced by an anisotropic surface microstructure with features shorter than the wavelength of light (sub-wavelength anisotropic structure), allowing the birefringence to be controlled through selection of the dimensions of the periodic structure. In this paper, we describe the design of sub-wavelength structures of half wave plates using a thin film of silicon. By optimizing the line width, the line spacing, and the thickness of the film, a transmittance of more than 99% at an incident wavelength of 1550 nm was obtained. A polarization grating based on this half wave plate was designed. The orientation of the half wave plate structure was rotated in a particular direction. Furthermore, we evaluated the wavelength dependence and incident angle dependence of the diffraction efficiency using a finite-difference time-domain method.
Archive | 2008
Hiroshi Ishikawa; Toshifumi Hasama; Masahiko Mori; Hisato Uetsuka
Archive | 2013
Hiroshi Ishikawa; Toshifumi Hasama; Hitoshi Kawashima; Masahiko Mori; Hisato Uetsuka; Akihito Hongo; Hiroyuki Tsuda; Keisuke Sorimoto; Nazirul Afham bin Idris
Archive | 2011
Hiroshi Ishikawa; Toshifumi Hasama; Hitoshi Kawashima; Kenji Kintaka; Masahiko Mori; Hisato Uetsuka; Hiroyuki Tsuda; Keisuke Sorimoto
Archive | 2009
Hiroshi Ishikawa; Toshifumi Hasama; Hitoshi Kawashima; Kenji Kintaka; Masahiko Mori; Hisato Uetsuka; Hiroyuki Tsuda; Keisuke Sorimoto
microoptics conference | 2013
Keisuke Sorimoto; Hisato Uetsuka; Masao Tachikura; Hitoshi Kawashima; Masahiko Mori; Toshifumi Hasama; Hiroshi Ishikawa; Nazirul Afham Idris; Hiroyuki Tsuda
international conference on photonics in switching | 2016
Hisato Uetsuka; Shu Namiki; Keiichi Sasaki
Collaboration
Dive into the Hisato Uetsuka's collaboration.
National Institute of Advanced Industrial Science and Technology
View shared research outputsNational Institute of Advanced Industrial Science and Technology
View shared research outputsNational Institute of Advanced Industrial Science and Technology
View shared research outputsNational Institute of Advanced Industrial Science and Technology
View shared research outputsNational Institute of Advanced Industrial Science and Technology
View shared research outputsNational Institute of Advanced Industrial Science and Technology
View shared research outputsNational Institute of Advanced Industrial Science and Technology
View shared research outputs