Koji Choki
41 Papers
386 Citations
Koji Choki is an academic researcher. The author has contributed to research in topics: Waveguide (optics) & Cladding (fiber optics). The author has an hindex of 10, co-authored 41 publications.
Chat about Author
Papers
Patent
Optical waveguide film, laminated type optical waveguide film, optical waveguide, optical waveguide assembly, optical wiring line, optical/electrical combination substrate and electronic device
Shinsuke Terada,Koji Choki +1 more
- 16 Jun 2009
TL;DR: In this article, it was shown that the size of the gap between the adjoining core portions varies along the X-direction in at least a part of the optical waveguide area.
151
Polymer Optical Waveguides With GI and W-Shaped Cores for High-Bandwidth-Density On-Board Interconnects
TL;DR: In this article, a polynorbornene-based graded-index (GI) core polymer optical waveguides using the photoaddressing method is presented, which is capable of realizing high-bandwidth-density on-board optical interconnects.
47
Patent
Electronic apparatus, cellular phone, flexible cable and method for manufacturing optical waveguide forming body
Mutsuhiro Matsuyama,Koji Choki,Tetsuya Mori,Kei Watanabe +3 more
- 09 Jun 2009
TL;DR: In this paper, an air layer is provided in a deforming section which experiences bending deformation as a result of the movement of a second body relative to a first body (either a pivoting or sliding movement), and the position of this air layer becomes located on the outer circumferential side of a core.
31
Optical and electrical hybrid flexible printed circuit boards with unique photo-defined polymer waveguide layers
Tetsuya Mori,Keizo Takahama,Makoto Fujiwara,Kei Watanabe,Hiroshi Owari,Yoji Shirato,Shinsuke Terada,Mariko Sakamoto,Koji Choki +8 more
- 11 Feb 2010
TL;DR: In this article, photo-defined waveguides are made by simple pattering process, known as "Photo-addressing", and only ultraviolet irradiation through a photo mask over photosensitive dry film is carried out to form entire rainbow waveguide patterns, and any additional steps like etching or developing are not required.
28
Low-loss design and fabrication of multimode polymer optical waveguide circuit with crossings for high-density optical PCB
Takaaki Ishigure,Keishiro Shitanda,Takuya Kudo,Shotaro Takayama,Tetsuya Mori,Kimio Moriya,Koji Choki +6 more
- 28 May 2013
TL;DR: In this article, the authors theoretically and experimentally demonstrate that 90 % lower optical loss is realized with multimode crossed polymer optical waveguides by introducing graded-index (GI) cores, compared to conventional step-index core counterparts.
22