Improvement of contrast ratio in quadriphase-shift-keying optical label recognition with passive optical waveguide circuit

Hiroki Kishikawa, Yoshihiro Makimoto, Kensuke Inoshita, Sanae Igarashi, Nobuo Goto, Shin-ichiro Yanagiya
  • Optical Engineering, May 2016, SPIE
  • DOI: 10.1117/1.oe.55.5.057104

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http://dx.doi.org/10.1117/1.oe.55.5.057104