We demonstrate a robust 3-dB directional coupler which has a narrow silicon wire core and a wide gap. Sensitivity to the gap variation is decreased to one tenth that of a conventional directional coupler. Better spectral stability due to the enhanced robustness to waveguide geometrical fluctuations was experimentally verified.
© 2014 Optical Society of AmericaFull Article | PDF Article
Joris Van Campenhout, William M. J. Green, Solomon Assefa, and Yurii A. Vlasov
Opt. Express 17(26) 24020-24029 (2009)
Yuya Shoji, Kenji Kintaka, Satoshi Suda, Hitoshi Kawashima, Toshifumi Hasama, and Hiroshi Ishikawa
Opt. Express 18(9) 9071-9075 (2010)
Keijiro Suzuki, Ken Tanizawa, Takashi Matsukawa, Guangwei Cong, Sang-Hun Kim, Satoshi Suda, Morifumi Ohno, Tadashi Chiba, Hirofumi Tadokoro, Masashi Yanagihara, Yasushi Igarashi, Meishoku Masahara, Shu Namiki, and Hitoshi Kawashima
Opt. Express 22(4) 3887-3894 (2014)