Nguyen Hoang HAI, Yoshinori NAMIHIRA^*, Shubi KAIJAGE, Feroza BEGUM, S. M. Abdur RAZZAK, and Kazua MIYAGI

Graduate School of Engineering and Science, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903-0213, Japan

(Received July 14, 2008; Accepted February 12, 2009)

This paper proposes and demonstrates a novel type of silica index guiding holey fibers (IGHFs) that has two cladding layers at the defective innermost structures. The proposed IGHFs exhibit remarkable chromatic dispersion properties such as nearly-zero and flattened dispersion over a wide spectral range and single mode guidance along with very low confinement loss. The numerical results indicate that 5 air-hole rings of nearly zero ultra-flattened dispersion single mode IGHFs can be designed with desire flattened dispersion of over a 340 nm bandwidth including the entire band of interest with low confinement loss of less than 10^-6 dB/m.

Key words: fiber characterization, flattened chromatic dispersion, confinement loss

^*E-mail address: namihira@eee.u-ryukyu.ac.jp