S. M. Abdur RAZZAK, Yoshinori NAMIHIRA, Feroza BEGUM, Kazuya MIYAGI, Shubi KAIJAGE, Nguyen Hoang HAI, Tatsuya KINJO, and Nianyu ZOU

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

(Received January 19, 2007; Accepted May 9, 2007)

This paper presents dispersion-flattened modified hexagonal photonic crystal fibers (MH-PCFs) with extremely low confinement loss. The finite difference method (FDM) with an anisotropic perfectly matched boundary layer (PML) is used to investigate the chromatic dispersion and confinement properties. It is demonstrated that it is possible to obtain an ultra-flattened dispersion of 0± 0.41 ps/(nm•km) in the wavelength range of 1.35–1.65 μm and an extremely low confinement loss of less than 10^-4 dB/km from a four-ring MH-PCF. Effective single-mode operation of the MH-PCF is confirmed for the entire band of interest.

Key words: photonic crystal fiber, chromatic dispersion, confinement loss, effective area