[OPTICAL REVIEW Vol. 14, No. 3 (2007) 120-124]
© 2007 The Optical Society of Japan

Highly Nonlinear Dispersion-Flattened Square Photonic Crystal Fibers with Low Confinement Losses

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

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

(Received November 22, 2006; Accepted March 15, 2007)

A new simple structure of an index-guiding highly nonlinear dispersion-flattened square photonic crystal fiber (HNDF-SPCF) with low confinement losses is proposed. The results reveal that it is possible to design five-rings HNDF-SPCFs with a flattened dispersion of 0.43 ps/(nm·km), low dispersion slope of −0.02 ps/(nm2·km), low confinement loss of approximately 10−3 dB/m, and a large nonlinear coefficient of approximately 35 W−1 km−1 at 1.55 μm. It is also observed that the confinement loss is less than 10−1 dB/m in the wavelength range of 1.2–1.7 μm.

Key words: fiber characterization, nonlinear coefficient, chromatic dispersion, confinement loss