[OPTICAL REVIEW Vol. 18, No. 6 (2011) 436-440]
© 2011 The Japan Society of Applied Physics
Design of Highly Nonlinear Octagonal Photonic Crystal Fiber with Near-Zero Flattened Dispersion at 1.31 μm Waveband
Yoshinori NAMIHIRA, Jingjing LIU1, Taito KOGA, Feroza BEGUM, Md. Anwar HOSSAIN, Nianyu ZOU1, Shubi F. KAIJAGE, Yuki HIRAKO, Hiroki HIGA, and Md. Asraful ISLAM2
Graduate School of Engineering and Science, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan
1Research Institute of Photonics, Dalian Polytechnic University, Ganjingzi District, Dalian 116034, China
2Sub Divisional Engineer, Public works, PWD, Bangladesh Government Service, Bangladesh
(Received June 5, 2011; Accepted September 14, 2011)
This paper presents a highly nonlinear octagonal photonic crystal fiber (HN-OPCF) with a Ge-doped core for dental optical coherence tomography (OCT) applications. The simulation results show that a nonlinear coefficient of 56.3 W-1 km-1 and the flattened dispersion of less than -1.0 ps/(nmċkm) are obtained in 75 nm waveband (1265–1340 nm). Owing to its high nonlinear coefficient and flattened dispersion, the HN-OPCF is expected to be suitable for supercontinuum generation, which is very important in OCT applications. The numerical simulation results demonstrate that the proposed HN-OPCF can generate wideband supercontinuum.
Key words: photonic crystal fiber (PCF), optical coherence tomography (OCT), finite difference method (FDM), nonlinear coefficient, effective area (Aeff), chromatic dispersion (D), supercontinuum (SC), effective index (neff)