[OPTICAL REVIEW Vol. 17, No. 2 (2010) 66-73]
© 2010 The Japan Society of Applied Physics

Polarization-Maintaining Photonic Crystal Fibers with Near-Zero Flattened Dispersion in 1.06 μm Waveband for Medical Applications

Tatsuya KINJO, Yoshinori NAMIHIRA, Kazuya ARAKAKI, Shubi F. KAIJAGE, S. M. Abdur RAZZAK, Feroza BEGUM, Hiroki HIGA, Shinya NOZAKI1, and Nianyu ZOU2

Graduate School of Engineering and Science, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903-0213, Japan
1Transdisciplinary Research Organization for Subtropical and Island Studies University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903-0213, Japan
2Research Institute of Photonics, Dalian Polytechnic University, No. 1 Qinggongyuan, Ganjingzi Dist, Dalian 116034, China

(Received July 27, 2009; Accepted January 12, 2010)

In this paper we present the design of a modified hexagonal photonic crystal fiber (PCF) having high birefringence and a near-zero flattened dispersion. Using the finite-difference method (FDM), it is shown that the proposed multiple Ge-doped core hexagonal PCF exhibits a high birefringence of order 10-3 and a nearly zero flattened dispersion in the optical coherence tomography (OCT) waveband. In addition, the proposed PCF has a confinement loss of less than 10-8 dB/m at 1.06 μm. PCFs with such properties are considered suitable for both endoscopic OCT and other experimental setups employing 1.06 μm lasers.

Key words: photonic crystal fiber (PCF), birefringence (B), dispersion (D), confinement loss (LC), optical coherence tomography (OCT), finite difference method (FDM)