We proposed a novel photonic crystal fiber composed of a double-cladding square lattice that could be used in dual-band, Er and Tm optical gain bands, simultaneously supporting a large negative dispersion and a high birefringence. We theoretically investigated the light guiding property through the proposed photonic crystal fiber by using a vectorial finite-element method with a perfectly matched layer. By optimizing the structural parameters, we obtained an ultra-large negative dispersion of-20,186 ps/(nm·km) and a very high birefringence of 9.27 × 10-3 at the wavelength of 1.55 μm in the Er gain band and a very large negative dispersion of-8,067 ps/(nm·km) and a high birefringence of 1.0 × 10-3 at the wavelength of 1.87 μm in the Tm band. We further discussed the roles of waveguide parameters on the chromatic dispersion, its slope, and the birefringence of the fiber as well as the mode field diameter. The proposed fiber could be directly applied for dual-band dispersion and polarization control in fiber laser cavities as well as optical communications and sensors in the dual bands.
Bibliographical noteFunding Information:
Manuscript received September 18, 2018; revised December 20, 2018; accepted January 6, 2019. Date of publication January 9, 2019; date of current version February 22, 2019. This work was supported in part by the National Research Foundation of Korea under Grant 2015R1D1A1A01058057 funded by the Korean Government and in part by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (No. 2016k1A3A1A09918616). (Corresponding authors: Soeun Kim; Kyunghwan Oh.) Y. S. Lee and K. Oh are with the Department of Physics, Yonsei University, Seoul 03722, South Korea (e-mail:,firstname.lastname@example.org; email@example.com).
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics