2024-03-28T20:51:50Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/61282022-11-17T02:08:08Zhdl_2115_20053hdl_2115_145The impact of elliptical deformations for optimizing the performance of dual-core fluorine-doped photonic crystal fiber couplersVarshney, Shailendra K.Florous, Nikolaos J.1000020333627Saitoh, Kunimasa斉藤, 晋聖1000040101521Koshiba, Masanoriopen access© 2006 Optical Society of America, Inc.459In this paper we study the impact of elliptically-deformed features such as cladding air-holes and elliptically-modulated cores, as ingredients for optimizing the coupling characteristics of dual-core fluorine-doped photonic crystal fiber (PCF) couplers. We provide a detailed numerical investigation by using a trial and error approach for optimizing the propagation characteristics of fluorine-doped PCF couplers. Typical characteristics of the newly proposed PCF coupler structure are: wavelength-flattened coupling characteristics between 0.7 μm and 1.6 μm wavelength range, coupling efficiency of 50±1 % from 0.9 μm to 1.6 μm, and a reasonably small coupling length of 1.3 cm. In addition we have elaborately derived the design parameters so that our proposed dual-core PCF coupler exhibits polarization-insensitive characteristics verified by using a full-vectorial beam propagation method. The proposed dual-core PCF can be effectively used as a 3-dB coupler, over a wide wavelength range.Optical Society of America2006-03-06engjournal articleAMhttp://hdl.handle.net/2115/61281094-4087Optics Express14519821995https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/6128/1/OE14-5.pdfapplication/pdf1.1 MB2006-03-06