Fabrication of Polarization-Maintaining Photonic Crystal Fiber Coupler with Air Hole State Control Using CO2 Laser Irradiation Technique

Hirohisa YOKOTA  Yusuke ITO  Hiroki KAWASHIRI  Hideyuki KIUE  Hideo TOBITA  Yoh IMAI  Yutaka SASAKI  

IEICE TRANSACTIONS on Electronics   Vol.E95-C    No.10    pp.1689-1691
Publication Date: 2012/10/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E95.C.1689
Print ISSN: 0916-8516
Type of Manuscript: BRIEF PAPER
Category: Optoelectronics
photonic crystal fiber,  polarization-maintaining fiber,  optical fiber coupler,  polarization dependent coupling characteristics,  CO2 laser irradiation technique,  

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Polarization-maintaining photonic crystal fiber couplers (PM-PCFCs) were fabricated using a CO2 laser irradiation technique. We could control the states of air holes in the tapered region of couplers by adjusting the laser power density in the fusion and the elongation processes. It was demonstrated that the air hole remaining PM-PCFC exhibited polarization-splitting characteristics and that the air hole collapsed PM-PCFC had polarization insensitive coupling characteristics.