A novel hollow-core tapered coupler has been theoretically designed and fabricated by fiber drawing machine. The coupler's inner wall is coated with a polycrystalline GeO2 film. The coupling loss of hollow-core tapered coupler is about 0.2 dB. Hollow-core tapered coupler reduces the transmission loss of hollow-core optical fiber (HCOF) by 0.5 dB/m, therefore the coupler is suitable for coupling high power CO2 laser in industrial application.
© 2005 Chinese Optics Letters
(080.0080) Geometric optics : Geometric optics
Guiyao Zhou, Zhiyun Hou, Lantian Hou, and Jigang Liu, "Hollow-core tapered coupler for large inner diameter hollow-core optical fibers," Chin. Opt. Lett. 1, 15-17 (2003)