Abstract
We report on numerical and experimental studies showing the influence of arc curvature on the confinement loss in hypocycloid-core Kagome hollow-core photonic crystal fiber. The results prove that with such a design the optical performances are strongly driven by the contour negative curvature of the core-cladding interface. They show that the increase in arc curvature results in a strong decrease in both the confinement loss and the optical power overlap between the core mode and the silica core-surround, including a modal content approaching true single-mode guidance. Fibers with enhanced negative curvature were then fabricated with a record loss-level of 17 dB/km at 1064 nm.
Highlights
Hollow-core photonic crystal fiber (HC-PCF) consists of an optical-guiding central air-core surrounded by an arrangement of micro-scaled silica tubes running along its length [1]
The first HC-PCF family guides via photonic bandgap (PBG), and holds the potential for guiding light with attenuation several orders of magnitude lower than the fundamental limit of ~0.16 dB/km in conventional optical fibers, and which is set by the Rayleigh scattering in silica
The second type of HC-PCF is distinguished by its broadband optical guidance and the relatively higher transmission loss-levels compared to the PBG guiding HC-PCF
Summary
Hollow-core photonic crystal fiber (HC-PCF) consists of an optical-guiding central air-core surrounded by an arrangement of micro-scaled silica tubes running along its length [1]. The second type of HC-PCF is distinguished by its broadband optical guidance and the relatively higher transmission loss-levels compared to the PBG guiding HC-PCF This HCPCF family guides via inhibited coupling (IC) between the cladding modes and the guided core modes. In 2010, we have proposed a new route in enhancing IC in Kagome HC-PCF and demonstrated a dramatic reduction of loss [11] This consists of core-shaping the HC-PCF to a hypocycloid-like contour (i.e. with negative curvature) [11, 12] so as to minimize the spatial overlap between the high “azimuthal-like” number modes that reside in the silica coresurround and the zero-order Bessel-profiled core modes [13]. We present the fabrication of fiber exhibiting the largest arc curvature and a record loss level of 17 dB/km at 1064 nm
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
