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Open AccessArticle

A Method to Process Hollow-Core Anti-Resonant Fibers into Fiber Filters

School of Electrical and Electronic Engineering, The Photonics Institute, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
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Fibers 2018, 6(4), 89; https://doi.org/10.3390/fib6040089
Received: 25 July 2018 / Revised: 10 August 2018 / Accepted: 15 August 2018 / Published: 22 November 2018
(This article belongs to the Special Issue Hollow core optical fibers)
Hollow-Core Anti-Resonant Fiber (HC-ARF) shows promising applications. Nevertheless, there has been a persistent problem when it comes to all-fiber integration due to a lack of HC-ARF-based fiber components. In response to this remaining challenge, we investigate a reliable, versatile and efficient method to convert an HC-ARF into a fiber filter. By locally heating an HC-ARF with a CO2 laser, the fiber structure becomes deformed, and cladding capillaries shrink to produce a thicker wall. This process is analogous to “writing” a new fiber with a thicker wall on the original fiber, resulting in creating new high loss regions in the original transmission bands. Thus, the construction of a fiber filter is realized by “writing” a new fiber on the original fiber. The feasibility of this method is confirmed through experiments, adopting both one- and two-layer HC-ARF. The HC-ARF-based fiber filters are found to have transmission spectra consistent with simulation prediction. Both band pass and band reject fiber filters with more than a 20-dB extinction ratio are obtainable without extra loss. Thus, an in-fiber HC-ARF filter is demonstrated by the CO2 writing process. Its versatile approach promises controlled band selection and would find interesting applications to be discussed. View Full-Text
Keywords: fiber filters; hollow core fibers; anti-resonant; photonic crystal fibers; fabrication fiber filters; hollow core fibers; anti-resonant; photonic crystal fibers; fabrication
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Huang, X.; Yong, K.-T.; Yoo, S. A Method to Process Hollow-Core Anti-Resonant Fibers into Fiber Filters. Fibers 2018, 6, 89.

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