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Fibers 2018, 6(4), 89;

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
Author to whom correspondence should be addressed.
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)
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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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