Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.14279/18566
Title: All-in-Fiber Cladding Interferometric and Bragg Grating Components Made via Plane-by-Plane Femtosecond Laser Inscription
Authors: Theodosiou, Antreas 
Ioannou, Andreas 
Kalli, Kyriacos 
Major Field of Science: Engineering and Technology
Field Category: Electrical Engineering - Electronic Engineering - Information Engineering
Keywords: Cladding components;Femtosecond laser inscription;Fibre Bragg gratings;Fibre optics sensors;Microstructure fabrication;Optical design and fabrication
Issue Date: 15-Sep-2019
Source: Journal of Lightwave Technology, 2019, vol. 37, no. 18, pp. 4864-4871
Volume: 37
Issue: 18
Start page: 4864
End page: 4871
Journal: Journal of Lightwave Technology 
Abstract: We introduce a method of inscribing in-fiber devices using a femtosecond laser that is applicable to crucial components, such as cladding waveguides (CWGs), cladding Mach-Zehnder interferometers (MZIs), embedded waveguide Bragg gratings (WBGs), and waveguide Fabry-Perot cavities using the same key femtosecond laser parameters, via an 'inscribe and step,' plane-by-plane approach, applied as necessary on two orthogonal axes. This leads to femtosecond laser-inscribed cladding waveguides and ultra-compact MZIs that can support functional, integrated fiber Bragg gratings; the unique sensing characteristics of the filters are maintained and provide complementary measure and information. This ensures a single inscription process, offering reliability and repetition in component manufacture, as the basic conditions to inscribe the here-demonstrated elements are common. We characterize CWG-WBG devices for axial strain, bend, and response to refractive index. The MZI-WBG is exposed to temperature and humidity excursions, confirming that the unique sensor responses are maintained for this compact, compound sensor. The MZI exhibits response to external refractive index, a large, negative wavelength response with temperature and high sensitivity to humidity, whereas the MZI-located WBG displays a similar sensitivity to conventional core-based Bragg grating sensors to temperature and no response to relative humidity. We consider that this research is an important step in the development of compact, smart optical fiber sensors.
URI: https://hdl.handle.net/20.500.14279/18566
ISSN: 15582213
DOI: 10.1109/JLT.2019.2925263
Rights: © IEEE
Attribution-NonCommercial-NoDerivs 3.0 United States
Type: Article
Affiliation : Cyprus University of Technology 
Publication Type: Peer Reviewed
Appears in Collections:Άρθρα/Articles

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