Intensity Curvature Sensor based on Photonic Crystal Fiber with Three Coupled Cores

• Type: Article in International Conference Proceedings Book
• Date: 2012

Authors

martins, h (Author) Other; marques, mb (Author) FCUP; jorge, p (Author) FCUP; cordeiro, cmb (Author) Other; frazao, o (Author) Other

Conference proceedings International

Title: MICRO-STRUCTURED AND SPECIALTY OPTICAL FIBRES

Conference on Microstructured and Specialty Optical Fibres

Brussels, BELGIUM, APR 17-19, 2012

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Other information

Authenticus ID: P-002-GD8

DOI: 10.1117/12.922784

Abstract (EN): An intensity curvature sensor using a Photonic Crystal Fiber (PCF) with three coupled cores is proposed. The three cores were aligned and there was an air hole between each two consecutive cores. The fiber had a low air filling fraction, which means that the cores remain coupled in the wavelength region studied. Due to this coupling interference is obtained in the fiber output even if just a single core is illuminated. A configuration using transmission interrogation, which used a section fiber with 0.08 m of PCF as the sensing head, and a configuration using reflection interrogation, which used a section fiber with 0.13 m of PCF as the sensing head, were characterized and compared for curvature sensing. When the fiber is bended along the plane of the cores, one of the lateral cores will be stretched and the other compressed. This changes the coupling between the three cores, changing the optical power intensity. The sensibility of the sensing head was strongly dependent on the direction of bending, having its maximum when the bending direction was along the plane of the cores. A maximum curvature sensitivity of 1.8 dB. m was demonstrated between 0 m and 2.8 m.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8