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Title: Design and analysis of a refractive index sensor based on dual-core large-mode-area fiber
Authors: Kamakshi K.
Rastogi, Vipul K.
Kumar A.
Published in: Optical Fiber Technology
Abstract: We present a novel co-axial dual core large-mode-area (LMA) fiber design for refractive index sensing. In a dual-core fiber there is resonant coupling between the two cores, which is strongly affected by the refractive index (RI) of the outermost region. The transmittance of the fiber, therefore, varies sharply with the refractive index of surrounding medium. This characteristic of the proposed structure has been utilized to design a RI sensor. We have analyzed the structure by using the transfer matrix method. Our numerical results show that the proposed sensor is highly sensitive with the resolution of 2.0 × 10-6 around nex = 1.44376. Effect of design parameters on sensitivity of the proposed sensor has also been investigated. © 2013 Elsevier Inc. All rights reserved.
Citation: Optical Fiber Technology (2013), 19(4): 325-329
Issue Date: 2013
Publisher: Academic Press Inc.
Keywords: Dual-core fiber
Large-mode-area fiber
Leakage loss
Refractive index sensor
Resonant coupling
ISSN: 10685200
Author Scopus IDs: 36086156800
Author Affiliations: Kamakshi, K., Department of Physics, Indian Institute of Technology Roorkee, Roorkee, India
Rastogi, V., Department of Physics, Indian Institute of Technology Roorkee, Roorkee, India
Kumar, A., Department of Applied Physics, Delhi Technological University, New Delhi, India
Funding Details: One of the authors (K. Kamakshi) acknowledges the financial support provided by Indian Institute of Technology, Roorkee, Ministry of Human Resources and Development (MHRD) Government of India. This work has been partially supported by the UK–India Education and Research Initiative (UKIERI) major award on “Application specific microstructured optical fibers”. We also acknowledge help of our student Seema in carrying out some of the calculations.
Corresponding Author: Kamakshi, K.; Department of Physics, Indian Institute of Technology Roorkee, Roorkee, India; email:
Appears in Collections:Journal Publications [PH]

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