Title

Interferometer Based On Strongly Coupled Multi-Core Optical Fiber For Accurate Vibration Sensing

Abstract

We report on the use of a simple interferometer built with strongly-coupled core optical fiber for accurate vibration sensing. Our multi-core fiber (MCF) is designed to mode match a standard single-mode optical fiber (SMF). The interferometer consists of a low insertion loss SMF-MCF-SMF structure where only two super-modes interfere. The polymer coating of the MCF was structured and the interferometer was sandwiched between a flat piece and a V-groove. In this manner our device is highly sensitive to force with sensitivity reaching −4225 pm/N. To make the MCF interferometer sensitive to vibrations the flat piece was allowed to move, thus, its periodic movements exert cyclic localized pressure on the MCF which makes the interference pattern to shift periodically. Our sensors can be used to monitor vibrations in a broad frequency range with the advantage that the measurements are unaffected by temperature changes.

Publication Date

10-16-2017

Publication Title

Optics Express

Volume

25

Issue

21

Number of Pages

25734-25740

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/OE.25.025734

Socpus ID

85031330184 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85031330184

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