Compact assembly-free vector bend sensor based on all-in-fiber-core Mach-Zehnder interferometer

Pengcheng Chen, Xuewen Shu, Kate Sugden

Research output: Contribution to journalArticlepeer-review


A novel low-cost, compact, assembly-free and sensitive optical fiber curvature sensor is presented. This device consists of an off-axis positive refractive index modified zone (PRIMZ), induced by direct femtosecond laser, written in single mode fiber (SMF) core. The PRIMZ transforms the original SMF section into a few-mode fiber (FMF). As a result, the whole fiber forms an assembly-free “SMF-FMF-SMF” sandwich Mach-Zehnder interferometer. When the device is bent, a direction dependent spectral shift of the interference pattern is produced. The sensitivity of the sensor is up to 2.53 and 2.24nm/m-1 for the 0° and 180° orientations in a wide bend range (from 0-4m-1). In addition, the device is immune to surrounding refractive index and has low temperature crosstalk, which make it very attractive for practical structural monitoring applications.
Original languageEnglish
Pages (from-to)531-534
JournalOptics Letters
Issue number3
Early online date3 Jan 2018
Publication statusPublished - 29 Jan 2018

Bibliographical note

© 2018, Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.

Funding: National Natural Science Foundation of China (NSFC) (61775074); National 1000 Young Talents Program, China; 111 Project (No. B07038); Natural Science Foundation of Guangdong Province, China (2015A030313633).


  • All-optical devices;
  • Optical sensing and sensors;
  • Optical design and fabrication;
  • Optical devices;
  • Interferometry


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