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      Supermode Bragg grating combined Mach-Zehnder interferometer for temperature-strain discrimination.

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          Abstract

          We report on a compact sensor by integrating a Mach-Zehnder interference and a cladding Bragg grating in a same section of all-solid photonic bandgap fiber. Theoretical investigation reveals that the Bragg grating resonance stems from the coupling of counter-propagating cladding LP01-like supermodes and the Mach-Zehnder interference works between a LP01-like supermode and LP01 core mode. Compared with the interference fringe, such supermode grating dip responses to axial strain in a more sensitive and opposite-direction manner. Whereas, the interference fringe shows a higher temperature sensitivity than the supermode grating dip. By means of these different responses, this device finds a useful application in the discrimination of temperature and axial strain.

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          Author and article information

          Journal
          Opt Express
          Optics express
          The Optical Society
          1094-4087
          1094-4087
          Dec 28 2015
          : 23
          : 26
          Article
          333655
          10.1364/OE.23.033001
          26831968
          a3a764b2-cd8f-40a9-8711-1635bc564f63
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