AI Article Synopsis
- The study introduces a new measurement technique that utilizes a double-clad fiber coupler (DCFC) and a fiber Bragg grating (FBG) to detect cladding modes in optical fibers.
- The device effectively measures both the optical spectra and power in cladding modes, achieving high sensitivity for surrounding refractive index (SRI) measurements with a range of 1.30 to 1.45 RIU.
- This innovative measurement scheme can be modified for various applications, including the detection of bend, temperature, and other parameters via evanescent wave sensors.
Article Abstract
We present a novel measurement scheme using a double-clad fiber coupler (DCFC) and a fiber Bragg grating (FBG) to resolve cladding modes. Direct measurement of the optical spectra and power in the cladding modes is obtained through the use of a specially designed DCFC spliced to a highly reflective FBG written into slightly etched standard photosensitive single mode fiber to match the inner cladding diameter of the DCFC. The DCFC is made by tapering and fusing two double-clad fibers (DCF) together. The device is capable of capturing backward propagating low and high order cladding modes simply and efficiently. Also, we demonstrate the capability of such a device to measure the surrounding refractive index (SRI) with an extremely high sensitivity of 69.769 ± 0.035 μW/RIU and a resolution of 1.433 × 10(-5) ± 8 × 10(-9) RIU between 1.37 and 1.45 RIU. The device provides a large SRI operating range from 1.30 to 1.45 RIU with sufficient discrimination for all individual captured cladding modes. The proposed scheme can be adapted to many different types of bend, temperature, refractive index and other evanescent wave based sensors.
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| http://dx.doi.org/10.1364/OE.21.006873 | DOI Listing |
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