11 October 2013 Temperature insensitive refractive index sensor based on concatenated long period fiber gratings
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Proceedings Volume 8915, Photonics North 2013; 89151K (2013) https://doi.org/10.1117/12.2037751
Event: Photonics North 2013, 2013, Ottawa, Canada
We propose and demonstrate a temperature immune biosensor based on two concatenated LPGs incorporating a suitable inter-grating-space (IGS). Compensating the thermal induced phase changes in the grating region by use of an appropriate length of the IGS the temperature insensitivity has been achieved. Using standard telecommunication grade single-mode fibers we show that a length ratio of ~8.2 is sufficient to realize the proposed temperature insensitivity. The resulting sensor shows a refractive index sensitivity of 423.28 nm/RIU displaying the capability of detecting an index variation of 2.36 × 10-6 RIU in the bio-samples. The sensor can also be applied as a temperature insensitive WMD channel isolation filter in the optical communication systems, removing the necessity of any external thermal insulation packaging.
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Saurabh Mani Tripathi, Saurabh Mani Tripathi, Wojtek J. Bock, Wojtek J. Bock, Predrag Mikulic, Predrag Mikulic, "Temperature insensitive refractive index sensor based on concatenated long period fiber gratings", Proc. SPIE 8915, Photonics North 2013, 89151K (11 October 2013); doi: 10.1117/12.2037751; https://doi.org/10.1117/12.2037751

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