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Other recent progress includes the demonstration of birefringent photonic crystal fibers with zero polarimetric sensitivity to temperature,<ref>http://www.phosfos.eu/index.php/eng/Phosfos/Journals/Birefringent-photonic-crystal-fibers-with-zero-polarimetric-sensitivity-to-temperature</ref><ref>http://www.phosfos.eu/eng/Phosfos/Facts-Results</ref> and a successful demonstration of transversal load sensing with fibre Bragg gratings in microstructured optic fibers.<ref>http://www.phosfos.eu/index.php/eng/Phosfos/Journals/Transversal-Load-Sensing-with-Fiber-Bragg-Gratings-in-Microstructured-Optical-Fibers</ref>
The key areas where significant progress has been made are listed below
1. '''Silica [[Microstructured fiber]]s for temperature insensitive optical sensors''' - a new pressure sensitive and temperature insensitive optical fibre sensor has been developed. The sensor uses a [[fiber Bragg grating]] written into a [[microstructured fiber]]. The pressure sensitivity exceeds the state-of-the-art with a factor of 20, whilst the sensor is truly temperature insensitive. The sensor is based on a novel design of a highly birefringent (10<sup>−3</sup>) microstructured optical fibre sensor that is designed to have a high pressure sensitivity (3.3 pm/bar), whilst at the same time exhibit negligible temperature sensitivity (10<sup>−2</sup> pm/K). The fabrication method is compatible with conventional ultraviolet grating inscription setups for [[fiber Bragg grating]] manufacture. The temperature insensitivity was achieved by tailoring the design of the doped region in the core of the [[microstructured fiber]] via a series of design iterations.<ref>http://www.phosfos.eu/eng/Phosfos/Facts-Results/Fact-sheet-01-Silica-Microstructured-Optical-Fibre-Sensor</ref>
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