When your fiber-based sensor system is made for a grand scale, the optical and mechanical characteristics of the FBG array must be maintained over a very long length, up to multiple kilometers of fiber that could include multiple dozens of gratings. Over the years, we have been able to adapt our robust FBG writing process to array manufacturing, controlling with precision the position of each FBG over the length of a fiber spool, minimizing or even removing the need for splices.
In terms of optical characteristics, both very low or very high reflectivity values are possible, with a wide range of central wavelengths and bandwidths available, to match the spectral shape you need. Each FBG can be extremely if necessary, or individually custom specified at different wavelengths.
We can work with standard, bend-insensitive or high-temperature acrylate and polyimide coated fibers, with 125um or 80um diameters, recoating them right after the FBG writing step for optimal process stability and reliability. If necessary, non-recoated FBGs are also available. The single mode fibers we use will be compatible with different type of interrogator systems for measurement and analysis.
All these features mean that ITF’s FBG arrays for sensors are ideal when in use in real-life applications. The data acquired by an optical interrogator will be accurate, repeatable and trustworthy over the full length of the fiber spool when deployed.
Examples of FBG array applications: