Hydrogen loader for fiber bragg grating manufacturing

Purpose and goal

Through studies, simulations and laboratory experiments we wanted to test our hypothesis that a new product, the hydrogen sensitizer, can contribute to our goal making a plug and play system for FBG manufacturing. We also wanted to examine the processes, by scanning the parameters of the sensitizer, but also by investigating the impact of other process steps. Our goal was achieved by demonstrating a feasible process based on local sensitization of an optical fiber e.g. overnight.

Expected results and effects

The work gave us a broader understanding of the physical processes that are important for achieving the customers´ FBG specs in shortest possible time. For example, we showed that the effect of heat from the stripping process can accelerate sensitizing. This is an important result not only for realization of the plug and play concept but are also an important feature for today´s users of the hot air burst stripper. Experimental setup showed that development of a chamber with gas-tight fiber feedthroughs requires more extensive design work, which is currently under way.

Planned approach and implementation

Northlab had discussions with FBG manufacturers with previous experience from the hot air burst stripper process, in order to gain insight into the impact on the FBG performance. Basic simulations at Acreo constituted important basis for the selection of the parameter space. Tests with sensitization and FBG production was carried out in cooperation between Northlab, Acreo and Hittech. Experimental setup and pressure tests demonstrated a critical point regarding a quick access chamber with gas-tight fiber feedthroughs at 100-150 bar.