We demonstrate a grating recording method using an excimer KrF UV laser for batch imprinting of distributed feedback (DFB) fiber lasers (FL) with complex profiles and high grating strength (up to K<4 cm-1) for underwater acoustic sensing applications. The specially developed FPGA-controlled stepping algorithm allows for the recording of long (up to 52mm) DFB laser structures with step error compensation, chirping and apodisation for the FL side-lobe suppression at arbitrarily high exposures. Batch recording involving simultaneous exposure of a number of fibers placed in the recording zone, to achieve time and cost reduction during manufacturing is demonstrated. A number of different gratings in a passive fiber as well as DFB FL in Er-doped active fiber have been fabricated and studied. Further ways to improve the recording process are proposed.
In this paper we demonstrate high strength (Κ< 4 cm-1) grating imprinting using excimer KrF UV laser for underwater DFB fiber laser sensing applications. The FPGA-controlled stepping recording system allows for the recording of long (up to 52mm) gratings with error compensation, chirping and apodisation for side-lobe suppression and at arbitrarily high exposures. Batch recording of fibre gratings (4 fibres/mm) was also proposed and demonstrated.
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