Formation of moiré grating in core of germanosilicate fibre by transverse holographic double exposure method

Abstract

The first demonstration of the feasibility of writing a moire grating into a germanosilicate fibre using double exposure by ultraviolet fringe patterns is reported. Using this technique a resonant filter response with a bandwidth of 0.2 nm centred around 1200nm and with a finesse of 6 has been obtained.