Responses to temperature and thermal gradients of non-identical cascaded LPGs taking into account dispersion

In this paper we present a detailed theoretical and experimental study of the responses of non-uniform cascades of LPGs (C-LPG) to thermal gradients which cause changes in the depth of the interference minima. Simulations have been performed for cascades without and with dispersion of identical and non-identical effective refractive index differences. It has been shown that in case of non-identical LPGs the response to temperature differences …