Abstract: The present disclosure provides a method for stacking a plurality of optical fibre ribbons in an optical fibre cable. The method includes a step of arranging a plurality of optical fibre ribbon stacks in a hexagonal arrangement in the optical fibre cable. The method may further include stacking the plurality of optical fibre ribbons to form an optical fibre ribbon stack such that the optical fibre ribbon stack may have a parallelogram shape. Each optical fibre ribbon is placed at an offset from adjacent optical fibre ribbon. The optical fibre ribbon stack may have a stack height. In addition, each optical fibre ribbon of the plurality of optical fibre ribbons may have a ribbon height. The hexagonal arrangement may have the packaging density greater than 80%.

Abstract: Surface wave filter with a slab-shaped substrate of monocrystalline piezoelectric material, particularly lithium niobate, having input and output transducers optionally coupled by means of a coupler on one substrate side. A plastic and/or elastic damping layer are applied for suppressing reflected waves. The damping layer covers at least in some regions, this substrate side except for the area which is bounded by the transducers, the coupler, the ends of the conductor runs and the regions between the transducers and the coupler. The end face edge of the damping layer increases at least in sections, gradually from zero to the value of the layer thickness.

Abstract: A surface wave filter with a wafer-shaped substrate formed of monocrystalline piezoelectric material having a surface, input and output transducers disposed on the surface of the substrate, a coupler for coupling the transducers being spaced apart from the transducers on the surface of the substrate defining zones therebetween, and electric conductor runs being connected to the transducers on the surface of the substrate and having ends, includes a damping layer formed of photoresist material with a plastic base covering substantially the entire surface of the substrate except for a region bounded by the transducers, the coupler, the ends of the electric conductor runs and the zones between the transducers and the coupler, and a method for manufacturing the filter.

Abstract: Surface wave filter with a slab-shaped substrate of monocrystalline piezoelectric material, particularly lithium niobate, having input and output transducers optionally coupled by means of a coupler on one substrate side. A plastic and/or elastic damping layer are applied for suppressing reflected waves. The damping layer covers, at least in some regions, this substrate side except for the area which is bounded by the transducers, the coupler, the ends of the conductor runs and the reions between the transducers and the coupler. The end face edge of the damping layer increases at least in sections, gradually from zero to the value of the layer thickness.