Combined photonic crystal fibres for control of the radiation spectrum

The authors report the controlled way of transmission spectrum of the hollow-core microstructured fibre. Our approach is based on combination of two fibers with insignificant differences of geometrical parameters of the clad. The way is realized with fibers from a glass LFG (Tehnolux) made by method “stack and drawn”. It is demonstrated, that the form and place photonic bandgap strongly depends on distinction of clad structure parameters in a range of micrometer unit.