A method for integrating an Optical Service Channel with a Quantum Key Distribution channel across a DWDM network having a single mode optical fiber is provided. A plurality of nozzles is positioned on the substrate to be in fluid communication with respective nozzle chambers. Furthermore, drilling defects on account of the offset of holes andor cores can be avoided. The manipulation may comprise an addition of a frequency component to the signal or an adaptation of an amplitude of a frequency component of the signal. A method for wireless communications is also disclosed.