The invention instantiates a Personal VLAN bridge, using IEEE Std. The maximum refractive index of the core is greater than each of maximum refractive indexes of a first cladding coat, a second cladding coat, and a third cladding coat. This number is looked up in a table. A regulator is provided in the form of pressure-activated nozzles to regulate flow through the second phase outlets. Then, an MR resistance estimate during the polishing step is calculated from the S value and the K value. The method also includes capturing the scrambled secret authentication data with a communications device, and conducting an authentication transaction with the captured authentication data.