V. A. Malakhov – Dr.Sc. (Eng.), Professor of Department of Physics and Technology of Optical Communication, Nizhny Novgorod State Technical University n.a. R.E. Alekseev

E-mail: physics@nntu.ru

E. V. Pavlovich – Head of 1203 VP of RF DoD, FSUE FRPC “Measuring System Research Institute n.a. Yu.Ye. Sedakov”

A. A. Raevskaya – Post-graduate Student, Department of Physics and Technology of Optical Communication, Nizhny Novgorod State Technical University n.a. R.E. Alekseev; Engineer, FSUE FRPC “Measuring System Research Institute n.a. Yu.Ye. Sedakov”

It is shown by example of periodically irregular guiding structures how incompleteness of the system of the boundary conditions of the boundary problems to be solved in the open form, results in the loss of some of their decisions, that is, to the incompleteness of the wave spectrum.

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