Authentication Subsystem Integrated Optical Module Simulation Method

To authenticate Layer 2 switches, the authentication code transmitted by the sender of the information to the recipient using the authentication module built into the switch can be used. To generate the authentication code, a pulse signal is used, the energy of which is equal to the energy of the photon. The path for transmitting and receiving the authentication code contains an optical radiation control device based on an integrated optical interferometer. In one of the interferometer arms, a spiral delay line is introduced, which design allows the use of the BB84 protocol to generate an authentication code. A method for modeling an interferometer with a spiral delay line based on integrated optics has been developed. The method is based on a three-dimensional analysis of channel waveguides and has no restrictions on the bending radius and waveguide type. The method uses the division of the waveguide section region into finite elements, the replacement of the wave equation in cylindrical coordinates by a variational problem. When solving the matrix problem, information is obtained on the mode composition of the waveguide and the value of the electric field strength at the split nodes. Knowing the distribution of the strength over the cross-section of the waveguide, one can calculate the power of the mode and its losses. The developed method was used to calculate the permissible bending radius of the interferometer delay line for typical integrated-optical channel waveguides at a fixed value of energy losses.

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