Abstract
Determining the dependence of phase difference modulations between light
pulses in a modified Mach-Zehnder interferometer was used to develop an
optical system coding the information and working as an eavesdropping
sensor for an optical fibre information exchange system. The basic
challenge in the system development is to maintain stable operation in
changing environmental conditions, as well as to ensure optimal parameters
of the phase modulator. The system was tested for various many-kilometer
long transmission lines of single-mode fibres. The research was focused on
achieving the normative Bit Error Rate for the system in the 100 Mbit/s
range (STM-1). Such a system can be used in commercial applications for
the code key secure transmission in the physical layer of the link.
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