International Scientific-Practical Conference Problems of Infocommunications Science and Technology
Criteria for Evaluation of Characteristics of Photon Switchboards Optical Signals and Optical Fibres for the Quantum Systems of Transfer Confidential Information
Further development of optical communication is connected with creation of completely optical photon networks in which processes of switching, transfers, reception and processing of signals occurs at purely photon level. Photon switchboards with optical management, optical amplifiers with remote optical food, generators of optical impulses with the set parameters and a number of passive optical elements are developed for realization of this task. In article on the basis of theoretical and pilot studies the system of parameters for assessment of characteristics of photon switchboards of optical signals and optical fibers for the quantum systems of transfer of confidential information allowing to optimize process of development of the next generations of photon switchboards of optical communication networks is defined. The photon switchboard allowing to reduce quantity of mechanical elements and knots with an irregular geometrical shape and a configuration, to raise the accuracy of process of photon switching, to reduce lag effect due to lack of mechanical side plays between knots and to increase operational reliability is developed because optical fibers aren't exposed to deformation, i.e., are in a motionless state.
Further development of optical communication is connected with creation of completely optical photon networks in which processes of switching, transfers, reception and processing of signals occurs at purely photon level. Photon switchboards with optical management, optical amplifiers with remote optical food, generators of optical impulses with the set parameters and a number of passive optical elements are developed for realization of this task. In article on the basis of theoretical and pilot studies the system of parameters for assessment of characteristics of photon switchboards of optical signals and optical fibers for the quantum systems of transfer of confidential information allowing to optimize process of development of the next generations of photon switchboards of optical communication networks is defined. The photon switchboard allowing to reduce quantity of mechanical elements and knots with an irregular geometrical shape and a configuration, to raise the accuracy of process of photon switching, to reduce lag effect due to lack of mechanical side plays between knots and to increase operational reliability is developed because optical fibers aren't exposed to deformation, i.e., are in a motionless state.
The analysis of the performance indicators fiber-optic communication lines (FOCL) using quantum technology based on the architectural concept of NGN (Next Generation Network) and future networks FN (Future Networks) for the construction highly efficient optical telecommunication networks supporting a wide range cryptographic resistance. Threats of unauthorized access, denial of service, loss information, cryptographic methods and algorithms for information protection are considered. Complex criteria of FOCL efficiency using such quantum technologies as network performance using WDM (Wavelength Division Multiplexing) technology, information security characteristics when using quantum cryptography protocols, taking into account resistance to various threats, informative characteristics photon sources are selected. A new approach is proposed for the study and assessment of complex indicators complex optical information protection systems and effective control of a set quantum key distribution systems for fiber-optic communication lines. The functioning of the investigated FOCL using quantum technology based on the principles "Point-to-point" network topology, which allows organizing a quantum information and service channel, is considered. On the basis of the proposed approach, the efficiency quantum key distribution, the capabilities quantum cryptography protocols under the influence of photon number splitting attack (PNS-Photon Number Splitting Attack) and the information entropy of the characteristics of sources of optical photon qubit fluxes are investigated. Analytical expressions are obtained for assessing the complex indicators of the information security system when using quantum key distribution (QKD) for FOCL. On the basis of the new approach, a numerical analysis was carried out and a graphical dependence of the information entropy of the packet on the packet length in qubits was constructed for the given transfer characteristics of the FOCL. It was found that an increase in the limited packet length in bits, which meets the requirements reliability and efficiency of the operation FOCL system, leads to an increase in the value information entropy as a fraction of the packet, at a given bit rate of the network.
Every year increases the amount of confidential information that is transmitted in optical communication networks. To ensure safe transmission of confidential information fiber optic lines are the most suitable. It is determined that the electromagnetic field of the light wave does not go beyond the optical fiber. However, under certain circumstances, interception of optical signal on the bend of the fibers is entirely possible. Thus, for the creation of optical lines with high level of information security are necessary additional measures. To this aim, in the proposed use of masking optical linear code by increasing the numbers of units are used passive components such as optical delay lines and optical splitters. The method allow increasing the number of units of code combinations to be transferred, and thus make it impossible for an adequate interpretation of the information. The advantage of the method is that the protection device is completely passive, and therefore reliable, and can be connected directly to the input and output of optical linear tract. Moreover, these devices do not require adjustment.
The system for transmission and reception of confidential information over fiber-optic communication line on the basis of created single-quantum registration system of optical radiation has 43 been suggested. With regard to such a communication system two types of optical wavelengths have been experimentally justified. One type of optical wavelength is used for information transfer and the second one for time synchronization of information transmission and reception, as well as for detection of unauthorized access to information, created with optical fiber macrobends. Optimal values of optical power, which allowed to provide the highest confidential information data rate and detect more effectively possible data loss channels have been established.
When transferring data over optical fiber communication channels, it is required to provide data security and the authenticity of their source. To limit the access to the data for a third party, there can be applied quantum-cryptographical systems which are supposed to transfer every data bit by means of low power optical signals containing radiation photons the number of which could be in the range from 10 to 1, however, are far from being perfect and suffer from shortcomings, the main of which being a large number of errors due to the depolarization effect of optical radiation. The aim of this work was, therefore, to create device for sending and receiving confidential data which could provide complete security of transferred data, inherent to quantum-cryptographical communication systems at the same time could have a low number of such errors. A device for quantum-cryptographic communication system with a photon counter applied as a receiving module has been proposed. The possibility to use silicon avalanche photodetectors operating in the photon counting mode for confidential information transmission systems and defining authenticity of the source of transmitted information has been shown. I develop modern optical fiber communication system incorporating avalanche photodetector photon counter as a receiving module, that allow to detect unauthorized access to information and violation of its integrity and speed up the exchange of information in comparison with well-known quantum-cryptographical communication systems.
The existing methods of information delivery to the strategic and tactical management of many government agencies are expensive, not always reliable and efficient. Therefore, quantum cryptographic systems (QCS) have been actively developed in recent years. However, there are problems with the use of the QCS associated with the reliability of information transfer. First, the existing fiber-optic communication channels (FOCC) are not designed to transmit single-photon signals, which leads to the complexity of their cryptographic protection. The second is insufficiently methodically developed calculation of energy losses and errors in the evaluation of the characteristics of information transfer in FOCC QCS. In article the analysis of the energy loss factors in the classical fiber-optic channel is carried out and the additive loss formula is discussed in detail. Then we consider the fiber-optic channel of quantum information transmission with the use of integrated optical devices. The additive formula of optical losses in such a channel is discussed. The features of losses in integrated optical devices are shown. The features of quantum cryptographic system of information transmission are considered. As a result, the model of FOCC QCS taking into account energy losses is presented, which allows competently in theoretical terms and visualize the passage of information through modern quantum cryptographically secure telecommunications while providing control in government structures.
In today’s digital era, the need for communication systems that are both faster and more secure continues to grow, pushing innovation toward the development of the Quantum Internet. This paper investigates how advancements in optical switching and networking technologies are shaping this evolution by combining classical optical communication with the principles of quantum mechanics. It begins by reviewing how optical fiber systems have advanced to support high speed, low loss data transmission, forming the backbone for quantum communication infrastructure. The study explains the working principles of qubits, entanglement, and Quantum Key Distribution (QKD), which allow the transfer of data with unparalleled security through photon based signaling. Furthermore, it explores modern optical switching methods such as all optical, electro optic, and MEMS based switches, emphasizing their role in managing quantum signals efficiently while reducing energy consumption and transmission latency. The paper also highlights key network components like quantum routers, repeaters, and photonic integrated circuits that enable seamless interaction between classical and quantum networks. In addition, it reviews emerging technologies such as AI-assisted routing, low noise photon detectors, and nanophotonic materials that enhance the scalability and performance of quantum systems. The research identifies persistent challenges, including photon loss, decoherence, fabrication cost, and standardization issues, while outlining strategies to overcome them through advanced design and material innovation. Overall, this work provides a comprehensive understanding of how optical switching advancements are paving the way for a reliable, large scale, and globally connected Quantum Internet capable of transforming future communication and information security.