The book "Fiber-optical devices of technological purpose", compiled under the editorship of Shandarov V. M. with the participation of the authors Shcheglov A. In. , Ganula E. In. and Minaeva O. In. , is a unique work that immerses the reader in the world of modern fiber optics technologies. This publication will become an indispensable assistant for students, graduate students, engineers and anyone interested in advanced developments in the field of optical technologies. The book explores key aspects of the design, manufacture, and application of fiber optic devices that find wide application in a variety of industries, including communications, medicine, industry, and scientific research. The authors share their experience and knowledge, providing readers with a deep understanding of the principles of operation of optical systems and their components. They describe not only theoretical foundations, but also practical aspects, which makes the material available to both beginners and experienced professionals. One of the main topics raised in the book is the impact of fiber-optic technologies on the development of modern communication systems. The authors analyze in detail how the fibers provide high data transmission speed and reliability of communication, which is especially important in conditions of rapid growth of information flows. Readers will be able to learn about the latest advances in optical communication, such as multiplexing, transmission systems using different wavelengths, and other innovative methods that change the perception of communications. The book also touches on important aspects relating to the use of fiber optic devices in medicine. The authors describe how these technologies are used in diagnosis and treatment, for example, in endoscopy and laser surgery. This makes the publication especially interesting for medical professionals and medical students seeking to expand their knowledge of modern methods of diagnosis and treatment. The style of the authors is clear and accessible, which makes it easy to perceive even the most complex topics. They use many examples and illustrations, which makes the material not only informative, but also visually attractive. This is especially important for those who prefer to learn through practical examples and visual materials. The book "Fiber-optical devices for technological purposes" will be of interest not only to specialists in the field of optics, but also to everyone who wants to be aware of the latest trends in technology. It is suitable for both students of technical universities and professionals working in related fields, such as electronics, telecommunications and information technology. If you are looking for a source of knowledge about fiber-optic technologies that combines theory and practice, then this publication will be a real find for you. It will help you not only deepen your knowledge, but also inspire new ideas and projects. The book can also be useful for researchers working on projects related to optical systems, and for teachers who want to enrich their courses with relevant materials. Thus, “Fiber-optical devices for technological purposes” is not just a textbook, but a whole world of knowledge that opens doors to the future of technology. Do not miss the opportunity to get acquainted with this unique work, which will certainly take a worthy place on the shelf of everyone who is interested in fiber optics and its application in the modern world.