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Method of optical reflectometry (MOR), as one of the most effective photometric methods, is the powerful tool for creation of optical fiber structures monitoring systems (Barnoski & Jensen, 1976). The present stage of reflectometric systems development is directed on the further improvement of their characteristics, research of new principles of probing and registration of backscattering information, development of precision measuring converters and is based on use of systems with continuous wave radiation. Such accent is explained, firstly, by power equivalence of pulse probing with high peak power and small duration of a pulse and continuous probing with low power of radiation and big time of supervision, secondly, by the fulfilled technique of spatially resolved measurements based on the linear frequency modulation method, and thirdly, by the significant progress in the field of creation of hi-tech and inexpensive element base (sources of radiation with the big coherence length, broadband devices of radiation parameters control and high-speed photoreception devices).

Synthesis of Two-Frequency Symmetrical Radiation and Its Application in Fiber Optical Structures Monitoring