Abstract

power of optical radiation in fiber-optic transmission systems has now been completed at the All-Russia Research Institute of Optophysical Measurements (VNIIOFI) [1‐5]. The operation of these systems is based on the method of substitution of the average power of optical radiation affecting a standard transducer the unit of which is reproduced by the average power of a constant electric current. The process consists of preliminary electrical calibration of the transducer, subsequent transmission of radiation to the transducer, and the determination of the average power with the use of the value of the conversion factor of the electric current obtained in the course of calibration as well as the coefficient of equivalence of substitution determined in the course of certification of a standard calorimetric system. This, in general outline, is how the algorithm used for reproduction of the unit of average power of optical radiation in the new reference systems may be represented. In the course of developing high-precision reference systems, it has become necessary to find and select the most efficient circuits and designs of instruments incorporated into the circuits by means of which the required reproduction precision may be attained. As a result, high-precision standard calorimetric transducers of the average power of optical radiation in fiber-optic transmission systems and calibration systems that include highly stable sources of constant electric current have been created. The most precise multimeters for measurements of this current and voltage in the course of calibration, nanovoltmeters for measurements of the output signals of the transducers, meteoscopes (weather forecast software) for monitoring the parameters of the environment and introducing particular corrections into the results of measurements have also been selected. In addition, considerable emphasis has been devoted to the search for and selection of optimal designs of the optical circuits of the newly created reference systems. Besides stabilized sources of radiation, these systems also include fiber-optical cables that transmit radiation, light shutters, radiation flux dividers in standard and control channels, instruments for measurement of the average radiation power in control channels, and a number of other elements.

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