Analysis of noise temperature of optical waveguide

Optical waveguides employed in Earth satellites communications systems are used instead of antenna waveguide transmission line to increase the noise quality of the receiving systems at Earth point. The special features of operation of an optical waveguide, the noise temperature of the optical waveguide elements with vertical orientation of the directional pattern, and the noise temperature of the optical waveguide are considered. Use of an open optical waveguide assures operation with a wider frequency band and increases the noise temperature. It is found that in a number of practical instances it is possible, together with the employment of shielded optical waveguides, to use optical waveguides of the open type. It is the noise temperature of such a system is computed by the method presented.