The focus of this paper is the development of a suitable thermoelectric cooling solution (TECs) for fiber-coupled laser diodes of an optical power supply by thermal simulation via PSpice or LTSpice. As a first step it was necessary to create a working model of the thermal circuit of the TEC. As a consequence it was possible to simulate an existing cooling system and to evaluate the accuracy of the model with real measurement data. The obtained results as well as the gained knowledge of the thermal design lead to the development of a new construction of a double stage cooling system using TECs.
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