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The ability to integrate a multiplicity of distinct functional elements into a single device structure enables the realization of systems with higher-level functionality. Here we report on the design and fabrication of a fiber device structure which contains integrated optical, electrical and thermal elements for self monitored optical transport. The fibers comprise an optical transmission element which is a hollow-core multilayer cylindrical photonic bandgap (PBG) structure designed to guide high power radiation at 10.6 microns along the fiber axis. Multiple thermal-detection elements are placed in the vicinity of the hollow core for the purpose of temperature monitoring along the entire fiber length. Metal wires bridged by a semiconductor layer extend along the length of the fiber and deliver an electrical response to the fiber ends upon change in the fiber temperature. The multimaterial fiber, which contains a polymer insulator, a binary large bandgap semiconductor, a quaternary narrow bandgap semiconductor, and metallic elements, is drawn at high speeds from a single fiber preform to produce extended lengths of optically and thermally functional fibers. The exponential dependence on temperature of the electrical conductivity of the semiconducting material allows for th