The high-performance measuring device is an essential tool to test the transmission characteristics of fibers since the most significant optical parameter for the infrared fiber is the transmission loss of the optical energy. The optical characteristic testing system proposed in this letter includes two parts: ① a tunable CO_2 laser system with a good stability and high resolution. A special design for the laser configuration leads to its good mechanic and thermal stability. In order to improve the spectral resolution, a theoretical method of the spectral resolution is proposed through the theoretical and experimental research. Besides, we make a precise design for the wavelength tuning outfit that is controlled by a computer so that a tunable laser with 99 spectral lines in the bandwidth 9-11i m is obtained. ② the testing system for the transmission loss of fibers. The optical parameters of the infrared fibers are processed and analyzed by a computer and the final testing results are output from a printer.
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