Abstract: Fiber Bragg grating (FBG) demodulators are widely used in various fields, including civil engineering, aviation, healthcare, and national defense. To comply with the Calibration Specification for Optical Fiber Bragg Grating Sensor Network Analyzers (JJF 1804-2020), it is crucial to calibrate the wavelength demodulation values of the FBG demodulator using a stable reference standard FBG. In this study, we developed a set of high stability FBG wavelength reference standards by utilizing a specially designed stress relief structure, intelligent control algorithm, and semiconductor refrigeration technology to achieve high precision temperature control. Through repeatability testing and comparison to commercial FBG measurements, we demonstrate that the performance of our developed FBG wavelength standards far exceeds the requirements of the calibration specification. Our results show that our FBG demodulator calibration procedure significantly improves the calibration uncertainty of the instrument.