An integrated spectral micro-module with a linear variable filter and an InGaAs focal plane array was proposed. As the core light dispersing element, the linear variable filter was coupled with an InGaAs detector array. Compared with the grating spectrometer, the micro-module has compact structure and stable optical properties. The wavelength calibration method and its accuracy were proposed and validated experimentally. The spectral range of the module is from about 900 nm to 1 700 nm. The calibration accuracy is better than 1.3 nm and the spectral resolution is no larger than 1.25% of peak wavelength. Experimental results demonstrate that the method of wavelength calibration is feasible and accurate. The spectral micro-module can be widely used in field or on-line applications.