This is a near-infrared fiber spectrometer with a symmetrical CT optical path and a compact design. It has a configurable spectral range, a numerical aperture of 0.11, a high resolution of 0.3 nm, and a low stray light of about 0.5%. It uses backlit and cooled (-25 ℃) InGaAs detectors, which can cover spectral ranges of 950 nm-1700 nm, 950 nm-2200 nm, or 950 nm-2500 nm depending on the choice. It offers good stability and reproducibility of spectral response and is suitable for laser and near-infrared measurements. It is a high-performance fiber spectrometer for scientific research.