Optical fiber spectrometer usually uses optical fiber as a signal coupling device to couple the measured light into the spectrometer for spectral analysis. Raman spectrometer is mainly suitable for optical research in scientific research institutes, physical and chemical laboratories of colleges and universities, biology and medicine, as well as the determination and confirmation of substance components. It can also be used for drug detection and gem identification in criminal investigation and jewelry industry. Personally, I think Raman spectrometer is designed on the basis of optical fiber spectrometer, using the Raman scattering effect of optical fiber.