To provide a spectroscopic system capable of generating a state (light-blocked state) where light with any wavelengths within a wavelength variable range is not transmitted by the spectroscopic system.SOLUTION: A spectroscopic system includes: a spectroscopic part 46 for selectively transmitting light with wavelengths corresponding to any peaks among a plurality of peaks of transmittance in a wavelength variable range； and a bandpass part 44 for blocking light with wavelengths in a first range including a part of the plurality of peaks in the wavelength variable range, so as to transmit light with wavelengths in a second range including the other peaks in the wavelength variable range.SELECTED DRAWING: Figure 2【課題】波長可変範囲内の何れの波長の光も分光システムを透過しない状態（遮光状態）を生成することが可能な分光システムを提供する。【解決手段】波長可変範囲内における透過率の複数のピークのうち何れかのピークに対応する波長の光を選択的に透過させる分光部４６と、波長可変範囲のうち複数のピークの一部を含む第１範囲の波長の光を遮光し、波長可変範囲のうち他のピークを含む第２範囲の波長の光を透過させる帯域通過部４４とを具備する。【選択図】図２
