Patent ID: 8717561

Claim:
A miniature spectrometer, comprising: an input unit that receives a first optical signal, that enters into the miniature spectrometer within a predefined angle, and a second optical signal, that enters into the miniature spectrometer outside the predefined angle; a stray light filtering structure that filters out the second optical signal, the stray light filtering structure comprising: a first filter section having a first dentate structure; and a second filter section having a second dentate structure disposed opposite to the first dentate structure, wherein the first dentate structure and the second dentate structure are configured to: form an optical channel through which the first optical signal passes, and filter out the second optical signal entering into the first or the second dentate structure; and a miniature diffraction grating that receives the first optical signal passed by the stray light filtering structure and separates the first optical signal into a plurality of spectral components.