Abstract
The present invention discloses a Fabry-Perot optical filter device which includes an input terminal for introducing light into the Fabry-Perot optical filter device, a Fabry-Perot device for allowing the light to pass through and be filtered, a plurality of reflectors individually used to reflect the passed light back to the Fabry-Perot device in order to filter the light at least twice, and an output terminal for leading out the light after it has been finally filtered.