Patent ID: 6816643
Filing Date: 2004-11-09
Classification: G02B,H04J

Abstract:
A wavelength tunable demultiplexing filter device which demultiplexes arbitrary wavelength components from wavelength-multiplexed light, comprising:an optical filter element including a plurality of filter chips arranged thereon, each of said filter chips transmits a predetermined single wavelength component of the wavelength-multiplexed light; a light emitting unit which emits the wavelength-multiplexed light into said optical filter element from a specific direction; a first light receiving unit which is located on the same optical axis as said light emitting unit and receives the light transmitted through said optical filter element; a moving unit which moves said optical filter element in a direction that said filter chips are arranged so that the light from said light emitting unit enters another filter chip; and a controller which controls said moving unit in accordance with a wavelength component to be demultiplexed.