BANDWIDTH-TUNABLE OPTICAL FILTER

摘要

The present invention relates to a bandwidth-tunable optical filter. The bandwidth-tunable optical filter comprises a first optical filter which changes a first wavelength band of a first output light transmitting or being reflected according to a first incident angle of a first incident light; a second optical filter which changes a second wavelength band of a second output light transmitting or being reflected according to a second incident angle of a second incident light, and is arranged on a propagation path of the first output light of the first optical filter and provides the first output light as the second incident light. A part or all of the first wavelength band of the first optical filter and the second wavelength band of the second output light of the second optical filter are overlapped, and a light of the overlapped wavelength band is outputted. The bandwidth-tunable optical filter can change a bandwidth of a transmitting light or a reflected light linearly by rotating the first optical filter and the second optical filter, and can change a center wavelength of the transmitting light or the reflected light according to an initial arrangement angle of the first optical filter and the second optical filter.