OPTICAL FILTER Russian patent published in 2013 - IPC G02F1/225 

FIELD: physics.

SUBSTANCE: optical filter has channel optical waveguides for input/output of optical radiation and propagation of a light beam, light beam splitters arranged in series on the radiation path and a forming means for transmitting optical radiation branched by the beam splitters. The forming means is in form of a set of connecting channel optical waveguides and/or a planar optical waveguide. The beam splitters are in form of a set of connected optical waveguides, the mutual arrangement of which is based on maintaining, at operating radiation wavelength, a phase difference which is essentially a multiple of 2π for most beams branched by different beam splitters and transmitted from the input to the output of the optical filter.

EFFECT: providing a wide adjustment range and a narrow filtration line width.

23 cl, 10 dwg