Interference element for multichannel optical waveguide - is used for filtering, dividing, switching or modulating transmitted signal and is designed for low losses

摘要

The element has an outer contour which is tapered to form integral input and output junctions matched in diameter to that of the respective optical waveguide (1,2,3). These junctions have an outer contour which is free from sharp points in all longitudinal cross-sectional planes. Pref. the element deflects waves of a given wavelength along a perpendicular path to a further waveguide (2) and it uses a periodic grating (4) as a Bragg deflector, with the grating structure at 45 degrees to the wave path. The structure has a period which is half the wavelength of the required waves, or a whole multiple.