FIELD: physics, optics.
SUBSTANCE: invention relates to optics and can be used as a fibre-optic filter. The device comprises first and a second light guide output nodes having first and second optical fibres, as well as first and second optical filter elements. The first optical filter element is placed between first ports of the first and second optical fibres. The first optical filter element is inclined at an angle to the optical axis of the first optical fibre. A light component of a first wavelength range is transmitted from the first port to the second port of the second optical fibre through the first optical filter element. A light component of a second wavelength range from the first port is reflected by the first optical filter element. The second optical filter element is placed such that reflected light is returned to the first optical fibre through the first port after reflection thereof by the second optical filter element and re-reflection by the first optical filter element.
EFFECT: wider reflecting spectrum and high reflection insulation.
30 cl, 13 dwg
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