FIELD: optics.
SUBSTANCE: invention relates to optical engineering, specifically to photonic quantum communication devices. Disclosed invention is intended for spectral filtering of the fundamental optical mode from spurious optical modes of a distributed feedback laser (DFB laser) and, accordingly, increasing the spurious mode suppression coefficient. Distributed feedback laser spurious mode suppression device comprising a fibre three-port circulator, the first port of which is connected to the output of the distributed feedback laser, wherein the second port of the circulator is connected to the input of a high-quality fibre optical filter comprising a fibre Bragg grating (FBG), a control and power board, the output of the optical filter is connected to the photodetector, and the third port of the circulator is connected to the optical output of the device.
EFFECT: suppression of DFB laser spurious modes.
1 cl, 1 dwg
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