SINGLE-SPAN FIBRE-OPTIC COMMUNICATION LINE Russian patent published in 2025 - IPC H04B10/291 H01S3/94 

FIELD: communication technique.

SUBSTANCE: invention relates to telecommunication equipment, particularly to single-span fibre-optic communication lines (FOCL). Said technical result is achieved due to that single span FOCL includes limited by transmitter 1 and receiver 2 optical fibre 3 (OF), divided into sections 4 and 5 by built-in optically stabilized fibre amplifier 6 made in form of ring resonator containing pair of spectral-selective splitters 7 and 8, first input of first of which 7 is connected to first section 4 of OF 3 of communication line, first output of second 8 is connected to second section 5 of OF 3 of communication line, between the output of the first and the input of the second spectral-selective splitters 7 and 8, respectively, a piece of erbium fibre 9 is built-in, and second input of first 7 and second output of second 8 spectral-selective splitters are optically connected in series by integrated insulator 10 and variable attenuator 11, wherein line on side of receiver 2 includes remote optical pumping source 12, between the first output of the second spectral-selective splitter 8 and second section 5 of OF 3 of the communication line, optical filter 13 for aligning the gain spectrum is installed, ring resonator in the section between the first spectral-selective splitter 7 second input and insulator 10 and at the gain spectrum optical filter 13 output is equipped with optically connected spectral-selective splitters 14 and 15, respectively, which divert part of the optical radiation of the annular resonator to second section 5 of OF 3 of the communication line in the associated direction, remote optical pumping source 12 is provided with its own remote optical pumping OF 16 with an ending in the form of a spectrally selective splitter 17 built into the ring resonator between the output of the first and the second spectrally selective splitters 7 and 8, respectively, and pumping means 18 power control device with generation power meter in annular resonator 19, at the output of second section 5 in front of receiver 2 in OF 3 of the communication line there is spectral-selective splitter 20 which leads said part of the optical radiation of the annular resonator to the input of a device for measuring power of generation in annular resonator 19.

EFFECT: reduced power consumption and increased service life of pumping device.

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