SINGLE-FIBER OPTICAL DUPLEX COMMUNICATION LINE Russian patent published in 1998 - IPC

FIELD: radio engineering and communications; fiber-optic transmission systems. SUBSTANCE: newly introduced in single-fiber duplex communication line are first and second modulating-signal shapers, first and second phase modulators, first and second low-frequency filters, oscillator, first, second, third, and fourth phase detectors, controlled oscillator, first, second, third, and fourth band-pass filters, controlled phase shifter, first, second, third, fourth, fifth, and sixth phase shifters, first and second frequency doublers, first, second, third, and fourth regenerative amplifiers, first and second output-signal shapers, first and second limiting amplifiers. EFFECT: extended length of single-fiber optical duplex communication line due to suppression of back dissipation noise. 3 dwg