Patent ID: 6992817

Claim:
A double pass optical amplifier with unidirectional compensation of chromatic dispersion and obstruction of backscattering, comprising a circulator for receiving an input optical signal and outputting an amplified optical signal, an amplification stage including a pumping laser and a multiplexer for receiving the input optical signal from the circulator and an output from the pumping laser, and an Erbium-doped fiber connected to the output of the multiplexer and in which the optical signal undergoes an initial amplification while passing through the Erbium-doped fiber on the way through the fiber and a second amplification on the way back, said optical amplifier having, after the amplification stage, at least one dispersion compensating fiber whose input and output are connected to the Erbium-doped fiber, and at least one device arranged in the circuit to prevent backscattering generated in the dispersion compensating fiber from returning to the Erbium-doped fiber, and to allow the optical signal to travel through the dispersion compensating fiber only once and in one direction, and then return to the amplifier circuit for the second amplification.