apparatus and method for free space coherent optical communications with automatic compensation of phase noise in atmosphere using the optical comb of femtosecond lasers

摘要

The present invention relates to an apparatus and method for interference free communication through automatic compensation of phase noise in the atmosphere using an optical comb of a femtosecond laser. More particularly, And a free space through automatic compensation of phase noise in the atmosphere using a femtosecond laser beam combiner that compensates the phase noise due to atmospheric disturbance in advance by the transmitting end by obtaining the transmission light by pre- To an interference optical communication apparatus and method. The free space interference communication apparatus includes a first light source unit, a second light source unit, a modulation unit, a compensation unit, a light transmitting unit, and a light receiving unit, which are automatically compensated for the phase noise in the air using an optical comb of a femtosecond laser according to an embodiment of the present invention. . The first light source unit outputs a first laser light for measuring the atmospheric disturbance of the free space, and the second light source unit outputs a second laser light for transmitting data. The modulator modulates the second laser light by a predetermined modulation method to generate modulated light. The modulating light and the first laser light are input to the compensator, and the superposed light, in which the modulated light and the first laser light are superimposed, Distortion to generate transmission light. Finally, the optical transmission unit transmits the transmission light to the receiver via the free space, and the optical reception unit receives the reflected light reflected by the receiver. Here, the compensation unit further receives the first laser light and the reflected light, compares the reflected light with the reference light to measure the atmospheric disturbance of the free space, and predistort the superimposed light based on the measured atmospheric disturbance.