Patent ID: 7269314

Claim:
A dispersion compensation device comprising: a first mode light conversion section capable of converting input light into light of higher mode, a dispersion compensation section capable of, with respect to the light of higher mode outputted from said first mode light conversion section, compensating a chromatic dispersion corresponding to the status of mode of said light of higher mode, a second mode light conversion section capable of, with respect to the light of higher mode dispersion-compensated in said dispersion compensation section, converting into light of original mode, and a mode control section capable of variably controlling the status of mode of the light of higher mode converted in said first mode light conversion section, and controlling to convert the light of higher mode from said dispersion compensation section to the light of original mode in said second mode light conversion section, wherein said first mode light conversion section is configured so as to convert light of basic mode outputted from a single mode fiber at an input side into the light of higher mode, said second mode light conversion section is configured so as to convert the light of higher mode dispersion-compensated in said dispersion compensation section into the light of basic mode and output the same to the single mode fiber at an output side, and the dispersion compensation device further comprising a first collimate lens interposed between said single mode fiber at the input side and said first mode light conversion section, a second collimate lens interposed between said first mode light conversion section and said dispersion compensation section, a third collimate lens interposed between said dispersion compensation section and said second mode light conversion section, and a fourth collimate lens interposed between said second mode light conversion section and said single mode fiber at the output side.