Patent ID: 7218818
Filing Date: 2007-05-15
Classification: H04B

Abstract:
1. A dispersion compensation device which compensates wavelength dispersion of input light signal and outputs compensated light signal, comprising: an optical circulator which has a first, a second and a third ports, outputs input optical signal from the first port to the second port and outputs input optical signal from the second port to the third port; a first and a second dispersion compensation units, including: a control unit which controls said optical path setting units of the first and second dispersion compensation units; and wherein the other end of the dispersion compensating fiber of the first dispersion compensation unit connects to the second port of the optical circulator, wherein the other end of the dispersion compensating fiber of the second dispersion compensation unit connects to the second input/output port of the optical path setting unit of the first dispersion compensation unit, wherein in case said control unit controls to connect the first input/output port and the third input/output port of the optical path setting unit of the first dispersion compensation unit, said optical reflecting unit of the first dispersion compensation unit reflects optical signal and an optical signal input to the optical circulator is dispersion compensated by the dispersion compensating fiber of the first dispersion compensation unit and is output from the third port of the optical circulator, and wherein in case said control unit controls to connect the first input/output port and the second input/output port of the optical path setting unit of the first dispersion compensation unit and controls to connect the first input/output port and the third input/output port of the optical path setting unit of the second dispersion compensation unit, said optical reflecting unit of the second dispersion compensation unit reflects optical signal and an optical signal input to the optical circulator is dispersion compensated by the dispersion compensating fibers of the first and second dispersion compensation units and is output from the third port of the optical circulator.